How Does Starting Friction Compare to Moving Friction?

[phongbui]

Ok, i have a question that i need someone to put into simple terms, i kind of understand why, but it would be helpful if someone could explain it more simply.

How does the coefficient of friction associated with starting an object's motion compare to the coefficient associated with maintaining its motion?

Its something like it requires less force to move an object already moving and such.. but i still want a more explaining answer.

Thanks

 

[Delphi51]

I think you've got the idea all right. But the answer requires that you say clearly whether the dynamic coefficient of friction is larger or smaller than the static coefficient of friction. As a check on your deduction, you could check some coefficients in a table.

 

[tomcue]

The coefficient of friction is a measure of the resistance between two surfaces that are in contact with each other. It is a numerical value that represents the amount of force needed to overcome this resistance and move one surface relative to the other.

In terms of starting and maintaining an object's motion, the coefficient of friction can be thought of as the "initial" and "ongoing" resistance between the object and the surface it is on. When you initially try to move an object, there is a higher coefficient of friction because the object is at rest and there is a greater resistance to overcome. However, once the object is in motion, the coefficient of friction decreases because the surfaces are now sliding against each other and there is less resistance.

Think of it like pushing a heavy box across the floor. When you first try to move the box, there is a lot of resistance and it may be difficult to get it started. But once the box is in motion, it becomes easier to keep it moving because the coefficient of friction decreases.

In summary, the coefficient of friction associated with starting an object's motion is higher because there is more resistance to overcome, while the coefficient associated with maintaining its motion is lower because there is less resistance once the object is already in motion.