Happy
Monday!
• Turn-in homework.
• Today: We will practice more
acceleration problems
• HW: pg. 83-84: 20, 21, 25, 28,
29, 33, 39, 40
Sample
𝑣𝑓 − 𝑣𝑜
𝑎=
𝑡
1 2
∆𝑥 = 𝑎𝑡 + 𝑣𝑜 𝑡
2
2𝑎∆𝑥 = 𝑣𝑓2 − 𝑣𝑜2
• An Indy-500 race car's velocity
increases from 4.00 m/sec to 36.0
m/sec over an interval lasting 4.00
seconds. What is the car’s average
acceleration? How far does the car
travel?
Sample
• A golf ball rolls up a hill towards a puttputt hole. It leaves the club traveling
+2.0 m/sec and experiences an
acceleration of - 0.50 m/sec2. What will
be its velocity after 3 seconds? 5
seconds? What happens between 3 and
5 seconds?
Sample
• An airplane while in flight, accelerates
from a velocity of 21.0 m/sec at a
constant rate of 3.00 m/sec2 over a
total of 535 meters. Determine the final
cruising velocity of the plane.
Sample
• Statistically, a person wearing a
shoulder harness can survive a car
crash if the acceleration is smaller than
-300. m/sec2. Assuming a constant
acceleration, how far could the front
end of a car collapse if the car impacts
while going 28.0 m/sec and comes to
a complete stop?
It’s
Tuesday!
• Turn in yesterday’s worksheet and
HW
• Today: Acceleration and Motion
Graphs
• HW: Graphs WS
• STEM Club Meeting is on
THURSDAY after school in room
117
• I’ll be in room 117 office at lunch
today.
Warm-Up
• If a bullet leaves the muzzle of a rifle
with a speed of 600. m/sec, and the
barrel of the rifle is 0.900 meters long,
what is the acceleration of the bullet
while in the barrel?
Acceleration
Time
Graphs
Acceleration
Time
Graphs
• The slope is zero  constant
acceleration
• Area beneath an accelerationtime graph:
𝑚
𝑠2
𝑠 = 𝑚/𝑠 the unit for
velocity
– The area represents the change
in velocity (∆𝒗)
Sample
• What is the cart’s initial velocity?
• What is the cart’s initial position?
• How much did the cart’s velocity change from 2 to 14
seconds?
• What is the cart’s velocity at 14 seconds?
• How fast was the cart traveling at 8 seconds?
• How far did the cart travel between 2 and 14 seconds?
• What is the cart’s final position at 14 seconds?
Sample
• What was the average acceleration of the car
between 0 and 10 seconds?
• What was the average acceleration of the car
between 10 and 15 seconds?
• What was the average acceleration of the car
between 15 and 40 seconds?
• What was the average acceleration of the can
between 40 and 55 seconds?
• Sketch an acceleration vs. time graph for the
car.
One Day
Until
Friday!
Note:
• Stem Club Meeting today after
school in room 117.
• WebAssign HW will not show up
until Friday… so it’s due Monday at
11:59 pm
• Agenda:
–Book Notes
–Annotate Class Notes
–Go over homework together… you
have to get this! I will collect this
tomorrow.
• Tomorrow:
–Quiz
–POTW is Due
–Bowling Ball Lab on Monday
Book Notes
and
Annotation
You need to review:
1. Get a yellow Physics Book
2. Starting on pg. 10, read the following
section and take notes:
a)Speed (2.2)
b)Velocity (2.3)
c)Acceleration (2.4)
3. Get your class notes out and with your
shoulder partner:
a)Review each section
b)Annotate and write a summary for each
topic
SAMPLE
PROBLEMS
Sample
An airplane travels 280 m down the
runway before taking off. If it starts from
rest and becomes airborne in 8.0 sec,
how fast is it moving at takeoff assuming
a constant acceleration?
Sample
Sample
Starting from rest, a boulder rolls down a
hill with constant acceleration and travels
2 m during the first second. How far
does it travel during the 2nd second?
Sample
Sample
A fugitive tries to hop on a freight train
traveling at a constant speed of 6 m/sec.
Just as an empty box car passes him, the
fugitive starts from rest and accelerates
at 4 m/sec2 to his maximum speed of 8
m/sec. How long does it take him to
catch up to the empty box car?
Sample