Homework Statement
A turntable is supported on a Teflon ring of inner radius R and outer radius R+δ (δ R), as shown in the diagram.
To rotate the turntable at a constant rate, power must be supplied to overcome friction. The manufacturer of the
turntable wishes to reduce the power...
Thanks for being patient with me. Here is a pic of the "correct work"
I still can't shake the weird feeling that this problem gives me. It doesn't feel right to set the normal force of the rear wheel to zero. I sort of get what you're saying about the wheel "just barely" touching the ground but...
Sorry for late reply. I'm getting ready for the snow lol. I just read my textbook and it says pivot points must be taken at center of mass if the object is accelerating so you are right about the pivot point I chose having other forces. Also is the force you talk about above the normal force of...
For the bike to not tip over the net torques must be zero and if taking the pivot point to be the front wheel contact point then the normal force on the back wheel times w must equal the weight of the bike times w/2?
Or in other words:
Fn(w)=Mg(w/2)?
So the front wheel would bear more weight because the bike is about to tip over correct? That makes the problem harder to solve :(. How would I solve for mu then if I have two different normal forces and therefore two different frictional forces? Thanks.
Hello mfb! Thank you for the fast reply. I just thought of the bike as not rotating so that if I solve for mu then I have the mu at which the bike does not rotate. I uploaded a picture of my work here: http://postimg.org/image/egoldhcp9/
sorry about the bad lighting.
Homework Statement
A simplified model of a bicycle of mass M has two tires that each comes into contact with the ground at a point. The wheelbase of this bicycle (the distance between the points of contact with the ground) is w, and the center of mass of the bicycle is located midway between...