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_ Physics for pre-IGCSE-Homework sheet "7" Paper2: 1. In a training session, a racing cyclist's journey is in three stages. Stage 1 He accelerates uniformly from rest to 12 mls in 20 s. Stage 2 He cycles at 12 mls for a distance of 4800 m. Stage 3 He decelerates uniformly to rest. The whole journey takes 500 s. a. Calculate the time taken for stage 2. b. On the grid of Fig. 2.1, draw a speed/time graph of the cyclist's ride. 14 12 speed/ 10 m/s 8 6 4 2 0 0 100 200 300 400 500 time/s c. Show that the total distance travelled by the cyclist is 5400 m. d. Calculate the average speed of the cyclist. =

Physics for pre-IGCSE-Homework sheet 7 · _ Physics for pre-IGCSE-Homework sheet "7" Paper2: 1. In atraining session, aracing cyclist's journey is inthree stages. Stage 1Heaccelerates

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_ Physics for pre-IGCSE-Homework sheet "7"

Paper2:

1. In a training session, a racing cyclist's journey is in three stages.Stage 1 He accelerates uniformly from rest to 12 mls in 20 s.Stage 2 He cycles at 12 mls for a distance of 4800 m.Stage 3 He decelerates uniformly to rest.The whole journey takes 500 s.

a. Calculate the time taken for stage 2.

b. On the grid of Fig. 2.1, draw a speed/time graph of the cyclist's ride.

14

12

speed/ 10m/s

8

6

4

2

00 100 200 300 400 500

time/s

c. Show that the total distance travelled by the cyclist is 5400 m.

d. Calculate the average speed of the cyclist.

=

_ Physics for pre-IGCSE-Homework sheet "7"

2. A motorcyclist drives along a straight road. Fig. 6.1 gives information about the first 10 s of his ride.

startOm/s

after 5s8m/s

after10s18m/s

~------~~~--------------~~~-----Fig. 6.1

a. From the information on Fig. 6.1,

i. describe the motion of the motorcyclist by circling one of the following boxes,

Constant speed uniform acceleration uniform deceleration

ii. estimate the average speed of the motorcyclist during the lOs,

iii. Calculate the distance travelled during the 10 s.

b. State why the distance travelled in the first 5 s is less than half of the distance travelled in the first 10 s of thejourney.

3. Fig. 3.1 shows the speed-time graph of part of a short journey made by a cyclist.

25speed 20 P Q

mls

15

10

5

0 R

0 10 20 30 40 50 60 70 80 90 100time/s

Fig.3.1

21

/

_ Physics for pre-IGCSE-Homework sheet "7"

a. Which part of Fig. 3.1 shows when the cyclist is travelling at constant speed?

b. State what is happening during the rest of the journey shown in Fig. 3.1.

c.i. Calculate the distance travelled during the first 50 s.

ii. Calculate the distance travelled between 50 sand 100 s.