Questions
A body having kinetic energy K moving on a rough horizontal surface is stopped in a distance x. The force of friction exerted on the body is
detailed solution
Correct option is B
Let f be the force of friction and m, the mass of the body.∴ Retardation a=f/mLet v be the initial velocity of the body, thenv2=2ax or 12mv2=maxor K = fx (∵ma=f)∴ f=K/x.Talk to our academic expert!
Similar Questions
A skier starts from rest at point A and slides down the hill without turning or breaking. The friction coefficient is . When he stops at point B, his horizontal displacement is s. What is the height difference between points A and B?
(The velocity of the skier is small, so that the additional pressure on the snow due to the curvature
can be neglected. Neglect also the friction of air and the dependence of on the velocity of the skier.)
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