Download Forces Review

Name ____________________________ Date ___________ Period ___ Newton’s Laws Review
1.
Which of the following force diagrams shows the greatest unbalanced force?
a)
b)
c)
d)
2.
Which of the following choices will have the greatest acceleration?
a)
A 5 kg pumpkin pushed by a 50 N force
b)
A 5 kg pumpkin pushed by a 10 N force
c)
A 10 kg pumpkin pushed by a 50 N force
d)
A 10 kg pumpkin pushed by a 10 N force
3.
Which of the following choices helped you decide the answer for the question above?
a)
I used Newton’s first law to solve the problem
b)
I used Newton’s second law to solve the problem
c)
I multiplied the numbers
d)
I saw which numbers are the greatest
4.
Jimmy was riding in an airplane that was preparing to take off on a runway. Jimmy’s coffee
that was sitting on the table in front spilled for no apparent reason when the plane went
faster on the runway. Which of the following reasons best explains why the coffee may
have spilled?
a)
An object at rest continues to stay at rest, so when the cup moved, the coffee
stayed where it was.
b)
An object in motion continues to be in motion, so when the coffee was moving, it
spilled.
c)
The coffee was under a spell.
d)
Jimmy’s neighbor spilled it.
5.
The mass of a 50 kg box will be greatest on
a)
Earth
b)
Moon
c)
Jupiter
d)
None of the above. It will be the same in all places
6.
1 Newton is the force required to
a)
Move a 1 kg object at 1 m/s
b)
Move a 1 kg object in 1 second
c)
Accelerate a 1 kg object at 1 m/s/s
d)
Accelerate a 1 kg object at 1m
7.
The force that the Earth exerts on a house is also known as the house’s
a)
Inertia
b)
Mass
c)
Weight
d)
Gravity
8.
A crane lifting up a 2,000 kg container exerts a 30,000 N force on the container. What
would be the container’s acceleration?
a) About 1.5 m/s2
b) About 15 m/s2
c) About 60,000 m/s2
d) None of the above
9.
If the same crane exerts the same force on a 2,500 kg car while lifting it up, how will the
acceleration of the car in this question compare to the acceleration of the container in
question 5?
a)
It will be more
b)
It will be less
c)
It will be the same
10.
Which of the following is the correct representation of the force arrow that is pointing
upwards in the following force diagram?
a)
F ball on Earth
b)
F ball
c)
F Earth on ball
d)
F hand on ball
Earth
11.
12.
a)
b)
c)
d)
A toy car is moving with a constant velocity of 4 inches / second. Which of the following
motion diagrams best represents the motion of this car?
e)
f)
g)
h)
What is the acceleration of the car in the previous question?
4 in/s/s
0 in/s/s
0 in
4 in
13.
How did you decide your answer for the question above?
a)
Based on Newton’s second Law
b)
By seeing the change in velocity
c)
By assuming that the constant velocity force was present
d)
None of the above
14.
According to Newton’s second law
a)
Acceleration increases as mass increases
b)
Acceleration decreases as mass increases
c)
Acceleration increases as force increases
d)
Acceleration decreases as force increases
15.
Mass is related to an object’s
a)
Weight
b)
Inertia
c)
Density
d)
All of the above
16.
A force is
a)
A vector quantity
b)
Always producing motion
c)
Capable of producing change in motion
d)
Both (a) and (c)
17.
True or False (Neglect air in all questions below; all situations are on Earth)
18.
a)
The system or the object of interest can exert a force on itself
b)
A turkey leg sitting on a plate is being pushed or pulled by 2 external objects
c)
An elevator hanging from a cable is being pushed or pulled by only one external
object
d)
A toy car moving with a slow constant velocity has a very small acceleration
An object weighs 300 N on Earth and 50 N on the Moon. Does the object also have less
inertia on Moon?
19.
Determine the unbalanced force or the net force exerted on the object and the
acceleration of the object in the following problems. Write both magnitude and direction of the
acceleration. Show all of your work.
5kg
Unbalanced Force:
60 N
Mass:
43 N
Acceleration:
66 N
5kg
Unbalanced Force:
76 N
Mass:
Acceleration:
Unbalanced Force:
22 N
5kg
Mass:
Acceleration:
20.
An unbalanced force of 4.0 N gives an object an acceleration of 10 m/s/s. What is the mass
of the object?
Looking for:
Solution:
Given:
Equation:
21.
Sasha exerts a 6 N force on a 6 kg box. What is the box’s acceleration?
Looking for:
Given:
Equation:
Solution:
22.
A rocket ship coasting (or moving with constant velocity) in space, fires its engine. The
engine provides a 500N thrust (or push) to the rocket ship. This makes the rocket
accelerate at 3 m/s2. What is the mass of the rocket?
Looking for:
Solution:
Given:
Equation:
23.
What is the weight of a 50 kg person on Earth in Newtons?
Looking for:
Solution:
Given:
Equation:
24.
If an astronaut weighs 600 Newtons on Earth, what is the astronaut’s weight in outer space
(far from any planet, etc.)? What is the astronaut’s mass in outer space?
Looking for:
Given:
Equation:
Solution: