Energy y10

Question 1

What is the equation for GPE?

Answer 1

GPE= mass x gravity x height

Question 2

How do you find the energy of something moving up and down?

Answer 2

The KE at the bottom will be equal to the GPE at the top, so find one to find out the other. PofCofE

Question 3

How do you find out the efficiency?

Answer 3

Efficiency = useful energy out / total energy in (x100).

Question 4

How do you find out the efficiency over one second?

Answer 4

Efficiency = useful POWER out / total POWER in (x100)

Question 5

What are the rules when drawing a sankey diagram?

Answer 5

Use a scale for the different amount of energy. Draw the useful energy going forwards, and the waste energy going off the side.

Question 6

What is power and how do you find it out?

Answer 6

Power is the unit that tells us how much energy is used by a process PER SECOND.
Power(J/S or watts) = energy changed(J) / time taken(s)

Question 7

What is work done and how do you calculate it?

Answer 7

Work done is when you apply a force to an object, and make it move. Work done(J) = force(N) x distance moved in direction of force(M). The force is sometimes the weight.

Question 8

What is the equation for kinetic energy?

Answer 8

KE= 1/2 x mass x velocity^2