What force must be equal and opposite to the force of gravity for an object to reach terminal velocity?

• Normal Force

• Air Resistance

• Friction

• Tension

What is the force that causes objects to move in circles called?

• Centrifugal Force

• Friction

• Normal Force

• Centripetal Force

Is there a force of gravity between two people on Earth?

• Yes, but it's too big to notice

• Yes, but it's too small because the masses are small

• No, there is only force from the Earth

• I have no idea

At the START of the ball's motion, the ball is

• Slowing down

• Speeding up

• Not moving

• there is not enough information

Which picture in the image correctly shows the centripetal Force and Velocity on an object moving in a circle?

• A

• B

• C

• D

If forces A, B and C are equal, the work done by the forces as they are exerted on the box is:

• Greatest for force A

• Greatest for force B

• Greatest for force C

• It is the same for all forces

The action that would require no work to be done is:

• holding a 100-pound object over your head.

• pushing a 25-kilogram box of books across the floor.

• pedaling a 100-newton bicycle up a small hill.

• lifting a balloon filled with air from the floor to a desktop.

A worker uses a ramp to lift a heavy rock. If the mechanical advantage is 3 and the ramp length is 4 m, what is the height of the ramp?

• 1.3

• 2.3

• .75

• 12

How much work is needed to run a 60-watt light bulb for 5 seconds?

• 300J

• 60 J

• 30 J

• 12J

Which type of energy is the energy in food or fuel?

• Chemical Energy

• Heat/Thermal Energy

• Electrical Energy

• Gravitational Potential Energy