Page 134 - SK Year 6 Science DLP

Calculating Speed

The speed of an object is the distance travelled by the object within a unit of time.
Observe the two situations in the pictures below.

Situation A
What is the
speed in
each of the
situation?
0 s 5 s
0 m 25 m

Situation B

0 s 10 s
0 m 50 m

Situations A and B show that the distance travelled increases as time increases.
Both pupils travelled 5 meters every second. Therefore, their speed is the same,
that is 5 m/s.

0 s 5 s

0 m 30 m
How can speed be calculated?
Let us calculate the speed of the motion of the
pupil above.
In the situation above, the distance travelled
HOTS
within 5 seconds is 30 metres. What is the HOTS
distance travelled in 1 second?
The distance travelled in 1 second
= 30 metres The measure of 50 cm is
5 seconds longer than 30 cm. Compare
50 cm/s and 30 cm/s. Which
= 6 metres per seconds
speed is higher? Why?
Therefore, the speed for the movement of
the pupil is 6 m/s.

126 7.1.4