Force & Momentum (OCR GCSE Physics A (Gateway Science Suite)): Flashcards

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Force & Momentum
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Effect of a resultant force on an object

Causes acceleration

Equation for momentum

p=mvp = mv

Newton's 2nd Law equation

F=maF = ma

Equation for acceleration

a=v−uta = \frac{v-u}{t}

Force as change in momentum equation

F=mΔvΔtF = \frac{m\Delta v}{\Delta t}

Unit of force

Newtons (N)

Unit of change in momentum

kg m/s

What mΔvm\Delta v represents

Change in momentum

Faster rate of change of momentum means

Bigger force

Purpose of vehicle safety measures

Reduce rate of change of momentum

How seat belts reduce force on passengers

Stretch to increase stopping time

Purpose of airbags in crashes

Increase stopping time to reduce force

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