What is air and water resistance?
Air and water resistance are frictional forces exerted on an object moving through air or water, pushing against the motion and trying to slow it down.
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Explain the effect of streamlined shapes on air and water resistance.
More streamlined shapes can slip through the air or water easily with less drag, reducing the effect of air and water resistance.
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Explain why a skydiver accelerates when they jump from a plane.
When a skydiver first jumps from a plane, gravity (weight) is more than air resistance, accelerating their downward fall.
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What is terminal velocity?
Terminal velocity is the constant speed that a falling object reaches when the resistance of the medium through which it is falling prevents further acceleration. This occurs when the air resistance balances the weight.
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Explain why a skydiver decelerates when they open their parachute.
When the skydiver opens their parachute, the air resistance greatly increases.
The air resistance becomes more than the weight, causing the speed at which the skydiver falls to decrease.
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What does it mean when the forces on a falling object are balanced?
When the forces on a falling object are balanced, it means that the object falls at a steady speed.
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