Impulse
Impulse
It is termed as the total impact of force. This is equal to the change in momentum of the body. In other words, impulse is defined as the product of force and a small time in which the force acts.
SI unit of Impulse if N s (Newton Second) or kgm/s.
Impulse Equation:
Impulse is often stated to be the product of the average net force that acts on an object for a ceratin duration.The equation for impulse is given as;
Note : We assume that force is constant over time.
Impulse is a vector quantity like force and it also has direction.
Impulse - Momentum Theorem
The Impulse-Momentum theorem helps us establish the relation between the two concepts. The theorem basically states that the change that is seen in the momentum of an object is equivalent to the amount of impulse exerted on it.
Basically, you should understand that impulse is a measure of how much the momentum changes. Here we also get an alternative formula which is given as;
Where initial momentum,
final momentum
With this formula,we can further clearly relate impulse to the chnges in the momentum of the object.
Q.A 650 - kilogram rocket is to be speed up from 440 meters per second to 520 meters per second in outer space. If the thrust of the engine is 1200 newtons, for how long must the engine be fired?
Solution: The change in the momentum of the rocket
= (650)(520) - (650)(440) = 52000 kg m/s.
This must be equal to the impulse, so = (1200N)(t) = 52000 kg m/s
Therefore , = 43 s
A stationary ball weighing 0.25 kg acquires a speed of 10 m/s when hit by a hockey stick. The impulse imparted to the ball is _____________ | |||
| Right Option : A | |||
| View Explanation | |||
The velocity of a car of mass 3000 kg is changed from 18km/hr by applying a constant force . The impluse of the constant force acts. | |||
| Right Option : A | |||
| View Explanation | |||
The direction of impulse is | |||
| Right Option : A | |||
| View Explanation | |||
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