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Common forces in mechanics is considered one of the most asked concept.
7 Questions around this concept.
Gravitational force (Weight):-
Definition- Force with which earth attracts an object.
It always acts towards the center of the earth
It is denoted by W=mg, where m=mass of the body and g= acceleration due to gravity.
2. Normal Reaction(N ):-
Definition- A contact force between two bodies in physical contact which acts perpendicular to common surface in contact.
Normal reaction is always a push force
Examples of Normal reaction acting on a block kept on horizontal surface and inclined plane is shown in figures below-
Examples of Normal reaction acting on a rod resting between ground and wall is shown in figures below-
3. Tension(T):-
Force exerted by taut string, rope or chain against pulling force along the length .
It acts away from the point of contact.
It is always a pull force
Tension remains the same as long as the string is the same only in case of a massless string.
4. Spring Force:-
Spring force is a type of restoring force which tries to come back to its natural length.
where k is the spring constant and its unit is N/m and x is net elongation or compression in the spring.
Here -ve sign represents the restoring nature of the spring force.
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