Circular Motion and Friction?

1. Aug 9, 2012

lo31415926535

Circular Motion and Friction??

A crate of eggs is located in the middle of the flat bed of a pickup truck as the truck negotiates an unbanked curve in the road. The curve may be regarded as an arc of a circle of radius 33.5 m. If the coefficient of static friction between crate and truck is 0.610, what is the maximum speed the truck be moving without the crate sliding?

2. Aug 9, 2012

Jakeus314

Friction must supply at least enough centripetal force to do what is required to the crate... To follow that circular path.

3. Aug 9, 2012

lo31415926535

Re: Circular Motion and Friction??

So I drew a fbfd for the crate and so the force of friction = mv^2/r, right?
but how do I do this without the mass.. I think I need to find the force of friction and then solve for v?

4. Aug 9, 2012

Jakeus314

Friction is mu*m*g... And mv^2/r if it is going to cause circular motion.

m is on both sides of the resulting equation... :-)

5. Aug 9, 2012

lo31415926535

Re: Circular Motion and Friction??

Okay so the mass drops out!

mu*g=v^2/r and solve for vā¦ I will try that, thanks

6. Aug 9, 2012

lo31415926535

Re: Circular Motion and Friction??

Thank you very much Jakeus314!! It's been a while since I've done circular motion

7. Aug 9, 2012

Jakeus314

no problem. :-D