Types of Simple Machine

Subject: Science

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A lever is a rigid bar may be straight or bent which is capable of rotating fixed point called fulcrum.
A pulley is a metallic or wooden disc with a grooved rim. The rim rotates about a horizontal axis passing through its centre.
Slanted surface which is used to lift the heavy load by applying less effort is called inclined plane.
Wheel and axle consists of two coaxial cylinders of different diameters.