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Physics Form 4 Chapter 2 Force and Motion I

Q3 A student carried out an experiment with Q5 A car which is moving with a constant acceleration
a trolley running down an inclined runway. HOTS passes by lamp post A and lamp post B with a
–1
–1
Figure 2.24 shows a chart representing the velocity of 18 m s and 20 m s respectively.
motion of the trolley.
x / cm Lamp post B
Lamp post A
11
10
9
8 Figure 2.26
7
If the distance between the two lamp posts is 10 m,
6
calculate
5 (a) the acceleration of the car,
(b) the time taken by the car to travel from lamp
Chapter
4
2 3 post A to lamp post B.
2
2.2 Linear Motion Graphs
1
0 t / 5-tick
Figure 2.24
Displacement-Time Graphs
If the ticker timer made 50 ticks per second,
determine the
(a) initial velocity, Displacement, s 0 m 0.5 m 1.0 m 1.5 m 2.0 m
(b) final velocity, Time, t 0 s 2 s 4 s 6 s 8 s
(c) acceleration
of the trolley. Z Z Z

Q4 A cyclist cycled in a straight line at a velocity Displacement, s 0 m 0.5 m 1.0 m 1.5 m 2.0 m
of 8 m s on a hard surface. When he was Time, t 0 to 8 s
–1
6 m from a soft surface, he braked to slow the
bicycle down so that it entered the soft surface Figure 2.27 The tortoise and hare race
at a velocity of 4 m s .
–1
1. Figure 2.27 shows a tortoise moving at a slow
and steady speed while a hare is sleeping
soundly from the time t = 0 to 8 s.
Displacement, s / m Displacement, s / m
2.0
2.0
Hard surface 6 m Soft surface
1.5 1.5
Figure 2.25
1.0
1.0
(a) What is the time taken by the bicycle to slow
down from 8 m s to 4 m s ? 0.5 0.5
–1
–1
(b) Calculate the deceleration of the bicycle.
(c) The bicycle decelerated to a stop, with a 0 2 4 6 8 0 2 4 6 8
uniform deceleration, in 3 seconds after Time, t / s Time, t / s
entering the soft surface. Calculate the (a) Tortoise (b) Hare
distance travelled by the bicycle on the soft Figure 2.28 s-t graph
surface.
2. The motion of the tortoise and hare is
represented by the two displacement-time
graphs above.

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02 FOC PHYSICS F4 3P.indd 28 29/01/2020 1:39 PM