What is the Equation for Force of Friction?

[paigegail]

I think the reason that my problems have arisen is because of my equation for the force of friction. I have

Ff= ucosAngle

That right?

 

[chroot]

The force due to friction:

$$F = \mu N = \mu m g$$

Where $\mu$ is the coefficient of friction (either static of kinetic), and $N$ is the normal force. On a horizontal plane, the normal force is just the weight of the object, which is $mg$.

- Warren

 

[kishtik]

And to include the angle;
$$F_f=\mu mg cos \alpha$$

 

[himanshu121]

It is the limiting force of friction or say max friction force exerted and f force due to friction depends on the circumstance

For eg moving on a plane surface Chroots Ans is correct and in case if body is on inclined surface Kishtiks Ans is correct

 

[kishtik]

Originally posted by himanshu121
For eg moving on a plane surface Chroots Ans is correct and in case if body is on inclined surface Kishtiks Ans is correct

I love my equation. What is the angle for a plane surface? 0? Then what is cos0? 1? Then what is 1.mu mg? mu mg? Are the two eqs the same?

 

[PrudensOptimus]

Originally posted by himanshu121
It is the limiting force of friction or say max friction force exerted and f force due to friction depends on the circumstance

For eg moving on a plane surface Chroots Ans is correct and in case if body is on inclined surface Kishtiks Ans is correct

lol rofl same eq man.

 

[himanshu121]

It is not same equation

It is the case of the equation under the given conditions only

The force of friction is the force that resists the relative motion of two surfaces in contact. The force of friction is the force that resists the relative motion of two surfaces in contact. ...