Friction
Friction
Two bodies placed in contact can exert forces parallel to the surfaces in contact. Force acting between the surfaces of two objects is called the force of friction. Force of friction always acts in the opposite direction of the movement of object. Force of friction is acting over all the moving objects. For example:
1. A moving ball stops after going to a certain distance. This happens because of force of friction between the surface of ground and the surface of ball.
2. A moving boat stops after some distance because of friction between the surface of water and the surface of boat.
Since force of friction comes into action only after interaction between two objects, thus, it is a type of contact force.
If the roughness of a surface is increased to a large extent, then the friction of the surface would ______________________. | |||
| Right Option : B | |||
| View Explanation | |||
When a bicycle is in motion, the force of friction exerted by the ground on the two wheels is such that is acts _______________ .
| |||
| Right Option : C | |||
| View Explanation |
A man sharpens his knife which of the following properties of friction are in use? (i) Friction helps us to hold objects. (ii) Friction acts in the opposite direction of motion. (iii) Friction causes the surface in contact to wear away. (iv) Friction produces heat energy. | |||
| Right Option : D | |||
| View Explanation | |||
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