Newtons Law of Motion


 
 
Concept Explanation
 

Newton Law Of Motion

Newton's Law Of Motion:

Newton's First Law of Motion: It states that every body continues in its state of rest or of uniform motion in a straight line, except in so far as it be compelled by some external impressed forces to change that state.

Applications of this law can be felt in every day life. For example, if we are travelling in a car and the brakes are applied suddenly, the car stops immediately. However, we tend to keep moving forward according to the law of inertia. We may be thrown forward rather violently as a consequence.

Newton's Second Law of Motion: Force acting on a body causes change in its position or state of uniform motion; the acceleration produced is the effect. Newton's second law of motion relates these two quantities – force and acceleration. It states that the force on an object is directly proportional to the product of the mass of the object and its acceleration.The second law comes into play when a driver applies the brakes and the large decelerating force created in this way brings the vehicle rapidly to a stop. In a collision, a car is stopped almost instantaneously. The large deceleration that is developed corresponds to large stopping force. It is this force that damages cars in collisions. The faster a car is moving at the instant of impact, the greater the decelerating force and the more damaging the effect upon the car will be.

Newton's Third Law of Motion: It states - To every action there is always an equal and opposite reaction. It should be understood that action and reaction take place in pairs on different bodies. If they acted on the same body, the resultant force would be zero and there could never be accelerated motion.

For example, if we try to push a heavy door the force we exert on it accelerates it as it opens. Simultaneously, we feel the force exerted by the door on us impeding our movement.

Sometimes we can feel the reacting force. If we fire a rifle, the forward thrust of the projectile is matched by the backward thrust, which we call the recoil or "kick" of the rifle. Any one of the two forces may be called action and the other reaction.

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