Energy conservation: past paper questions
Real questions on energy conservation
The newest 20 of 99 written questions. Open one to see it on the real paper.
- 9702/21 · May/June 2025 · Q1c(ii)[2]
By considering energy, state and explain the effect of the change in release angle on the speed at which B reaches the ground.
See it on the paper → - 9702/22 · May/June 2025 · Q1b(i)[3]
mv 2 . 2 E K = Using the concept of work done on the car, show that the kinetic energy E K of the car is given by the equation (i)
See it on the paper → - 9702/22 · May/June 2025 · Q1b(ii)[1]
The mass of the car is 920 kg. At time t = 0, the car is at rest. At time t = 5.8 s, its velocity is 17 m s –1 . Calculate the kinetic energy of the car at time t = 5.8 s. kinetic energy = J
See it on the paper → - 9702/23 · May/June 2025 · Q3b(i)[2]
Show that the increase in gravitational potential energy of the car in a time of 1.0 s is 46 000 J.
See it on the paper → - 9702/41 · May/June 2025 · Q3c[4]
An ice cube of mass 37.0 g at temperature 0.0 °C is placed in a beaker containing water of mass 208 g at temperature 26.4 °C. When all the ice has melted, and all the water in the beaker has reached thermal equilibrium, the final temperature of all the water is 10.3 °C. The specific heat capacity of water is 4.18 J g –...
See it on the paper → - 9702/43 · May/June 2025 · Q5c[3]
On Fig. 5.4, sketch the variation with h of the potential energy E P of the oscillations. 10 E P / J 5 0 0.4 0 0.8 1.2 1.6 h / m 2.0 2.4
See it on the paper → - 9702/22 · February/March 2025 · Q3a(ii)[3]
Determine the gain in kinetic energy of the truck between A and B. (ii) gain in kinetic energy = J
See it on the paper → - 9702/21 · October/November 2024 · Q3a[1]
State what is meant by the work done by a force.
See it on the paper → - 9702/21 · October/November 2024 · Q3b[2]
block, mass m Δh Fig. 3.1 Derive an expression, in terms of m and Δh, for the change in gravitational potential energy ΔE P of the block. State the meaning of any other symbols you use. (b) A block of mass m is raised vertically at constant speed. The vertical height gained by the block is Δh, as shown in Fig. 3.1.
See it on the paper → - 9702/21 · October/November 2024 · Q3c(i)[1]
Show that the work done by the motor on the load in 1.0 minute is 36 kJ.
See it on the paper → - 9702/21 · October/November 2024 · Q3c(ii)[2]
Determine the useful output power of the motor. power = W
See it on the paper → - 9702/21 · October/November 2024 · Q3c(iii)[2]
Use your answer in (c)(ii) to determine the efficiency of the motor. efficiency =
See it on the paper → - 9702/21 · October/November 2024 · Q4b(iii)[1]
State the name of the quantity represented by the area under the line in Fig. 4.1.
See it on the paper → - 9702/22 · May/June 2024 · Q1b(i)[3]
The power of the light incident on the solar panel is 750 W. Calculate the intensity of the light. intensity = W m –2
See it on the paper → - 9702/22 · May/June 2024 · Q1b(iii)[1]
The useful power output of the solar panel is 160 W. Calculate the percentage efficiency of the solar panel. efficiency = %
See it on the paper → - 9702/22 · May/June 2024 · Q1b(iv)[3]
Another square solar panel is placed so that light of the same intensity is incident normally on it. The new panel has shorter sides than the original panel. The new panel has the same power output as the original panel. State and explain whether the efficiency of the new panel is greater than, less than or the same as...
See it on the paper → - 9702/42 · February/March 2024 · Q2b(i)[2]
The piston is freely moving so that the gas is always at atmospheric pressure. Atmospheric pressure is 1.01 × 10 5 Pa. Calculate the work done by the gas. work done by gas = J
See it on the paper → - 9702/41 · October/November 2023 · Q2b(i)[1]
Show that the magnitude of the work done on the gas is 5000 J.
See it on the paper → - 9702/41 · October/November 2023 · Q2b(ii)[2]
Explain whether the work done on the gas is positive or negative.
See it on the paper → - 9702/41 · October/November 2023 · Q2b(iii)[2]
Determine the magnitude of the thermal energy q transferred to the gas. q = J
See it on the paper →
What examiners said
Most candidates were able to show their method for this calculation. A small number stated the volume change as 0.025 m3 but they did not show where this value came from.
— Examiner report, October/November 2023, 9702/43 Q2(b)(i) (Cambridge)
There were many responses here that gained full credit. Weaker candidates were less sure of the direction of the work done and stated that the work done on the gas was positive rather than negative.
— Examiner report, October/November 2023, 9702/43 Q2(b)(ii) (Cambridge)
Most candidates knew which formula to use here. A common error was to use an incorrect value for the thermal energy, for example using the increase in internal energy instead. Another common error was adding 273 to 56 in an attempt to convert the change in temperature into kelvin, rather than realising that a change in temperature is the same in both degrees Celsius and in kelvin.
— Examiner report, October/November 2023, 9702/43 Q2(b)(iv) (Cambridge)
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