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Question
Harsh rides a bike on a straight road and the speed-time graph of his journey is as shown. During which labelled part of the journey is the resultant force on the bike is zero?
Harsh rides a bike on a straight road and the speed-time graph of his journey is as shown. During which labelled part of the journey is the resultant force on the bike is zero?
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Solution
The correct option is B B
The straight horizontal line on the graph in the part B indicates that the speed does not change. Direction also does not change since the cycle is moving on a straight road. This means velocity is constant in region B. Hence, acceleration is also zero.
Using second law motion, net force is also zero in region B.
In parts A, C and D, the speed is changing. This means there is non-zero acceleration and hence, non-zero force.
The straight horizontal line on the graph in the part B indicates that the speed does not change. Direction also does not change since the cycle is moving on a straight road. This means velocity is constant in region B. Hence, acceleration is also zero.
Using second law motion, net force is also zero in region B.
In parts A, C and D, the speed is changing. This means there is non-zero acceleration and hence, non-zero force.
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