A stone of 1 kg is thrown with a velocity of 20 m s-1 across the frozen surface of a lake and comes to rest after travelling a distance of 50 m. What is the force of friction between the stone and the ice?


The initial velocity of the stone, u= 20 m/s

The final velocity of the stone, v= 0

Distance covered by the stone, s= 50 m

Find out

The force of friction between the stone and the ice


We know the third equation of motion
v² = u² + 2as

Substituting the known values in the above equation we get,

0² = (20)² + 2(a)(50)

-400 = 100a

a = -400/100  =  -4m/s² (retardation)

We know that

F = m×a

Substituting above obtained value of a = -4 in F = m x a we get,

F = 1 × (-4) = -4N

(Here the negative sign indicates the opposing force which is Friction)



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1 Comment

  1. I loved how it is so detailed and explained very nicely

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