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Conversion of P.E to K.E

show that the...

Question

show that the potential energy of a body is completely converted into kinetic energy during its free fall.

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Solution

$D e a r S t u d e n t, e n e r g y a t t o p w h e n t h e b o d y i s a t h e i g h t h = m g h A s b o d y o n l y p o s s e s p o t e n t i a l e n e r g y a n d n o k i n e t i c e n e r g y, h e n c e t o t a l e n e r g y = P . E + K . E = m g h + 0 A s t h e b o d y r e a c h e s t h e g r o u n d v a l u e o f h b e c o m e 0 . O n l y e n e r g y i t h a s i s k i n e t i c e n e r g y d u e t o i t s m o t i o n . T o t a l e n e r g y a t g r o u n d = K . E + P . E = K . E + 0 H e n c e i t p r o v e s t h a t t o t a l e n e r g y i s c o n v e r t e d i n t o k i n e t i c e n r g y . R e g a r d s$

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Conversion of P.E to K.E

Standard VIII Physics

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