Effect of friction on the foward momentum of an object

[soandos]

for example, if a mall is thrown, it forms a parabola, but its speed also decreases due to the friction in air.
what is the formula for that decrease?
what is the shape of the revised curve?
thanks.

 

[NoobixCube]

As a rule of thumb, friction is usually proportional to speed, often quoted as: F(friction)= -bv,
The revised curve is a parabola with a 'squashed' end half.

 

[berkeman]

As a rule of thumb, friction is usually proportional to speed, often quoted as: F(friction)= -bv,
The revised curve is a parabola with a 'squashed' end half.

I'm guessing you don't mean "shopping mall". That would have a lot of wind resistance, and would not travel very far when you threw it.

A google search on air resistance gives many useful hits. Here's the first{

http://en.wikipedia.org/wiki/Drag_(physics )


.

 

[soandos]

sorry "mall" was a typo, i meant ball.
another question on this topic:
assuming that a ball is thrown at a 100mph (in regular air) does that have a high Reynold's Number or not?
sorry, i do not take physics, so this might be a stupid question.