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on April 4, 2020
WORK, ENERGY AND POWER GO BACK
Work
Work is defined as the product of force and distance move in the direction of the force
W= F x s
The unit of work is JOULE
One Joule is defined as the Work done when a Force of 1 Newton move through a distance of 1 meter.
Example
A body is pushed on a horizontal surface by a constant force of 20N applied parallel to the surface
What is the work done in moving the body to a distance of 30m ?
What will be the work done if this force is applied to this body in the direction of N30E ?
Solution
W= F x s
W = 20 x 30 = 600j
If the force is applied in the direction N30E
W=Fsin30 x s
=20sin30 x 30 = 300j
Example
A body of mass 50Kg falls from a height of 3m. what is the work Done ? take g=9.8
Force = weight of the body = mass x acceleration due to gravity g
Force = 50 x 9,8 = 490N
Work =F x s = 490 x 3 = 1470joules
Posted in: Education
Topics:
work, energy and power
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