GCSE Questions: Energy Changes

Q6. The diagram shows Kaylee sliding down a zip wire.

(a) Describe how the vertical height of the tower could be measured accurately.

[2 marks]

(b) When using the zip wire, Kaylee moved through a vertical height of 2.0 m

Kaylee has a mass of 45 kg and the gravitational field strength = 9.8 N/kg

Calculate the change in Kaylee's gravitational potential energy. Give the answer to the correct number of significant figures.

[4 marks]

is 1.47 kJ. His mass is 60 kg and the gravitational field strength = 9.8 N/kg

Calculate the change in Johnny's vertical position.

[3 marks]

(d) Give three factors that affect a person's gain in kinetic energy by the time they reach the bottom of a zip wire.

[3 marks]

(e) As someone moves down the zip wire their increase in kinetic energy is less than the decrease in gravitational potential energy. Explain why.

[2 marks]

(f) Different people have different speeds at the end of the zip wire. Explain why.

[2 marks]

[Total 16 marks]