4 Energy transfers

Question 1

What is the principle of conservation of energy?

Answer 1

Energy is not created or destroyed in any process

Question 2

How do you calculate the efficiency of something?

Answer 2

useful energy/total energy x100

Question 3

What is the work done formula

Answer 3

Work = Force (N) x distance (m)

Question 4

What is the formula for GPE?

Answer 4

GPE = m (kg) x g x h (m)

Question 5

What is GPE?

Answer 5

The gravitational potential energy

Question 6

What is the GPE equal to when you rise an object?

Answer 6

GPE = work done

Question 7

What happens in terms of energy when an object is held above the ground?

Answer 7

GPE = maximum
KE = zero

Question 8

What happens in terms of energy when an object is falling down?

Answer 8

GPE = decreasing
KE = increasing

Question 9

What happens in terms of energy when an object is about to hit the ground?

Answer 9

GPE = zero
KE = maximum

Question 10

What is the kinetic energy formula?

Answer 10

KE (J) = 1/2 x mass (kg) x speed^2

Question 11

What is the formula for power?

Answer 11

Power (W) = work (J) / time (s)