Forces & Motion Test Review (H)

A force which causes an object to slow down when it touches another object is __________.

• speed

• applied force

• friction

• velocity

If an object stays still or continues moving at the same speed and in the same direction, it is a(n) ________________.

• balanced force

• unbalanced force

• net force

Sitting at the top of a steep hill on a roller coaster that is not moving is an example of ______________.

• acceleration

• inertia

• speed

• velocity

If the acceleration of an object is 400 m/s/s and the mass is 200 kg, calculation the force.

• 80000 N

• 80 N

• 8 N

• 800 N

If the force is 3500 N and the acceleration is 700 m/s/s, calculate the mass.

• .5 kg

• 5 kg

• 50 kg

• 500 kg

When a hammer exerts a force on the nail, the nail _________________________________________.

• exerts a smaller amount of force back onto the hammer

• exerts a larger amount of force back onto the hammer

• exerts the same amount of force back onto the hammer

• cries and cries and cries

A person steps out of the boat and onto the dock.  As the person moves forward onto the dock, the boat moves backward.  Which statement best describes the backward motion of the boat as the person steps forward?

• For every action there is an equal and opposite reaction.
• Every mass exerts a force on every other mass.
• An object at rest tends to stay at rest.
• Friction opposes the motion of an object.

The nozzle of a rocket is pointed downward so that as fuel is ignited, the exhaust pushes downward. Why is this arrangement necessary for a rocket to function properly?

• The rocket is protected from the heat of the exhaust.

• Burned fuel can be collected on the ground.

• As fuel is combusted, the rocket pushes the gases backward and the gases push the rocket forward.

• This allows the rocket to be steered properly.

A ball bat hits aball with a force of 100 Newtons. What is the force and direction exerted by the ball on the bat?

• 100 Newtons, same direction

• 100 Newtons, opposite direction

• 200 Newtons, same direction

• 200 Newtons, opposite direction

Which law is this picture illustrating?

• Law 1

• Law 2

• Law 3