Define a simple machine. Explain the different types of machines with examples.
Answers
simple machine, any of several devices with few or no moving parts that are used to modify motion and the magnitude of a force in order to perform work. The simple machines are the inclined plane, lever, wedge, wheel and axle, pulley, and screw.
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A tool that helps us to do our work with less effort is called a simple machine. there are six types of simple machines.
(i) lever : A lever is a rigid rod arranged in such a manner that it can move freely around a fixed point .
Eg: Scissors,Nut cracker, Fishing rod
(ii) Wheel and Axle : A wheel and axle consist of a wheel rigidly attached to a rod called axle.
Eg: door knob, steering wheel of a car
(iii) Pulley : A pulley consists of a wheel with a
grooved rim and a rope , a chain, or a belt running around the grooves.
Eg : Pulley in crane, flag pole
(iv) Inclined plane : An inclined plane is a slope with one and higher than the other .
Eg: ramps in the hospital ,slides in a playground
(v) Wedge : A wedge is a double incline plane and one end is sharp and the other blunt . it is used to cut things.
Eg : Knife, Axe
(vi) Screw : It is an incline plane wrapped around a straight rod like structure . it is used to hold things together.
Eg : Screw Jack, Bottle cap
