Resultant Forces (AQA GCSE Physics): Flashcards

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Resultant Forces
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Resultant force definition

Single force with same effect as all original forces combined

Formula for opposing forces

larger force−smaller force\text{larger force} - \text{smaller force}

Finding resultant on straight line

Add (same direction) or subtract (opposite directions)

Two forces acting on skydiver

Air resistance and weight

Skydiver initial: resultant force

833N833N down (no air resistance, only weight)

Skydiver accelerating: 833N−350N=833N - 350N =

483N483N down

Balanced forces condition

Forces equal, resultant force = 00

Acceleration when resultant force is 00

No acceleration

Terminal velocity occurs when

Resultant force = 00 (forces balanced)

Free body diagrams show

Forces and their directions on an object

Force FF at angle θ\theta resolves into

Parallel and perpendicular components

Resolution formula for force FF at angle θ\theta

F2=(Fcos⁡θ)2+(Fsin⁡θ)2F^2 = (F \cos \theta)^2 + (F \sin \theta)^2

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