UPSC Civil Services Model Paper 8

Force refers to a push or pulls which tries to change the state of rest, motion, size, or shape of an object.
Hence, Statement 1 is correct.
Its SI unit is Newton.
1 Newton is equal to 1 kg m∕s2 .
A force can cause an object with mass to change its velocity.
Fundamental Forces:
1. Gravitational Forces
2. Electromagnetic Forces
3. Strong Nuclear Forces
4. Weak Nuclear Forces
Non Fundamental Forces:
1. Friction
2. Tension
3. Elastic Force
4. Continuum Mechanics
5. Fictitious Forces
Newton's Second Law of Motion
The second law of motion refers to the general situation when there is a net external force acting on the body.
The momentum of a body is defined to be the product of its mass m and velocity v and is denoted by p: [p = mv]
Momentum is clearly a vector quantity .
The same force for the same time causes the same change in momentum for different bodies.
The rate of change of momentum of a body is directly proportional to the applied force and takes place in the direction in which the force acts.
Hence, Statement 2 is correct.