You may use a calculator. You should show all your working and use appropriate units. Take the weight of 1.0 kg to be 9.8 N (acceleration of free fall = 9.8 m/s²).
(a)(i)
Fig. 2.1 shows a black car going up a hill on a sunny day.
State one way in which the car is gaining thermal energy.
Answer guidance
Describe Say what happens, in order. Reasons are not required unless the question also asks why.
[1 mark]
(a)(ii)
State one way in which the car is losing thermal energy.
Answer guidance
Describe Say what happens, in order. Reasons are not required unless the question also asks why.
[1 mark]
(b)
The car accelerates up the hill.
In addition to an increase in thermal energy, there are other energy transfers taking place.
Describe the other energy transfers.
[3 marks]
(c)
At one point in the motion, the kinetic energy of the car is 90 kJ.
The mass of the car is 800 kg.
Calculate the speed of the car.
speed = ...................................... m/s
Answer guidance
Calculate Show your working. The method can earn marks even when the final value is wrong, and a bare answer often cannot.
[3 marks]
5054/02/SP/23Cambridge O Level Physics 5054 · Specimen 2023 · Paper 2 · Question 2