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A force is always required to move a bod...

A force is always required to move a body uniformly . Comment .

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The statement is wrong when we assume that there is no force of friction and air resistance etc . In that case , force is required only for producing acceleration in the body .
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No force is required to move a body uniformly along a straight line. Comment.

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According to Newton s second law of motion F =ma where F is the force required to produce an acceleration a in a body of mass m If a = 0 then F = 0 no external force is required to move a body uniformly along a straight line If a force F acts on a body for t seconds the effect of the force is given by Impulse =F xx t = change in linear momentum of the body A cricket ball of mass 150g is moving with a velocity of 12m//s and is hit by a bat so that the ball is turned back with a velocity of 20m//s if duration of contact between the ball and the bat is 0.01sec The impulse of the force is .

TRUE/FALSE TYPE QUESTIONS: No force is required to move a body with uniform velocity.

Assertion : No force is required to move a body unifromly along a straight line Reason : Because F = ma = m (0) =0 .

Is some force required to move a body uniformly along a circle?

Assertion : Linear momentum of a body changes even when it is moving uniformly in a circle. Reason : Force required to move a body uniformly along a straight line is zero.

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