CAIE IGCSE Physics 1.2 Motion Topic Practice

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Covered syllabus points

1.2.1—Speed as distance travelled per unit1.2.2—Velocity as speed in a given direction1.2.3—Recall/use: average speed = total1.2.4—Distance–time and speed–time graphs1.2.5—From given data or the shape of a1.2.6—Speed from the gradient of a1.2.7—Area under a speed–time graph to1.2.8—Acceleration of free fall g for an1.2.9—Acceleration as change in velocity per1.2.10—From given data or the shape of a1.2.11—Acceleration from the gradient of a1.2.12—A deceleration is a negative1.2.13—Motion of objects falling in a uniform

Question 1

[Maximum number: 3]

Fig. 1.1 shows a straight section of a river where the water is flowing from right to left at a speed of 0.54 m/s0.54 \mathrm{~m} / \mathrm{s}.

Fig. 1.1 (not to scale)

Fig. 1.1 (not to scale)

A swimmer starts at point P and swims at a constant speed of 0.72 m/s0.72 \mathrm{~m} / \mathrm{s} relative to the water and at right angles to the current.

After 1.5 minutes, the swimmer reaches point Q.

Calculate the distance between P and Q.
distance =

Question 2

[Maximum number: 3]

Fig. 2.1 shows a motorcyclist accelerating along a straight horizontal section of track.

Fig. 2.1

Fig. 2.1

The motorcyclist and motorcycle have a combined mass of 240 kg .

Question (a)

(a)

On the straight horizontal section of the track, the motorcyclist accelerates from rest at 7.2 m/s27.2 \mathrm{~m} / \mathrm{s}^{2}.

[ 2 ]

Question (i)

(i)

The motorcyclist reaches the end of the straight section of track in 5.3 s .

Calculate the speed of the motorcyclist at the end of the straight section.
speed =

[ 2 ]

Question (b)

(b)

At the end of the straight section, the track remains horizontal but bends to the right, as shown in Fig. 2.1.

When the motorcyclist reaches the bend, she travels around the bend in a circular path at a constant speed.

[ 1 ]

Question (i)

(i)

Describe what happens to the velocity of the motorcyclist as she travels around the bend at constant speed.

[ 1 ]

Question 3

[Maximum number: 9]

Fig. 1.1 shows the speed-time graph of a person on a journey.
On the journey, he walks and then waits for a bus. He then travels by bus. He gets off the bus and waits for two minutes. He then walks again. His journey takes 74 minutes.

Fig. 1.1

Fig. 1.1

Question (a)

(a)

For the whole journey calculate:

[ 5 ]

Question (i)

(i)

the distance travelled
distance =

[ 3 ]

Question (ii)

(ii)

the average speed.
average speed =

[ 2 ]

Question (b)

(b)

State and explain which feature of a speed-time graph shows acceleration.

[ 2 ]

Question (c)

(c)

State and explain the acceleration of the person at time =40 minutes.
[Total: 9]

[ 2 ]
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