Newton's Laws

T or F: Inertia is a force that keeps stationary objects at rest and moving objects in motion at a constant velocity.

False

A ball is thrown vertically upwards. After the ball is released and is moving upwards towards its peak, it slows down. During this time, ____. a.the ball is experiencing an unbalanced force; it is directed downwards. b.the ball is experiencing an unbalanced force; it is directed upwards. c.there are no forces whatsoever acting upon the ball. d.the forces acting upon the ball are balanced. e.none of these

a

An object experiences a rightward force of 3 N, a leftward force of 5 N, an upward force of 10 N and a downward force of 10 N. Which one of the following conclusions can be made about the object's motion? a.It will accelerate. b.If it is at rest, then it will stay at rest. c.If it is moving, then it will slow down. e.If it is moving, then it will continue moving.

a

An object is moving along a level surface with a constant velocity. The net force acting upon the object is _____. a.zero b.in the direction of motion c.opposite the direction of motion d.Cannot be determined from this information

a

An object that is experiencing two horizontal forces - a rightward and a leftward force - is moving to the left with a constant speed. What can be concluded about the strength of these two forces? a.The two forces have the same strength. b.The rightward force is stronger than the leftward force. c.The leftward force is stronger than the rightward force.

a

An object that is experiencing two vertical forces - an upward and a downward force - is moving downward with a constant speed. What can be concluded about the strength of these two forces? a.The two forces have the same strength. b.The upward force is stronger than the downward force. c.The downward force is stronger than the upward force.

a

How much force is required to keep a 4-kg object moving to the right with a constant speed of 8.0 m/s? a.0 N b.0.5 N c.2.0 N d.32.0 N

a

Mac and Tosh are arguing in the cafeteria. Tosh says that if he flings the jello with a greater speed it will have a greater inertia. Mac argues that inertia does NOT depend upon speed, but rather upon mass. Who is correct? a.Mac b.Tosh c.Neither are correct in the conception of inertia.

a

Which of the following can be explained using Newton's first law of motion? a.It explains why a moving object keeps the same velocity. b.It explains why every force is accompanied by a reaction force. c.It explains why an object accelerates with a particular acceleration value.

a

Which of the following can be explained using Newton's first law of motion? a.It explains why a stationary object remains stationary. b.It explains why every force is accompanied by a reaction force. c.It explains why an object accelerates with a particular acceleration value.

a

T or F: A rightward-moving object would naturally and ultimately come to rest in the absence of forces. A rightward force is required to keep such an object moving rightward. Inertia is the general name given to that force.

false

T or F: inertia is NOT a force. A rightward-moving object naturally maintains its state of rightward motion in the absence of forces. A rightward force is not required to keep such an object moving rightward.

true

An object experiences a rightward force of 8 N, a leftward force of 8 N, an upward force of 10 N and a downward force of 10 N. Which one of the following conclusions can be made about the object's motion? a.It will accelerate. b.If it is at rest, then it will stay at rest. c.If it is moving, then it will slow down. e.If it is moving, then it will speed up.

b

Suppose that an astronaut throws a rock in outer space at a location far from significant influences of gravity and air resistance. One would expect that the rock would ____. a.eventually stop since all objects ultimately "lose their steam" b.continue in motion with the same speed and direction c.eventually stop as its inertia slowly becomes used up d.It depends on whether the astronaut continues to push it

b

Which one of the following quantities describes an object's tendency to resist a change in its state of motion? a.Volume of the object. b.Mass of the object. c.Force exerted by an object.

b

An elevator is supported by a cable and moving downward through the elevator shaft at a constant speed. How does the upward tension force compare to the downward force of gravity? a.The upward tension force is stronger than the downward force of gravity. b.The downward force of gravity is stronger than the upward tension force. c.The tension force and the force of gravity are of equal strength.

c

An elevator is supported by a cable and moving upward through the elevator shaft at a constant speed. How does the upward tension force compare to the downward force of gravity? a.The upward tension force is stronger than the downward force of gravity. b.The downward force of gravity is stronger than the upward tension force. c.The tension force and the force of gravity are of equal strength.

c

An object moving at a constant velocity MUST _____. a.have a net force acting on it b.eventually stop due to the force of gravity c.be experiencing a balance of forces d.not have a force of friction acting on it e.not have any forces exerted upon it

c

If the forces acting upon an object are balanced, then one can be certain that the object is _____. a.at rest b.moving c.not accelerating d.moving with a constant speed

c

Newton's first law of motion applies to _____. a.objects that are at rest. b.objects that are moving with a constant velocity. c.both objects that are at rest and those that move at constant velocity.

c

The individual forces acting upon an object are balanced. What can be concluded about the object's motion? a.The object is not moving. b.The object is slowing down. c.The object is not accelerating.

c

Which of the following is ALWAYS true of an object that is acted upon by an unbalanced force? a.The object is at rest. b.The object is moving. c.The object is accelerating. d.The object has a constant velocity value.

c

Which one of the following statements is true of an object that remains at rest? a.There are no forces acting upon the object. b.There is no gravity acting upon the object. c.The individual forces acting upon the object are balanced. d.The individual forces acting upon the object are NOT balanced.

c

Which two of the following statements about inertia are true? a.Inertia is the force that keeps a moving object in motion. b.Inertia is the force that keeps a stationary object at rest. c.Inertia is the natural tendency of a stationary object to resist motion. e.Inertia is the natural tendency of a moving object to resist a change in its velocity.

c & e

A sled slides down a hill, reaches the level surface and eventually comes to a stop. The fact that the sled ultimately stops is best explained by ____. a.the presence of inertia causes it to stop b.the natural tendency of any object is to ultimately stop c.the fact that there was no force to keep the sled moving forward at a constant speed d.the presence of an unbalanced force (e.g., friction) that causes a moving object to stop

d

An object is moving to the left with a constant speed. What can be concluded about the forces acting upon the object? a.There is a leftward force but no rightward force. b.There are only vertical forces acting upon the object. c.There is a stronger leftward force than the rightward force. d.All the individual forces acting upon the object are balanced.

d

An object is moving to the right with a constant speed. What can be concluded about the forces acting upon the object? a.There is a rightward force but no leftward force b.There are only vertical forces acting upon the object. c.There is a stronger rightward force than the leftward force. d.All the individual forces acting upon the object are balanced.

d

An object remains at rest. What can be concluded about the forces acting upon the object? a.There are no forces acting upon the object. b.The forces that act upon the object have a strength of 0 Newton. c.There are four forces acting upon the object; they are all equal. d.The forces that act upon the object balance each other.

d

When comparing Object A and Object B, it is observed that Object A has a greater tendency to resist changes in its state of motion. What does this observation indicate about Object A and Object B? a.Object A is acted upon by more force than Object B. b.Object A is a solid and Object B is either a liquid or a gas. c.Object A has more inertia than Object B. d.Object A experiences a lot more friction than Object B.

d

A 3-kg object is moving to the right at a constant velocity of 2 m/s. Which one of the following applied forces is required to maintain this state of motion? a. 6 N b. 1.5 N c. 0.667 N d. 0 N e. Cannot be determined from this information

e

An object will not have any inertia if it is _____. a.in space b.at rest c.accelerating d.acted upon by an unbalanced force e.All objects have inertia.

e

If you were in a spaceship and fired a cannonball into friction less space, the amount of force needed to keep the cannonball in motion would be ____. a.more than the force with which it was fired b.less than the force with which it was fired c.equal to the force with which it was fired d.equal to the weight of the cannonball e.Zero

e