CIE iGCSE Co-Ordinated Science P1.2 Motion Exam Style Questions Paper 4
Question
(a) Fig. 9.1 shows distance–time graphs for a car journey and a bicycle journey.
The car and bicycle both start from the same point and travel in the same direction along the same road.
(i) Use Fig. 9.1 to describe the car journey.
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(ii) State the time at which the bicycle passes the car.
time = ……………………………………………… s
(iii) The bicycle and rider have a combined mass of 80kg.
Use Fig. 9.1 to calculate the kinetic energy of the bicycle during this journey.
kinetic energy = ……………………………………………… J
(b) Bicycles are fitted with reflectors which reflect light from car headlights.
Fig. 9.2 shows a diagram of a reflector.
Explain why refraction does not occur:
(i) at point X.
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(ii) at point Y.
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▶️Answer/Explanation
Ans: 9(a)(i) constant speed, for 20 s / 250 m ;
stopping / stationary after 20 s / 250 m ;
9(a)(ii) 50 (s) ;
9(a)(iii) (v =) 300 ÷ 60 or 5.0 (m / s) ;
(KE =) 1⁄2 mv$^{2}$ or 0.5 × 80 × 5.0 $^{2}$;
(KE =) 1000 (J) ;
9(b)(i) (at X) the incident ray is at 90° / right angle to the surface / the angle of incidence is 0° / the incident ray is along the normal ;
9(b)(ii) (at Y) total internal reflection occurs ;
(because) angle of incidence is greater than the critical angle (for the two media) ;