GCSE Questions: Energy Changes

Q8. The diagram shows Lana about to dive off a diving board.

(a) Lana has energy by virtue of her position and due to her speed of movement.

As she falls towards the water:

(i) name the type of her energy that decreases

(ii) name the type of her energy that increases

[2 marks]

(b) At the instant the diver hits the water, her kinetic energy is 5040 J.

If her speed is 12 m/s, calculate her mass.

[4 marks]

(c) When she hits the water an energy transfer occurs. Most of the kinetic energy of the diver is transferred to the water.

How does this affect the thermal energy of the water?

[1 mark]

[Total 7 marks]