Force, work and energy
Category : 5th Class
Force, work and energy
Tit bits
Friction produces heat which is not always a disadvantage. For e.g., we use the heat produced by friction to light a match stick
(a) Lever. (b) Pulley.
(c) Wheel and axle. (d) Inclined plane.
(e) Screw. (e) Wedge,
A lever is a simple machine. It is a rigid rod that turns about a fixed point called fulcrum. It consists of fulcrum (F), load (W) and effort (P)
Levers are classified into three kinds according to the position of fulcrum, load and effort.
The three types of levers are shown in the table below:
Class of lever |
1st class fulcrum between load and effort l-F-E
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2nd class Load between Fulcrum and effort F-L-E
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3rd class Effprt netweem load and fulcrum L-E-F
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Examples |
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