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Friction force
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Parachutist opens the parachute on landing.
to increase surface area that increase air resistance , and slow down his motion to land safely.
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The fish has streamline shape.
To decrease the surface area, so the water resistance decreases.
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Is it easier to ski on grass or snow ?, Why ?
To ski on snow , as the snow is smooth ,The friction force depends on the type of the material directly in contact with the base of the snow scooter.
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It is a type of friction force that happens when a body moves through air.
Air resistance
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It is a type of friction force that happens when a body moves through water.
Water resistance.
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The force between two surfaces in contact that acts in a direction opposite to the direction of motion and causes the object to slow down and stop.
Friction force.
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Air crafts are desighned in streamline shape.
To decrease the surface area , so the air resistance decrease, and the speed increase.
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Okay!
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