Q1. State and Derive Newton's second law of Motion.
Q2. Give reason why:
1. A cricket player moves hos hands backward on catching a fast Cricket ball.
2. Passengers in carcwear seat belts.
3. A high jumper is provided a cushion or heap of sand on the ground.
ITS URGENT PLEASE DON'T SPAM.
Answers
Answer:
Newton's second law of motion states that the acceleration of a system is directly proportional to and in the same direction as the net external force acting on the system, and inversely proportional to its mass. In equation form, Newton's second law of motion is a=Fnetm a = F net m .
fast moving cricket ball has a large momentum. In stopping or catching this ball, its momentum has reduced to be zero. Now, when a cricket player moves back his hands on catching the fast ball, then the time taken to reduce the momentum of ball to zero is increased.
The cars are provided with seat belts for passengers to prevent injuries in case of an accident. ... Due to this the momentum of the car reduces to zero in a very short time. The stretchable seat belts worn by the passengers increase the time taken by the passengers to fall forward.
When a high jumper falls on a soft landing site(such as cushion or a heap of sand), then the jumper takes a longer time to come to stop. The rate of change of momentum of athlete is less due to which a smaller stopping force acts on the athlete. And the athlete does not get hurt.