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**Unformatted text preview: **esimally small. It also says that if the net force on the object is zero, the object’s momentum does
not change. In other words, the linear momentum of an object is conserved when the net force equals
zero. We can also say that changing an object’s momentum requires the continuous application of a force
over a period of time Δt, leading to the definition of impulse. r r If a constant force F acts on an object, the impulse J delivered to the object over a time interval
Δt is given by ∆ (6) If you have had Calculus, it might be easier for you to use the integral form which is (7)
As we can see from equations (6) and (7), impulse is a vector quantity with the same direction as
the constant force acting on the object. When a single constant force acts on an object, we can
write equation (4) and (5) as
(8)
∆
∆
This is a special case of the impulse-momentum theorem. Equation (8) shows that the impulse of the
force acting on an object equals the change in momentum of that object. This is true even if the force
is not constant, as long as the time interval Δt is t...

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