(a) When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.
(b) How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?
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a) ..
work is done when the all following conditions followed ..
- when a Force acts on a body
- when we applied force so the object is displaced ( displacement of body )
formula
work done by body and against gravity
w = work done
m = mass
g = acceleration duo to the gravity
h = height
work done (W) = mgh
unit of work done = joule ( MKS system )
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b)
here force = 2 N
displacement = 10 cm = 0.1 m
work done = Force × displacement
= 2 × 10 cm
=2 × 0.1
= 0.2 joule
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