What is a wedge? Give two examples.
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A wedge is a simple machine having a sharp edge which is formed by putting two inclined planes together. Example : Knife, axe etc.
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What is wheel and axle ? Give two examples.
How does a wheel help in moving the axle?
Name the machine to which the following belong :
(a) Beam balance
(b) Lemon crusher
(c) Sugar tongs
(d) Ramp
(e) Door knob
(f) Needle
What care would you take to increase the life span of a machine which you use?