GCSE Energy (Physics Paper 1)

Question 1

Which equation correctly gives the kinetic energy of a moving object?

Accepted Answer

Ek = ½ × m × v²

Answer

Kinetic energy = ½ × mass × (speed)². Doubling the speed quadruples the kinetic energy because of the squared term.

Question 2

A 2 kg mass is lifted 5 m vertically. Taking g = 9.8 N/kg, how much gravitational potential energy does it gain?

Accepted Answer

98 J

Answer

Ep = m × g × h = 2 × 9.8 × 5 = 98 J.

Question 3

Which of the following is NOT one of the energy stores used in the 9-1 GCSE specification?

Accepted Answer

Sound

Answer

Sound is a way energy is transferred (by waves), not an energy store. The stores are kinetic, thermal, chemical, gravitational potential, elastic potential, nuclear, magnetic and electrostatic.

Question 4

Which equation defines the efficiency of an energy transfer?

Accepted Answer

Efficiency = useful output energy ÷ total input energy

Answer

Efficiency = useful output energy transfer ÷ total input energy transfer. It is a ratio between 0 and 1 (or 0% and 100%).

Question 5

A kettle has a power rating of 2000 W. How much energy does it transfer in 3 minutes?

Accepted Answer

360,000 J

Answer

E = P × t = 2000 W × 180 s = 360,000 J. Time must be converted to seconds.

GCSE - General Certificate of Secondary Education Practice Test

GCSE - General Certificate of Secondary Education Practice Test

GCSE Energy (Physics Paper 1)