![]() When there is a bump on the road, a sudden force is transferred to the vehicle. The shock absorbers in two wheelers play the same role as airbags in the car. To prevent this fatal shock, cars are designed with air bags in such a way that when the car meets with an accident, the momentum of the passengers will reduce slowly so that the average force acting on them will be smaller.ģ. This is very dangerous for the passengers inside the car since they will experience a large force. When a car meets with an accident, its momentum reduces drastically in a very short time. To avoid getting hurt, the player brings the ball to rest slowly.Ģ. Due to this large average force, the hands will get hurt. So the average force acting on the body will be very large. ![]() It means that the momentum of the ball is brought to rest very quickly. If he stops his hands soon after catching the ball, the ball comes to rest very quickly. ![]() When a cricket player catches the ball, he pulls his hands gradually in the direction of the ball’s motion. The graphical representation of constant force impulse and variable force impulse is given in Figure 3.21.ġ. Since ∆ p is change in momentum of the object and is equal to impulse (J), we have The impulse can also be written in terms of the average force. Whenever the momentum of the body changes very quickly, the average force becomes larger. The average force acted on the object over the short interval of time is defined byįrom equation (3.25), the average force that act on the object is greater if ∆ t is smaller. If the force is constant over the time interval, thenĮquation (3.24) is called the ‘impulse-momentum equation’.įor a constant force, the impulse is denoted as J = F∆ t and it is also equal to change in momentum ( ∆ p ) of the object over the time interval ∆ t. Integrating over time from an initial time t i to a final time t f , we get If a force (F) acts on the object in a very short interval of time ( ∆ t ), from Newton’s second law in magnitude form If a very large force acts on an object for a very short duration, then the force is called impulsive force or impulse.
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