How is air resistance related to force?

Answer 1

Gravity is the rate of acceleration at which objects fall to the ground. As an object falls, it pushes air out of its way. Air is pushed upwards in the same direction and with the same amount of force known as its air resistance.

Air resistance is relevant to friction because it shows the impact of the object falling on the ground. If there was no friction the object would just drop in an instant.

Answer 2

Object held still at top of tower (velocity 0). Say 1 kg , g = 10 m/s/s , drag coefficient = 0.001

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Force down (newtons) = mass * acceleration due to gravity (g) = 10 newtons

Force up (newtons) = velocity2 * drag coefficient = 0 newtons

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On release, air friction will come into play, offering a resistance force increasing in proportion to the square of the velocity (exponential), until the upward force = downward force at terminal velocity.

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Terminal velocity = sq root ( 10 / 0.001 ) = 100 metres per second

Answer 3

As long as there isn't any deformation of the surface...meaning that the coefficient of friction remains constant, then "Friction is independent of Surface Area".

You may find this hard to believe, but think about the math. The force of friction is equal to the coefficient of friction times the weight (force/area) of the object as measured perpendicular to the surfaces in contact.

The weight of an object would be given as lbs/in2 or lbs/ft2 . The coefficient of friction is given as a number only, with no units. With a constant measurement of Force/(unit of area), as the area of force application decreases, the force increases, but stays EQUIVALENT considering area of application. For example:

100 lbs/1ft2 is equivalent to 14,400 lbs/1in2 . This is why tiny area high heels damage floors! They are 1/4 in or less in area, the Force is an incredible 57,600 lbs on that 1/4in of contact for a 100 lb woman.

So when the constant Coeff. of Friction is applied, the Force is still equivalent, given the measure of units of area.

Answer 4

It requires a force to propel an object through air, because of the air resistance. Normally, if there were no air resistance and the object were being propelled on the level with no friction, a constant force would accelerate the object steadily. However, it would require a steady force to propel the object through air even without acceleration. And the faster it went the more resistance it would meet.

Answer 5

R is prportional to A, where R is resistance and A is cross section area of conductor

Answer 6

Both of these can slow things down

Answer 7

Surface Area has no effect on Friction.

Answer 8

don't ask me cause i don't know

Answer 9

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