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.
