Physics Energy Practice Exam Questions
Learn more
Visit our Energy page for revision notes and videos to help you study.
Click to reveal answers
| Question | Answer | Extra information |
| 1 | any two from: bungee rope may snap rope may extend too much student may land in the river [2 marks] | |
| 2 | gravitational potential [1 mark] kinetic [1 mark] elastic potential [1 mark] | correct order only |
| 3 | ½ x 40 x 35² [1 mark] 24 500 (J) [1 mark] | accept 24,000 (J) (2 significant figures) allow 24,500 (J) with no working shown for 2 marks |
| 4 | g.p.e. = mass x gravitational field strength x height [1 mark] | accept Ep = mgh |
| 5 | Ep = 50 x 9.8 x 20 [1 mark] 9800 (J) [1 mark] | allow 9800 (J) with no working shown for 2 marks answer may also be correctly calculated using W = Fs ie allow W = 490 x 20 for 1 mark or answer of 9800 (J) using this method for 2 marks |
| 6 | 7840 (J) [1 mark] | allow ecf from '11.2' |
| 7 | 7840 = ½ x 50 v² [1 mark]
17.7(0875)(m/s) [1 mark] 18 (m/s) [1 mark] |
accept ecf from '11.3' correctly calculated for 3 marks allow 18 (m/s) with no working for 2 marks answer may also be correctly calculated using v² - u² = 2as |
| 8 | extension = 35 (m) and conversion of 24.5 kJ to 24500 J [1 mark] 24 500 = ½ x k x 35² [1 mark] 40 [1 mark] |
allow 40 with no working shown for 3 marks an answer of '16.2' gains 2 marks |
| 9 | weight (lifted) or height (lifted) [1 mark] | |
| 10 | any two from: calculate a mean spot anomalies reduce the effect of random errors [2 marks] | |
| 11 | as speed increases, the efficiency increases [1 mark] (but) graph tends towards a constant value [1 mark] |
accept efficiency cannot be greater than 100% |
| 12 | heating the surroundings [1 mark] | |
| 13 | 0 (%) [1 mark] | |
| 14 | chemical [1 mark] kinetic [1 mark] | in this order only |
| 15 | Ek = 0.5 x 80 x 12² [1 mark] Ek = 5760 (J) [1 mark] | an answer of 5760 (J) scores 2 marks |
| 16 | power = work done / time [1 mark] | allow P = W/ T |
| 17 | 200 = W/1800 [1 mark] W = 200 x 1800 [1 mark] W = 360 000 (J) [1 mark] | an answer of 360 000 (J) scores 3 marks
|
| 18 | 11 - 9.5 = 1.5 (m/s) [1 mark]
| an answer that rounds to 15.8 (%) scores 2 marks allow a change in speed between 1.2 and 1.5 (m/s) allow an answer consistent with their change in speed an answer of 16 (%) scores 2 marks |
| 19 | maximum speed is lower [1 mark] because maximum power output of cyclist is constant [1 mark] (but) additional work is done (against gravity) [1 mark] | allow maximum force on pedals is constant do not accept additional work done against friction or air resistance |
| 20 | P = 12 000 / 8.0 [1 mark] P = 15 000 (W) [1 mark] | an answer of 15 000 (W) scores 2 marks |
| 21 | energy is transferred in heating the surroundings [1 mark] friction causes energy to be transferred in non-useful ways [1 mark] | |
| 22 | gravitational potential energy = mass x gravitational field strength x height [1 mark] | allow Ep = m g h |
| 23 | Ep = 280 x 9.8 x 14 [1 mark] Ep = 38 416 (J) [1 mark] Ep = 38 000 (J) [1 mark] | accept 38 000 with no working shown for 3 marks
|
| 24 |  [1 mark]m = 1.2 × 2.3 × 104 [1 mark] m = 27 600 (kg) [1 mark] | an answer of 27 600 (kg) scores 3 marks
allow an answer of 28 000 (kg) or 2.8 x 104 (kg) |
| 25 | mass of air passing the turbine blades halved which decreases kinetic energy by a factor of two [1 mark] (wind speed is halved) decreasing kinetic energy by a factor of four [1 mark] so kinetic energy decreases by a factor of eight [1 mark] | allow power output for kinetic energy throughout |
| 26 | 388 000 = 0.5 x 13 800 x v² [1 mark]
v² = 56.2 [1 mark] v = 7.50 (m/s) [1 mark] | an answer that rounds to 7.50 (m/s) scores 3 marks this mark may be awarded if P is incorrectly / not converted this mark may be awarded if P is incorrectly / not converted
an answer that rounds to 7.50 (m/s) only |
[1 mark]
[1 mark]
