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Byju's Answer
Standard VIII
Physics
Force
Does the work...
Question
Does the work done is moving a body depend on how fast or how slow the body is moved?
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Solution
Yes
In Physics, Work is defined as force causing the movement or displacement of the object
Work =
d
i
s
t
a
n
c
e
×
s
p
e
e
d
According to newtons second law : Force =
m
a
s
s
×
a
c
c
e
l
e
r
a
t
i
o
n
If we consider velocity of the object is zero (Acceleration also zero), ultimately work done on the object also zero
So work done on the object is depend on the velocity of the object
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Name the physical quantity which gives us an idea of how slow or fast a body is moving.
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Work done by a force depends upon how fast work is done.
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Assertion :Work done in moving a body over a closed loop is zero for every force in nature. Reason: Work done does not depend on nature of force.
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How does the kinetic energy of a moving body depend on its (i) speed, and (ii) mass?
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Statement - 1 : Work done by a force on a body whose centre of mass does not move may be non-zero.
Statement -2 : Work done by a force depends on the displacement of the centre of mass.
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