1/4 – Objective: Investigate and calculate quantities using the work-energy theorem in various
situations (TEKS P6a – R) ; Investigate examples of kinetic and potential energy and their
transformations (TEKS P6b – R)
We will discuss & write down the equation of Work & Power.
At the end of class, you will be able to identify and calculate Work and Power in terms of Force, distance and
time.
Discuss Work & Power
HW: WS # 1-7 & UT QUEST OPENS 1/9
Work Examples
A sled, which has a mass of 45.0 kg., is sitting on
a horizontal surface. A force of 120 N is applied
to a rope attached to the front of the sled such
that the angle between the front of the sled and
the horizontal is 35⁰. As a result of the
application of this force the sled is pulled a
distance of 500 meters at a relatively constant
speed. How much work was done to this sled by
the applied force?
Example
Big Joe pulls a 300 N sled across level
snow with a force of 520 N along a rope
that is q above the horizontal. If the sled
moves a distance of 60 m, and Joe does
20kJ of work, what is q?
Work Example 2
A 75 kg crate is moved across a
floor, against friction, at a
constant speed. It moves a
distance of 41 m, and 18kJ of
work is done on it. What is the
coefficient of friction?
Example of Power
What power is consumed in lifting a
70-kg robber 1.6 m in 0.50 s?
Fh mgh
P

t
t
2
(70 kg)(9.8 m/s )(1.6 m)
P
0.50 s
Power Consumed: P = 2220 W
1/5 – Objective: Investigate and calculate quantities using the work-energy theorem in various
situations (TEKS P6a – R) ; Investigate examples of kinetic and potential energy and their
transformations (TEKS P6b – R)
We will discuss write down the equation for Kinetic Energy.
At the end of class, you will be able to distinguish between Work and Kinetic energy. We should also be able
to identify the relationship between Work and Energy.
Finish Discussion of Work & Power
Discuss Work-Kinetic Energy Theorem
HW: WS #1-15, UT QUEST OPENS 1/9
1/6 – Objective: Investigate and calculate quantities using the work-energy theorem in various
situations (TEKS P6a – R) ; Investigate examples of kinetic and potential energy and their
transformations (TEKS P6b – R)
We will discuss write down the equation for Kinetic Energy.
At the end of class, you will be able to distinguish between Work and Kinetic energy. We should also be able
to identify the relationship between Work and Energy.
Work Problems/HW Check
HW: WS #1-15, UT QUEST OPENS 1/9
How fast must a 4.40 kg bowling ball
move in order to have a kinetic energy
of 185 Joules?
Work/KE example
A 75 kg bobsled is pushed along a
horizontal surface. After the sled
is displaced 4.5 m starting from
rest, its speed is 6.0 m/s. Find the
net force on the bobsled.
• A 13.0 g bullet is accelerated from
rest to a speed of 700 m/s as it
travels 22.0 cm in a gun barrel.
What was the force exerted on the
bullet while in the barrel?
1/7 – Objective: Investigate and calculate quantities using the work-energy theorem in various
situations (TEKS P6a – R) ; Investigate examples of kinetic and potential energy and their
transformations (TEKS P6b – R)
We will discuss write down the equation for Gravitational Potential Energy and tie in Conservation of Energy
(COE).
At the end of class, you will be able to distinguish between GPE and KE. We should also be able to identify
the relationship between GPE & KE using the law of COE.
Discuss Gravitational Potential Energy &
Conservation of Energy
HW: WS 1–22
Energy
A skier starts from rest and coasts
down a hill with a vertical
displacement of 120 m. The hill is
inclined at 30o. Neglecting friction,
how fast is the skier going at the
bottom of the hill?
1/8 – Objective: Investigate and calculate quantities using the work-energy theorem in various
situations (TEKS P6a – R) ; Investigate examples of kinetic and potential energy and their
transformations (TEKS P6b – R)
We will discuss write down the equation for Gravitational Potential Energy and tie in Conservation of Energy
(COE) applying frictional forces.
At the end of class, you will be able to distinguish between GPE and KE. We should also be able to identify
the relationship between GPE & KE using the law of COE applying frictional forces.
Discuss Conservation of Energy & Friction
Intro Lab: Vertical Loop (Google)
HW: WS 1–22, Quiz 1/14, Test 1/25
UT Quest Opens Tomorrow
1/11 – Objective: Investigate and calculate quantities using the work-energy theorem in various
situations (TEKS P6a – R) ; Investigate examples of kinetic and potential energy and their
transformations (TEKS P6b – R)
We will discuss write down the equation for Gravitational Potential Energy and tie in Conservation of Energy
(COE) applying frictional forces.
At the end of class, you will be able to distinguish between GPE and KE. We should also be able to identify
the relationship between GPE & KE using the law of COE applying frictional forces.
Lab: Vertical Loop (Google)
HW: WS 1–22, Quiz 1/14, Test 1/25
1/12 – Objective: Investigate and calculate quantities using the work-energy theorem in various
situations (TEKS P6a – R) ; Investigate examples of kinetic and potential energy and their
transformations (TEKS P6b – R)
We will discuss write down the equation for Gravitational Potential Energy and tie in Conservation of Energy
(COE) applying frictional forces.
At the end of class, you will be able to distinguish between GPE and KE. We should also be able to identify
the relationship between GPE & KE using the law of COE applying frictional forces.
Discuss Work & Friction
Discuss Lab: Vertical Loop (Google)
HW: WS 1–22, Quiz 1/14, Test 1/25
Conservation of Energy
You begin your slide down the end of
a Super Slide from rest. At the
bottom, you have a speed of 15.8 m/s.
How tall is the slide?
If you reach the bottom of the hill at
12 m/s, how much work was done by
friction? Mass = 50kg
1/13 – Objective: Investigate and calculate quantities using the work-energy theorem in various
situations (TEKS P6a – R) ; Investigate examples of kinetic and potential energy and their
transformations (TEKS P6b – R)
We will discuss write down the equation for Gravitational Potential Energy and tie in Conservation of Energy
(COE) applying frictional forces.
At the end of class, you will be able to distinguish between GPE and KE. We should also be able to identify
the relationship between GPE & KE using the law of COE applying frictional forces.
Complete Lab: Vertical Loop (Google)
HW: WS 1–22, Quiz Tomorrow, Test 1/25
1/14 – Objective: Investigate and calculate quantities using the work-energy theorem in various
situations (TEKS P6a – R) ; Investigate examples of kinetic and potential energy and their
transformations (TEKS P6b – R)
We will take an assessment on COE
At the end of class, you will be able to distinguish between GPE and KE. We should also be able to identify
the relationship between GPE & KE using the law of COE applying frictional forces.
Quiz: COE
HW: WS 1–22, Test 1/25
1/15 – Objective: Investigate and calculate quantities using the work-energy theorem in various
situations (TEKS P6a – R) ; Investigate examples of kinetic and potential energy and their
transformations (TEKS P6b – R)
We will discuss/write down the equation for energy of a spring.
At the end of class, you will be able to calculate the work done by a spring.
Review Energy
Discuss Springs
Intro Spring Gizmo
HW: Springs WS 1–5, Test 1/25
1/19 – Objective: Investigate and calculate quantities using the work-energy theorem in various
situations (TEKS P6a – R) ; Investigate examples of kinetic and potential energy and their
transformations (TEKS P6b – R)
We will discuss write down the equation for energy of a spring.
At the end of class, you will be able to calculate the work done by a spring.
Gizmo Lab: Springs
HW: Springs WS 1–5, Test 1/25
1/20 – Objective: Investigate and calculate quantities using the work-energy theorem in various
situations (TEKS P6a – R) ; Investigate examples of kinetic and potential energy and their
transformations (TEKS P6b – R)
We will finish lab and work on UT Quest.
At the end of class, you will be able to calculate the work done by a spring.
Complete and Turn In Lab: Springs
Independent Study
HW: Springs WS 1–5
UT Quest Tomorrow, Test 1/25
1/21 – Objective: Investigate and calculate quantities using the work-energy theorem in various
situations (TEKS P6a – R) ; Investigate examples of kinetic and potential energy and their
transformations (TEKS P6b – R)
We will calculate different forms of energy.
At the end of class, you will be able to calculate different forms of energy.
Review Work & Energy
HW: MC Review, Test 1/25
Conservation of Energy
You begin your slide down the end of
a Super Slide with a speed of 2.4 m/s.
At the bottom, you have a speed of
15.8 m/s. How tall is the slide?
Conservation of Energy
You begin to slide your 120 kg pet cat
down a 100 m high mountain with a
speed of 5 m/s. About 4 m from the
bottom, you have lost approximately
20 kJ of energy due to work done by
friction. What is your final speed at
this moment?
1/22 – Objective: Investigate and calculate quantities using the work-energy theorem in various
situations (TEKS P6a – R) ; Investigate examples of kinetic and potential energy and their
transformations (TEKS P6b – R)
We will review concepts related to Work & Energy
At the end of class, you will be able to review concepts related to Work & Energy
Review: Work & Energy
HW: MC Review, Test Monday
1/25 – Objective: Investigate and calculate quantities using the work-energy theorem in various
situations (TEKS P6a – R) ; Investigate examples of kinetic and potential energy and their
transformations (TEKS P6b – R)
We will review concepts related to Work & Energy
At the end of class, you will be able to review concepts related to Work & Energy
Test: Work & Energy
HW: None
1/26 – Objective: Calculate the mechanical energy of, power generated within, impulse applied
to, and momentum of a physical system (TEKS P6c – R); demonstrate and apply the laws of
conservation of energy and conservation of momentum in one dimension (TEKS P6d – R)
We will discuss & write down the equation of Momentum & Impulse.
At the end of class, you will be able to identify and calculate Momentum & Impulse in terms of Force,
velocity and time.
Discuss Impulse & Momentum
Throw Balloons
HW: WS # 1-5 & UT QUEST OPENS 1/30
Impulse
Crash Test Debbie has a mass
of 60 kg, and is riding in a car
at 25 m/s. She is wearing her
seatbelt, which brings her body
to a stop in 0.40 sec. What is
the average force on CTD?
Impulse
A 0.145 kg baseball pitched is hit on a
horizontal line drive straight back toward the
pitcher at 52.0 m/s. If the contact time
between the bat and the ball is 1.0 x 10-3 s, and
the average force on the ball is 13kN, what was
the initial speed of the ball?
A baseball (m = 150 g) approaches a bat
horizontally at a speed of 39.8 m/s (89.0 mph).
What is the initial momentum of the ball?
If it is hit straight back at a speed of 48.8 m/s
(109 mph), and the ball is in contact with the
bat for a time of 1.03 ms, what is the average
force on the ball?
1/27 – Objective: Calculate the mechanical energy of, power generated within, impulse applied
to, and momentum of a physical system (TEKS P6c – R); demonstrate and apply the laws of
conservation of energy and conservation of momentum in one dimension (TEKS P6d – R)
We will discuss the concept of Conservation of Momentum.
At the end of class, you will be able to formulate and calculate situations that involve In-Elastic/Elastic
Collisions.
Intro COM
Lab Simulation (Due in class)
HW: WS # 1-5 & UT QUEST OPENS 1/30
1/28 – Objective: Calculate the mechanical energy of, power generated within, impulse applied
to, and momentum of a physical system (TEKS P6c – R); demonstrate and apply the laws of
conservation of energy and conservation of momentum in one dimension (TEKS P6d – R)
We will discuss the concept for Conservation of Momentum.
At the end of class, you will be able to formulate and calculate situations that involve In-Elastic Collisions.
Discuss COM
&
In-Elastic Collisions
HW: WS # 1-10 & UT QUEST OPENS 1/30
Running at 2.0 m/s, Bruce, the 45
kg quarterback, collides with Biff,
the 90 kg tackle, who is traveling at
7.0 m/s in the other direction.
Upon collision, Biff continues to
travel forward at 1.0 m/s. What is
Bruce’s final velocity?
EXAMPLE PROBLEM
WESTON A 65 KG SKIN DIVER, SHOOTS A 2 KG SPEAR WITH A VELOCITY
OF 15 M/S AT A FISH WHO DARTS AWAY QUICKLY WITHOUT GETTING
HIT. HOW FAST DOES WESTON MOVE BACKWARDS WHEN THE SPEAR
IS SHOT?
A bullet of mass 100 g is fired horizontally
into a 14.9 kg block resting on a horizontal
surface, and the bullet becomes imbedded
in the block. If the speed of the bullet is
250 m/s, what is the velocity of the block
containing the bullet immediately after the
impact?
Inelastic
A rail car full of Cats-Up has a mass of 1600 kg.
It is rolling with a speed of 2.5 m/s when it
collides and joins with a resting 3200 kg rail car
full of “chicken nuggets”. What is the train’s
speed immediately after the collision? How
much kinetic energy is lost in the collision?
A bullet of mass 100 g is fired horizontally
into a 14.9 kg block resting on a horizontal
surface, and the bullet becomes imbedded
in the block. If the speed of the bullet is
250 m/s, what is the velocity of the block
containing the bullet immediately after the
impact?
Inelastic
A rail car full of honey mustard has a mass of
1600 kg. It is rolling with a speed of 2.5 m/s
when it collides and joins with a resting 3200
kg rail car full of “chicken nuggets”. What is
the train’s speed immediately after the
collision? How much kinetic energy is lost in
the collision?
A(n)
, which has a mass of 6.0 kg, is
moving to the right with a velocity of 8.0 m/s
when it collides with a second
of
12.0 kg which is initially at rest. After the
collision the 12.0 kg
moves off to the
right with a new velocity of 5.33 m/s.
a. What will be the final velocity of the 6.0 kg
?
b. Is this collision elastic? How do you know?
Support your answer with evidence!
Two Dimensional Example One
A truck and a car collide inelastically at
an intersection. The truck (m = 700 kg) is
moving north at a speed of 12 m/s. The
car (m = 425 kg) is moving east at a speed
of 18 m/s. What is the magnitude and
direction of their resulting velocity?
1/29 – Objective: Calculate the mechanical energy of, power generated within, impulse applied
to, and momentum of a physical system (TEKS P6c – R); demonstrate and apply the laws of
conservation of energy and conservation of momentum in one dimension (TEKS P6d – R)
We will discuss & write down the equation for Conservation of Momentum.
At the end of class, you will be able to identify and calculate situations that involve Elastic Collisions.
Check Out Energy Test
Discuss Elastic Collisions
WS # 1-17, Quiz Wednesday
2/1 – Objective: Calculate the mechanical energy of, power generated within, impulse applied
to, and momentum of a physical system (TEKS P6c – R); demonstrate and apply the laws of
conservation of energy and conservation of momentum in one dimension (TEKS P6d – R)
We will discuss & write down the equation for Conservation of Momentum.
At the end of class, you will be able to identify and calculate situations that involve Elastic Collisions.
Review WS Questions
Discuss Elastic Collisions
UT Quest Open
WS # 1-17, Quiz Wednesday
2/2 – Objective: Calculate the mechanical energy of, power generated within, impulse applied
to, and momentum of a physical system (TEKS P6c – R); demonstrate and apply the laws of
conservation of energy and conservation of momentum in one dimension (TEKS P6d – R)
We will run inelastic and elastic collisions on tracks.
At the end of class, you will be able to identify and calculate the mass of one of the cars in both types of
collisions.
Lab COM Collisions
WS # 1-17, Quiz Wednesday
2/3 – Objective: Calculate the mechanical energy of, power generated within, impulse applied
to, and momentum of a physical system (TEKS P6c – R); demonstrate and apply the laws of
conservation of energy and conservation of momentum in one dimension (TEKS P6d – R)
We will run inelastic and elastic collisions on tracks.
At the end of class, you will be able to identify and calculate the mass of one of the cars in both types of
collisions
Lab COM Collisions
WS # 1-17, Quiz Tomorrow
2/4 – Objective: Calculate the mechanical energy of, power generated within, impulse applied
to, and momentum of a physical system (TEKS P6c – R); demonstrate and apply the laws of
conservation of energy and conservation of momentum in one dimension (TEKS P6d – R)
We will discuss & write down the equation for Conservation of Momentum.
At the end of class, you will be able to identify and calculate situations that involve Elastic Collisions.
Quiz: COM
WS # 1-17, UT Quest
2/5 – Objective: Calculate the mechanical energy of, power generated within, impulse applied
to, and momentum of a physical system (TEKS P6c – R); demonstrate and apply the laws of
conservation of energy and conservation of momentum in one dimension (TEKS P6d – R)
We will discuss & write down the equation for Conservation of Momentum.
At the end of class, you will be able to identify and calculate situations that involve Elastic Collisions.
Review 15 minutes
Quiz: COM
WS # 1-17, UT Quest (2/6) – Test 2/9
The Ballistic Pendulum
A 10 g bullet is fired horizontally into, and
becomes imbedded in, a block of wood
(m=0.89 kg) suspended by a string. The
block (with the bullet in it) is vertically
displaced 0.40 m in the collision. What
was the initial speed of the bullet?
Collision Quiz/Warm Up
A 15 g bullet moving at 300
m/s imbeds itself in a 325 g
can resting on a fence.
What is the final speed of
the bullet & can? How
much energy was lost as a
result of the collision?
2/6 – Objective: Calculate the mechanical energy of, power generated within, impulse applied
to, and momentum of a physical system (TEKS P6c – R); demonstrate and apply the laws of
conservation of energy and conservation of momentum in one dimension (TEKS P6d – R)
We will discuss & write down the equation for Conservation of Momentum.
At the end of class, you will be able to identify and calculate situations that involve Elastic Collisions.
MC Review
WS # 1-17 – Test 2/9
2/9 – Objective: Calculate the mechanical energy of, power generated within, impulse applied
to, and momentum of a physical system (TEKS P6c – R); demonstrate and apply the laws of
conservation of energy and conservation of momentum in one dimension (TEKS P6d – R)
We will discuss & write down the equation for Conservation of Momentum.
At the end of class, you will be able to identify and calculate situations that involve Elastic Collisions.
MC Review
Review Quiz & Lab
WS # 1-17 – Test 2/11
2/10 – Objective: Demonstrate and apply the laws of conservation of energy and conservation
of momentum in one dimension (TEKS P6d – R); describe and calculate non-accelerated motion
with reference to Pendulums and Torque; examples include statics (transitional & rotational
equilibrium – Simple Harmonic Motion) (TEKS P4c– R)
We will discuss & write down the equation for Pendulum’s.
At the end of class, you will be able to identify and calculate the period of a pendulum.
Pendulum’s & Ballistic Pendulum’s
HW: WS 1-4
Torque Example
A seesaw is 4.5 m across, and is pivoted in the
middle. You have a mass of 50 kg and sit 1.0 m
from the left end of the seesaw. Your buddy
wants to play, and he sits 3.8 m from the left
end. How big (in kg) is your buddy if you
balance?
A pair of adult nitwits sit balanced on a teeter
totter type device. One of them, who’s mass is
45.2 kg, is 1.30 m from the point of balance
(assumed to be at the center of the teeter
totter). The other chowder-head is 2.15 m from
the point of balance. What is the mass of the
second person? If it is translational equilibrium,
what is the force exerted by the fulcrum?
2/11 – Objective: Calculate the mechanical energy of, power generated within, impulse applied
to, and momentum of a physical system (TEKS P6c – R); demonstrate and apply the laws of
conservation of energy and conservation of momentum in one dimension (TEKS P6d – R)
We will discuss & write down the equation for Conservation of Momentum.
At the end of class, you will be able to identify and calculate situations that involve Elastic Collisions.
Test: Momentum
HW: None