Gravitational Potential Energy

Question 1

State the equation for gravitational potential energy (GPE)

Answer 1

GPE = mass × gravitational field strength x height
Ep = m x g x h
(Joules) (kilograms) (N/kg) (metres)

Question 2

A postman picks up an 800g parcel and lifts it onto a shelf 1.2m off the floor. How much gravitational potential energy does the parcel gain?

Answer 2

E Ep = m x g x h
U 800g = 0.8kg
S Ep = 0.8 x 9.8 x 1.2
A ✔️
C 9.4J

Question 3

Describe the relationship between kinetic energy (KE) and gravitational potential energy (GPE) if no work is done by drag

Answer 3

If no work is done by drag:
Gain in GPE = loss in KE
Loss in GPE = gain in GPE