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Give examples for newton's laws of motion

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1. The first law of motion is stated as: 
A body at rest will remain at rest, and a body in motion will continue in motion in a straight line with a uniform speed unless it is compelled by an external force to change its state of rest or of uniform motion.

  1. While travelling in a motorcar/ bike, we tend to remain at rest with respect to the seat.
  2. When we are standing on a bus and the bus begins to move suddenly then we tend to fall in the backward direction. This is because the sudden start of the bus brings motion to the bus as well as to our feet in contact with the floor of the bus. But the rest of our body opposes this motion because of its inertia.
  3. When a motorcar makes a sharp turn at a high speed, we tend to get thrown to one side.

2. Newton’s second law can be stated as:-
The magnitude of the net force acting on a body is proportional to the product of the mass of the body and its acceleration. The direction of the force is the same as that of the acceleration.

  1. If you jump from a height on a hard floor, you can hurt your feet because the feet come to rest in a very short time, and hence, the force exerted on your feet by the floor is very high. That is why athletes doing high jump land on sand or foam as it increases the time in which the body comes to rest. The sand gives way, allowing the body to slow down gradually. which decreases the force on the body, and the landing is comfortable.
  2. It is easier to catch a fast-moving cricket ball by pulling back your arms while taking the catch allowing you to catch the ball by applying a small force on it. If you keep your arms still as you catch the ball, you have to apply a much larger force on the ball. The duration for which the forces are applied are also different in the two cases. When you pull your arms back with the ball, you apply a smaller force for a long time because the ball stops completely only when your hands stop. In the second case, the ball stops almost immediately as it hits your still hands. You have to apply a larger force for a lesser time.

3. Newton's third law of motion states that whenever a body exerts a force on another body, the second body exerts an equal and opposite force on the first body.

For example, when a bullet is fired from a gun, the gun exerts a forward force on the bullet and the bullet exerts a backward force on the gun. That is why the gun moves back (recoil of the gun) when fired.

 

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Safeer PP

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