Motion and Forces Study Guide
Learning Target
I can describe the
mathematical
relationship of
Newton’s 2nd Law
(F=ma)
I can design a
motion graph of a
given situation.
I can analyze data
to see if it supports
Newton’s 2nd Law
of Motion, F=ma.
*ANSWER ON YOUR OWN PAPER!!!
Review Questions
1. State newton’s 2 Law.
Force on a mass can cause it to accelerate.
2. If mass increases, then force acting on the object ___
increases.
3. If force increases, then acceleration increase .
4. If acceleration decreases, then mass slows down.
5. A truck with a mass of 2,000 kg is traveling at a constant
velocity of 40 m/s. What is the net force acting upon the
truck? F=ma F=2,000kg (
)=
6. For #5- copy this table on your own paper, then fill in with
correct answers. Write a story for #10 here:
Story Graph Data Set
#
1
g
p
2
d
q
3
f
r
4
c
v
5
a
w
6
e
t
7
i
u
8
h
z
9
j
x
10
b
s
For #7 through #13, write down if the data supports Newton’s 2nd Law
and why.
Force Mass Acceleration Does Data
Reason
2
(N)
(kg)
(m/s )
Meet
Calculate
Newton’s
2nd Law?
7.
2
5
0.4
Yes/ No
8.
6
8
0.75
Yes/ No
9. 12.5
12.5
1
Yes/ No
10. 172
63
2.73
Yes/ No
11. 57
4.75
12
Yes/ No
12. 67.408
2.2
30.64
Yes/ No
13. 163.46 83.4
1.96
Yes/ No
nd
I can calculate
momentum.
I can describe the
mathematical
relationship of
Newton’s 3
Action/Reaction
(momentum) p=mv.
I can describe
Newton’s law of
Gravitation.
14.
Calculate the momentum of a 65 kg skateboarder
moving forward at the rate of 3 m/s.
P=mv = 65kg x 3m/s = 195 kgm/s
15.
Calculate the momentum of a 20 kg toddler in a car
traveling west at the rate of 22 m/s.
P=mv = 20 kg x 22 m/s = 440 m/s
16.
Superman is often shown throwing huge objects
(such as a bus), while he stays completely still. Why does
this not support Newton’s 3rd Law and Conservation of
Momentum? Still is V=0m/s Law of conservation says all
momentum is conserved so there has to be a reaction(mv)
to the action(mv) and their isn’t.
p=p
mv= mv
rd
17.
State Newton’s 3 Law. For every action there is an
equal and opposite reaction.
18.
When a long jumper jumps, Earth exerts a force that
moves him/ her upward and to the east. Since there is a
reaction force exerted on Earth, why doesn’t Earth move
the same distance down and to the west?
Earth is more massive.
19.
When a bowling ball hits the pins at the end of the
bowling alley, what happens to the balls momentum?
The momentum is transferred into the pins.
20.
What is Newton’s Law of Universal Gravitation?
F=G m1m2
d2
21.
The force of gravity between two objects depends
on what 2 factors? Mass and distance apart
22.
True or False… Gravity is the pull of an object
towards the center of the Earth.
23.
If you went to the moon and dropped a feather and a
hammer at the same time, which would land first?
Neither, they would hit at the same time
Why? Moon’s gravity is so much less, therefor less
atmospheric pressure and less air resistance to cause
friction between the objects.
24.
If you drop a bullet at the same time one is fired
straight outward from the same height, which bullet will hit
the ground first? Since they are dropped from the same
gravitational Potential energy height, they hit at the same
time. Why? All objects on Earth are attracted at the same
acceleration rate of 9.8m/s2
I can predict the
gravitational force
between two objects
using Newton’s Law
of Gravitation.
25.
The force between a planet and a spacecraft is 1
million Newton’s. If the spacecraft moves to half of its
original distance from the center of the planet, what will its
force be?
F=G m1m2 1,ooo,oooNewtons of Force=planet 1 (2)
D2
52
(Cross multiply)
F= 1,000,000N x .25 = 250,000N
26.
The planet Mercury is less massive than Earth. Your
mass on Mercury would be less than/ greater than/ equal
to your mass on Earth. Mass stays the same
27.
Your weight on Mercury would be less than/ greater
than/ equal to your mass on Earth.
Weight=mass x gravity Mercury’s gravity is less than
Earth’s so your weight will be less.