Impulse (Grade 12 NSC Matric Physical Sciences): Flashcards

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Impulse
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Definition of impulse

Product of net force acting on object and time interval

Formula for impulse

Impulse=Fnet×Δt\text{Impulse} = F_{\text{net}} \times \Delta t

Units of impulse

N·s or kg·m·s−1^{-1}

Impulse-momentum theorem

Impulse equals change in momentum: Impulse=Δp\text{Impulse} = \Delta p

Area under force-time curve represents

The impulse delivered to the object

Impulse for constant force (rectangular profile)

Force × time

Impulse for triangular force profile

12×base×height\frac{1}{2} \times \text{base} \times \text{height}

Why car airbags increase collision time

To reduce force while maintaining same impulse/momentum change

Sign of impulse from force-time graph areas

Positive above time axis, negative below

Large force briefly vs small force longer

Can produce same impulse and same momentum change

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