Physics 0625 · IGCSE · Motion

Motion — practice question

A drag car is a racing car driven by a rocket engine. This drag car starts from rest and speeds up uniformly until it gets to the finishing line. The engine is then turned off and a parachute opens. The car then slows down until it comes to rest. The mass of this drag car is 1400 kg. The car attains its top speed of 130 m/s at a time of 6.5 s.
(a(i))[2]

Calculate the car’s greatest momentum during the race.

(a(ii))[1]

State the part of Fig. 2.2 that represents the distance travelled by the car.

(a(iii))[2]

Determine how far the car travels in the first 6.5 s.

(b(i))[1]

Describe how Fig. 2.2 shows that, after 6.5 s, the car decelerates.

(b(ii))[1]

Describe how Fig. 2.2 shows that, after 6.5 s, the deceleration of the car is not constant.

(c)[2]

Describe the energy transfer that happens as the car slows down.

Worked solution & mark scheme

This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: The momentum is 1.8 \times 10^5 kg m / s OR 1.8 \times 10^5 N s.

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