Name the type of force which acts in the following cases:
(a) A coolie lifts a luggage
(b) A stone falls from a roof
(c) A comb rubbed with silk attracts the bits of paper.
(d) A horse moves a cart
(e) A magnet attracts an iron pin
(f) A boy opens the door
(g) An apple falls from a tree
(h) A man rows a boat.
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Answer: a) Muscular force
(b) Frictional force
(c) Gravitational force
(d) Electrostatic force
(e) Force of tension
(f) Muscular force
(g) Magnetic force
(h) Muscular force
(i) Gravitational force
(j) Muscular force
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