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These results are not forwarded to Mr. Morrison.  Use this as a study guide to help you understand the Newton's Laws Practice Exam 2

Newton'sLaws - StudyGuidePart2



Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

A tennis ball and a solid steel ball with the same diameter are dropped at the same time. Which ball has the greater force acting on it?
a.
The steel ball
b.
The tennis ball
c.
They both have the same force acting on them.
 

 2. 

A tennis ball and a solid steel ball with the same diameter are dropped at the same time. In the absence of air resistance, which ball has the greater acceleration?
a.
The steel ball
b.
The tennis ball
c.
They both have the same acceleration.
 

 3. 

The reason a tennis ball and a solid steel ball will accelerate at the same rate, in the absence of air resistance, is that
a.
they have the same mass.
b.
the ball with the larger force has the smaller mass.
c.
the ball with the larger force also has the larger mass.
d.
the force acting on them is the same.
e.
none of the above
 

 4. 

As a care package falls from a high-flying stationary helicopter, its velocity increases and its acceleration
a.
remains the same.
b.
decreases.
c.
increases.
 

 5. 

If the force acting on a cart doubles, what happens to the cart's acceleration?
a.
It quarters.
b.
It halves.
c.
It stays the same.
d.
It doubles.
e.
It quadruples.
 

 6. 

Suppose a cart is being moved by a force. If suddenly a load is dumped into the cart so that the cart's mass doubles, what happens to the cart's acceleration?
a.
It quarters.
b.
It halves.
c.
It stays the same.
d.
It doubles.
e.
It quadruples.
 

 7. 

A 20-N falling object encounters 4 N of air resistance. The magnitude of the net force on the object is
a.
0 N.
b.
4 N.
c.
16 N.
d.
20 N.
e.
none of the above
 

 8. 

A sportscar has a mass of 1500 kg and accelerates at 5 meters per second squared. What is the magnitude of the force acting on the sportscar?
a.
300 N.
b.
1500 N.
c.
2250 N.
d.
7500 N.
e.
none of the above
 

 9. 

A tow truck exerts a force of 2000 N on a car, accelerating it at 1 m/s/s. What is the mass of the car?
a.
667 kg
b.
1000 kg
c.
2000 kg
d.
8000 kg
e.
none of the above
 

 10. 

You pull horizontally on a 50-kg crate with a force of 450 N and the friction force on the crate is 250 N. The acceleration of the crate is
a.
2 m/s2.
b.
4 m/s2.
c.
9 m/s2.
d.
14 m/s2.
 

 11. 

A jumbo jet cruises at a constant velocity when the total thrust of the engines on the jet is 50,000 N. How much air resistance acts on the jet?
a.
0 N
b.
25,000 N
c.
50,000 N
d.
75,000 N
e.
100,000 N
 

 12. 

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.
a.
Sometimes true
b.
Always true
c.
Always false
 

 13. 

Forces always occur
a.
as single quantities.
b.
by themselves.
c.
in pairs.
d.
in triplets.
 

 14. 

A player hits a ball with a bat. The action force is the impact of the bat against the ball. What is the reaction to this force?
a.
The force of the ball against the bat
b.
The weight of the ball
c.
Air resistance on the ball
d.
The grip of the player's hand against the bat
e.
none of the above
 

 15. 

A person is attracted towards the center of Earth by a 440-N gravitational force. The force with which Earth is attracted toward the person is
a.
440 N.
b.
very very small.
c.
very very large.
 

 16. 

An unfortunate bug splatters against the windshield of a moving car. Compared to the force of the car on the bug, the force of the bug on the car is
a.
larger.
b.
the same.
c.
smaller.
d.
Need more information to say
 

 17. 

An unfortunate bug splatters against the windshield of a moving car. Compared to the deceleration of the car, the deceleration of the bug is
a.
larger.
b.
the same.
c.
smaller.
 

 18. 

A large truck and a small car traveling at the same speed have a head-on collision. The vehicle to undergo the greater change in velocity will be
a.
the small car.
b.
the large truck.
c.
neither—both are the same
 

 19. 

Bronco the skydiver falls toward Earth. The attraction of Earth on Bronco pulls him down. The reaction to this force is
a.
Bronco finally pushing against Earth's surface.
b.
Bronco pulling up on Earth.
c.
Earth's surface finally pushing against Bronco.
d.
neither A, B, nor C
 

 20. 

A rocket is able to accelerate in the vacuum of space when it fires its engines. The force that propels the rocket is the force
a.
of the rocket on the exhaust gases.
b.
of the exhaust gases on the rocket.
c.
neither A nor B
 

True/False
Indicate whether the statement is true or false.
 

 21. 

Inertia is the property that every material object has; inertia resists changes in an object's state of motion.
 

 22. 

The combination of all the forces that act on an object is called the net force.
 

 23. 

The acceleration of an object is inversely proportional to the net force acting on it.
 

 24. 

The net force on an objecting falling at terminal velocity is zero.
 

 25. 

The speed of an object dropped in air will continue to increase without limit.
 

 26. 

Whenever one object exerts a force on another object, the second object always exerts a force back on the first object.
 

 27. 

A rocketship is pushed forward by gases that are forced out the back of the ship.
 

 28. 

A bicycle and a parked car have a head-on collision. The force of impact is greater on the bicycle.
 

Problem
 

 29. 

You push with 27 N on a 10-kg chest, and there is a 7-N force of friction. How fast will the chest accelerate?
 

 30. 

Suppose that you exert 300 N horizontally on a 50-kg crate on a factory floor, where friction between the crate and the floor is 100 N. What is the acceleration of the crate?
 

 31. 

A 60-kg person on in-line skates pushes against a wall with a force of 30 N and recoils. What acceleration does that person experience?
 

 32. 

If we filled our water bottle rockets up with water and compressed air, then took them to outer space where there is no atmosphere, would the rockets still fly away when we released the plug?  Use this example of our rockets to explain Newton’s Third Law.
 



 
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