Work Force and Energy
Category : 5th Class
WORK, FORCE AND ENERGY
FUNDAMENTAL
FORCE
A force is a push or pull. It can help us to do the work. It brings the change or tries to bring the change in the state of motion. Force may be of various types, e.g. mechanical, gravitation, magnetic, frictional, electric and buoyant force.
WORK
Whenever an applied force is capable to move an object on which the force is applied, the work is done. No change in position means no work. Work is measured in joule, which means the object is displaced by one metre with one Newton Force.
SIMPLE MACHINE
It is a tool that makes the work easy. For example
LEVER
A lever is a simple machine. It is a rigid rod that turns around a fixed point called fulcrum. It consists of fulcrum (f), load (w) and effort.
Levers classified into three kinds according to the position of fulcrum, load and effort.
Type of Lever
1st Class Fulcrum between load and effort |
|
E.g. Scissors Claw-hammer |
2nd Class Load between fulcrum and effort |
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E.g. Nutcraker Wheel barrow |
3rd Effort between load and fulcrum |
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E.g. Finishing rod Broom |
PULLEY
WHEEL AND AXEL
INCLINED PLANE
SCREW
WEDGE
ENERGY
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