when a body falls from height its Potential energy changes
Answers
Answer:
No. The process does not violate the law of conservation of energy. This is because when the body falls from a height, then its potential energy changes into kinetic energy progressively. A decrease in the potential energy is equal to an increase in the kinetic energy of the body.
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Answer:
Let a body of mass
′
m
′
placed at a height
′
h
′
above the ground, start falling down from rest.`
When the body falls from a height h to h/2, the potential energy is given as
2
mgh
.
The body covers the distance h/2 with a velocity v. We make use of the third equation of motion to obtain velocity of the body.
v
2
−u
2
=2aS
Here, u=0,a=g and S=x
v
2
−0=
2
2gh
,thatisv
2
=gh
Kinetic energy =
2
1
mv
2
That is, K.E=
2
mgh
Hence, at height h/2 the energy possessed is half potential energy and half the kinetic energy.