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
Choose the correct relation.
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| Right Option : D | |||
| View Explanation | |||
kg | |||
| Right Option : A | |||
| View Explanation | |||
A hammer weighing 3 kg, moving with a velocity of 10 m/s, strikes against the head of a spike and drives it into a block of wood. If the hammer comes to rest in 0.025 s, the impulse associated with the ball will be __________________ | |||
| Right Option : B | |||
| View Explanation | |||
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