CP3

Question 1

What does the law of conservation of energy state?

Answer 1

Energy cannot be created or destroyed, only transferred into other forms

Question 2

What are the energy transfers in a battery torch?

Answer 2

What are the energy transfers in a battery torch?

Question 3

What are the energy transfers when a ball is thrown upwards into the air and then falls back down?

Answer 3

Energy transferred by forces from hand to the ball. Ball then has a store of kinetic energy which converts to gravitational potential as it rises, and then back to kinetic energy as it falls.

Question 4

What is the equation for calculating the efficiency of an object?

Answer 4

Efficiency = useful output / total input

Question 5

What is efficiency?

Answer 5

Measure of how much energy is usefully transferred

Question 6

What happens to wasted energy?

Answer 6

Dissipates (spreads) out into the surroundings