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

(A) : Force is required to move a body uniformly along a circle. (R) : When the body is in uniform circular motion, acceleration is zero.

(A) : Force is required to move a body uniformly along a circle. (R) : When the body is in uniform circular, acceleration is zero.

No force is required to move a body uniformly along a straight line. Comment.

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

Assertion : Force is required to move a body uniformly along a circle. Reason : When the motion is uniform, acceleration is zero.

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 Average force exerted by the bat is .

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 The retardation of the ball is .

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 .