EXERCISE 3A
1
a.The Forces which act on when they are in physical contact are called contact forces.
1
a.The Forces which act on when they are in physical contact are called contact forces.
Example: frictional force and force exerted on two bodies during collision.
b. The forces experienced by bodies even without being physically touched are called non-contact forces.
Example: Gravitational force and Electrostatic force.
2
Contact force-(a) frictional force (b) normal reaction force (c) force of tension in a string
Non-contact force: (d) gravitational force (e) electric force (f) magnetic force
3.
a. Force exerted on two bodies during collision.
b. Magnetic force between magnetic poles.
4.
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5.
The magnitude of non-contact force on two bodies depends on the distance of separation between them.
The force decreases as the distance of separation increases.
The force is inversely proportional to the square of the distance of separation.