Page 26 - Science Class 6 Times Publication

3. Force can change direction of motion:
When a batsman hits cricket ball, the
direction of the ball changes. Similarly,
when a football player kicks a moving ball its
direction changes. Thus, the force changes
the direction of a moving object.

4. Force can change speed of a moving
body: A moving bicycle runs faster when it
is pushed from backside and it moves slower
when it is pulled from backside. Similarly,
a rolling ball moves faster when it is kicked
to the same direction.

Activity 2.3

To demonstrate that force can change the state of rest or motion

Keep a ball on the ground, the ball is in
the rest state. Kick the ball with your
leg. The ball comes to motion. Here,
change in the state of the ball from
rest to motion is due to the force applied
while kicking the ball. In the same way,
when you catch the moving ball, it comes
to rest.

Speed

Suppose a body moves from one place to another either in a straight
or curved path and covers 20 meter distance in 2 seconds, we can say
that it covers 10m distance in 1 second and its speed is 10m/s.
Speed is dened as the distance covered by an object in unit time.

Distance covered (d)
Speed =
Time taken (t)
Since, distance is measured in meter and time in second. Speed is
measured in meter per second (m/s). It is also measured in kilometer
per hour (km/hr).

Times' Crucial Science and Environment 22 Book 6