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Chapter 2 Test Study Guide
The Laws of Motion
1. What is a force? Give an example. Push or pull; pushing the door open
2. Give 2 examples of noncontact forces. Magnetism, gravity
3. An arrow can be used to represent a force. The length of the arrow
represents strength of force.
4. Forces that are equal in size but opposite in direction are balanced.
5. Unbalanced forces can make an object accelerate by changing speed or
direction.
6. An unbalanced force creates motion.
7. Give an example of an unbalanced force. Tug of war and one side is
stronger than the other.
8. What is the force that opposed motion? friction
9. The force you have to overcome to start an object moving is static friction.
10. The upward force on an object falling through the air is air resistance.
11.
The relationship among force, mass, and acceleration is stated in
Newton’s 2nd law of motion.
12. What force keeps a satellite in orbit? Centripetal force.
13. The statement “for every action there is an equal but opposite reaction” is a
statement of Newton’s 3rd law of motion.
14. Whenever an object exerts a force on another object, the second object exerts
a force of the same magnitude, but in the opposite direction to that of the
first object.
15. An object of a large mass has more momentum than an object of small mass.
16.
Give an example illustrating Newton’s 1st Law of Motion. Moving a
stationary object or when traveling on a train and the train stops, you
move forward.
17.
Give an example illustrating Newton’s 2nd Law of Motion. Increasing
force, you move faster.
18.
Give an example illustrating Newton’s 3rd Law of Motion. Jumping on
a trampoline or a rocket lift off.
Calculations.
19. A net force pushing a 15-kg wagon on a level road results in acceleration of 2
m/s2.What is the net force?
Force = mass x acceleration
Force = 15 kg x of 2 m/s2
Force = 30 N
20. What is the formula to calculate weight? An ice skater has a mass 60 kg, what
is her weight?
Force = mass x 9.8 m/s2
Force = 60kg x 9.8 m/s2
Force = 588 N
21. A boy throws a 1-kg rock with a force of 5 N. What is the acceleration of the
rock when he lets go of it?
Acceleration = Net Force ÷ Mass
Acceleration = 5N ÷ 1kg
Acceleration = 5 m/s2
22. If a 6-kg bowling ball is rolled down the bowling lane with a velocity of 3.5
m/s, what is the momentum of the ball?
Momentum = mass x velocity
Momentum = 6kg x 3.5 m/s
Momentum = 21 kg x m/s
23.
10 m/s
5 m/s
5 m/s
10 m/s
24.
10 m/s
0 m/s
0 m/s
10 m/s
20 m/s
0 m/s
25.
10m/s_
-
10m/s
Extended Constructed Response Questions
1. How does the mass and surface area of an object affect its air
resistance?
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2. Use Newton’s third law to describe how a bird flies. Come up with your
own example of an action-reaction pair and identify which is the action
force and which is the reaction force.
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3. How does Newton’s first law explain what happens to passengers when
a car stops quickly? (Make sure you state Newton’s 1st Law)
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