can enyone explain me the newtons 2nd law of motion (EXPLAIN)
Answers
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..
Newton's second law of motion states that the rate of change of the linear momentum is directly proportional to the impressed force and takes the direction in which the force acts.
For example:
One gets seriously hurt while jumping from the roof to a hard floor but does not get hurt , if he jumps from sand or form this is due to the total change in momentum m(v- u ) remains a constant quantity . When the person jumps from a certain height this change in momentum is numerically equal to a F*t where f is the force applied by the ground on the person and T the very short interval of time . When the person jumps on a hard floor the magnitude of time interval is very small with the result the force applied by the ground on the body of the person is very large, it is this force which is the cause of serious injury but while jumping on sand ,the person does not come to rest suddenly in other words the time interval increases . This in turn decreases the force acting on the body of the person to such a level that he does not gets hurt.
Hope it helps