# Forces And Motion Question Preview (ID: 2137)

When your bus driver slams on the brakes, your bookbag goes flying forward off your seat. Which of Newton's Laws explains this?
a) Newton's First Law: An object in motion will maintain its velocity unless acted on by an outside force.
b) Newton's Second Law: Force = Mass x Acceleration
c) Newton's Third Law: For every action force, there is an equal and opposite reaction force.
d) None of these laws explain this situation.

How much force is needed to accelerate a 5-kg bowling ball at a rate of 2 meters per second squared?
a) 2.5 N
b) 7 N
c) 10 N
d) 15 N

Which of the examples below IS an example of work being done on an object?
a) You push a heavy car as hard as you can, but it doesn't move.
b) You hold a heavy stack of books at shoulder level for 30 seconds.
c) You jump up and down for five minutes.
d) You push a 20-kg box across the floor for ten meters.

What two types of simple machines can be found in a pair of scissors?
a) Wedge and lever
b) Screw and pulley
c) Inclined plane and lever
d) Wedge and pulley

Which statement best describes the advantage of using simple machines?
a) Simple machines greatly decrease the total amount of work you need to do to complete a task.
b) Simple machines are very advanced and include the latest in scientific technology.
c) Simple machines make work easier by changing the amount of force you need or the direction in which it is applied.
d) There is no advantage to using simple machines.

Newton's third law states that for every action, there is an equal and opposite reaction. What is one example of this law?
a) It takes more force to accelerate a full shopping cart than an empty one.
b) If you are not wearing a seatbelt in a car crash, you will fly forward out of your seat as the car stops.
c) Cars traveling at higher speeds require more time to stop than cars traveling at slower speeds.
d) When a ballon pushes air backwards, the air pushes the balloon forward and causes it to move.

Why do cars traveling at faster speeds require more time and force to stop than cars traveling at slower speeds?
a) Cars traveling at faster speeds have less momentum.
b) Cars traveling at faster speeds have more momentum.
c) Cars traveling at faster speeds have less friction.
d) Cars traveling at faster speeds have more friction.

Which would have greater inertia and why: a small car or a large truck?
a) The small car, because objects with less mass have greater inertia.
b) The large truck, because objects with greater mass have greater inertia.
c) The small car, because objects that are closer the ground have greater inertia.
d) The large truck, because objects that are higher off the ground have greater inertia.

You lift a 20-kg stack of books from the floor up to a shelf that is 2 meters high. How much work have you done?
a) 40 joules
b) 20 joules
c) 10 joules
d) 400 joules

On a distance-versus-time graph, what does a straight diagonal line indicate?
a) A stopped object.
b) An object traveling at a constant speed.
c) An object that is speeding up.
d) An object that is slowing down.

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