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a 20 kg child starts from rest and slides down a 3 m high slide. if the child reaches the bottom with a speed of 1.25 m/s, how much energy was lost to heat during this process?



Answer :

Frictional heat generates when two surfaces slide against each other. The heat generated due to the friction in the given process is 536.1 j.

Frictional heat:

This heat is generated when two surfaces slide against each other.

Potential energy :  

U=mgh

Put the values

U=20×9.81×3

U=588.6 J

The Kinetic energy in the bottom:

K.E. = 1/2 m v2

K=55.5J

So the friction heat,

Hf = U - K

Hf = 588.6J - 55.5j

Hf = 536.1 j

Therefore, the heat generated due to the friction in the given process is 536.1 j.

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