DC -- gravitational PE

When there is work, there is a ______ of energy.

• increase

• reverse

• surplus

• transformation

GPE (PE_g) is work done against which force?

• gravity

• friction

• tension

• applied

If an object is lifted straight up at constant speed, then the force needed to lift it is equal to ___.

• the acceleration of gravity

• the mass of the object

• the weight of the object

If an object is lifted at constant speed, the work done on the object is equal to ___.

• m g h

• m a

• m w

• l w h

Because gravitational potential energy depends on relative position, we need ____.

• an acceleration due to gravity.

• an equal and opposite force according to Newton's law.

• a reference level at which to set the potential energy equal to 0.

• a perpendicular force to turn the system.

What animal is shown in a picture as an example in the reading?

• frog

• kangaroo

• bird

• horse

The equation ΔPE_g=mgh applies for any path that has a change in ____.

• gravity, g

• kinetic energy, KE

• speed, s

• height, h

Which path does the most work?

• using the stairs

• using the rope

• both do equal amounts of work (W)

What are the units for measuring GPE?

• J

• m/s/s

• kg

• N

Which of these diagrams was in the reading assignment?

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