Name the type of force which acts in the following cases :

(a) A coolie lifts a luggage

(b) A bicycle comes to rest slowly when the cyclist stops pedalling

(c) A stone falls from a roof

(d) A comb rubbed with silk attracts bits of paper

(e) A string hangs with a load

(f) A horse moves a cart

(g) A magnet attracts an iron pin

(h) A boy opens a door

(i) An apple falls from a tree

(j) A man rows a boat

(a) A coolie lifts a luggage : Muscular force

(b) A bicycle comes to rest slowly when the cyclist stops pedalling : Frictional force

(c) A stone falls from a roof : Gravitational force

(d) A comb rubbed with silk attracts bits of paper : Electrostatic force

(e) A string hangs with a load : Tension force

(f) A horse moves a cart : Muscular force

(g) A magnet attracts an iron pin : Magnetic force

(h) A boy opens a door : Muscular force

(i) An apple falls from a tree : Gravitational force

(j) A man rows a boat : Muscular force