State newton's 2nd low of motion
Answers
Newton's second law of motion pertains to the behavior of objects for which all existing forces are not balanced. The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object.
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Newton's second Law of Motion.
Newton's second law of motion states that the rate of change of momentum of a body is directly proportional to the force applied, and this change in momentum takes place in the direction of the applied force.
Expression for Newton's second Law of Motion.
Consider a body of mass ‘m’ moving with velocity v.
The linear momentum of a body is given by:
p = mv
Now According to Newton’s 2nd Law of Motion:,
Force is directly proportional to rate of change of momentum, that is
F ∝ dp/dt
F = k dp/dt,
where k is the constant of proportionality and its value is 1.
F = 1 * d(mv)/dt
F = md(v)/dt
F = ma
Examples of Newton's second Law of Motion.
- Example 1:
While catching a cricket ball, the player keeps his hands backwards in order not to get hurt. In doing so, he increases the time taken by the ball to reach his hands which reduces the ball's velocity to zero and the player is not hurt.
- Example 2:
In a high jump event, the players are made to fall on cushioned bed or sand so that they don't get hurt. This increases the time taken by them to fall on the ground and hence their velocity is reduced to zero and they don't get hurt.