Velocity versus time graph of a ball of mass 50 g rolling on a concrete floor is shown in the figure below. What will be the frictional force of the floor on the ball?
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Answer:
We know that Acceleration a=
t
v−u
=
8−0
0−80
=−10ms
−2
Now, Force=ma
m=50g=
1000
50
kg
So, F=ma=
1000
50
×10=0.5N
frictional force oppose the motion, so it is taken as positive with direction opposote to velocity.
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