Everything Science Grade 10

21.7 CHAPTER 21. MOTION IN ONE DIMENSION

t

x

t 0 t

x

t 0 t

x

t 0 t

x

t 0

(a) (b) (c) (d)

5. [SC 2003/11] The velocity-time graphs of two cars are represented by P

and Q as shown

0

1

2

3

4

5

6

0 1 2 3 4

P

Q

t(s)

v(m·s−^1 )

The difference in the distance travelled by the two cars (in m) after 4 s is

...
(a) 12
(b) 6
(c) 2
(d) 0
6. [IEB 2005/11 HG] The graph that follows shows how the speed of an
athlete varies with time as he sprints for 100 m.
speed (m·s−^1 )

time (s)

10

t 11

Which of the following equations can be used to correctly determine the

timetfor which he accelerates?

(a)100 = (10)(11)−^12 (10)t

(b)100 = (10)(11) +^12 (10)t

(c)100 = 10t+^12 (10)t^2

(d)100 =^12 (0)t+^12 (10)t^2

7. [SC 2002/03 HG1] In which one of the following cases will the distance

covered and the magnitude of the displacement be the same?

(a) A girl climbs a spiral staircase.

(b) An athlete completes one lap in a race.

(c) A raindrop falls in still air.

438 Physics: Mechanics