# Resistence - The speed is so great that there is enough...

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Amna Sabahat Resistence

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Air resistance is fluid friction. Air resistance occurs between the surface of a falling object and the air that surrounds it. Rolling friction occurs when a rounded surface moves over a solid and sliding friction occurs when a solid moves over another solid. Static friction occurs when a solid touches another solid but there is no movement. What type of friction is Air resistance?
Air resistance works with surface area. two pieces of paper: one crumpled and one flat size and shape

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Air resistance pushes up while gravity pushes down. If the object was falling left or right, then air resistance would be opposite. Direction of Air resistance on object that is falling down
The drag increases as the speed of an object increases. A space shuttle or rocket comes back down to earth, there has to be fireproof shields.

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Unformatted text preview: The speed is so great that there is enough friction to start a fire. Speed increases When an object has no forces acting upon it other than gravity, the object is in free fall. The only time this would happen is if the object would be in a vacuum (space). All objects would accelerate at the same rate, which is 9.8 m/s/s. What does it mean when an object is in free fall? Gravity is the larger force and wins over air resistance. A skydiver: the diver falls (gravity is larger) until reaching terminal velocity (equal) then when the rip cord is pulled. Air resistance is larger for a short time until the diver continues to fall and reaches terminal velocity again before the diver hits the ground. A Skydiver http://www.youtube.com/watch?v=AnNHe-FRHr0 Air Resistance...
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## This note was uploaded on 01/17/2012 for the course MASS COMMU 107 taught by Professor Masror during the Spring '11 term at College of E&ME, NUST.

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Resistence - The speed is so great that there is enough...

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