GPE-KE-EPE

........... ......... .......... or GPE is the energy that something has because of its position.

....... ....... is the energy that something has when it is moving. A lion chasing an antelope has lots of kinetic energy.

When materials are stretched or compressed their shape changes. We say that they ........

Materials that return to their original shape after being deformed are called ...........

Bows and arrows have been used for thousands of years. Scientists in Africa have found arrowheads that date back over 50 000 years. The archer pulls back on the bowstring and points the arrow at the target. The store of ....... ......... ......... (EPE) increases because the shape of the bow has changed.

What is gravitational potential energy?

• The energy of motion

• he energy stored in an object due to its position

• The energy of heat

• The energy of sound

What factors affect the gravitational potential energy of an object?

• Mass and height

• Mass and velocity

• Height and velocity

• Height and acceleration

The formula for calculating gravitational potential energy is:

• GPE = power x time

• GPE = force x distance

• GPE = 1/2 x mass x velocity^2

• GPE = mass x gravity x height

A 2 kg book is lifted 2 meters off the ground. What is its gravitational potential energy? (take g=10N/kg)

• 20 J

• 0.2 kJ

• 40 J

• 0.4 kJ

An object with a mass of 5 kg is raised to a height of 4 meters. What is its gravitational potential energy? (take g=10N/kg)

• 0.2 kJ

• 20 J

• 2000J

• 200 kJ