I ) Give one word for the following :-
1. The net force which causes some effect on an object-
2. A device in which ball bearings are used to reduce friction-
II ) Select the correct option :-
1. Buring of a meteor in the atmosphere is due to .
a) Frictional force
b) Magnetic force
c) gravitational force
2. The deep groves in the tyres of a tracter-
a) increase friction
b) decrease friction
c) make it stable
3. The force which an object exerts on any other object is .
a) gravitational force
b) magnetic force
c) electrostatic force
d) frictional force
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