GPE and KE AQA GCSE Physics

What is the law of conservation of energy?

• Energy can never be destroyed, only ever transferred or stored

• Energy is always the same

• Energy can never be destroyed, only ever used or wasted

• We must conserve energy to save the planet

For a swinging pendulum the energy changes are...

• From GPE to kinetic to GPE

• From GPE to chemical to GPE

• From Kinetic to chemical to Kinetic

• From Elastic Potential to kinetic to GPE

Wasted energy is...

• like wasted time

• Energy that is not useful

• always lost as heat

• Energy that is lost in the process of production.

In a closed system the total net energy of the system...

• Always increases

• Stays the same

• Always decreases

A pendulum will eventually slow down and stop because...

• Elastic energy is lost to the surrounding

• Kinetic energy is lost to the surroundings

• Heat energy is lost to the surroundings

• Gravitational potential energy is lost to the surroundings

(g=10N/kg) What is the GPE of an object with a mass of 4kg at a height of 25m?

• 10 J

• 100 J

• 1000 J

• 10,000 J

An object has a GPE of 10 kJ. What is this in joules?

• 0.010

• 10,000

• 100

• 1000

The mass of one rider on a slide is 40 kg.

The height of the slide is 10 m.

g = 10 N/kg

What is the GPE at the top?

• 40,000 J

• 40 J

• 400J

• 4000 J

 At the bottom of the slide the speed of the rider from the previous question is 4 m/s.
The mass of the rider is 40 kg.
Calculate the kinetic energy of the rider at the bottom of the slide.

• 320 J

• 3200 J

• 640 J

• 80 J

The height of some stairs was 2.5 m. A girl of mass 50 kg climbs them. If g = 10 N/kg, what is her gain in GPE?

• 625 J

• 1000 J

• 1250 J

• 500 J