Science & Mathematics » Physics » Physics: You have one object of each of these shapes, all with mass 0.840 kg : a uniform solid cylinder, a thin-walled hollow cylinder...?

Physics: You have one object of each of these shapes, all with mass 0.840 kg : a uniform solid cylinder, a thin-walled hollow cylinder...?

You have one object of each of these shapes, all with mass 0.840 kg : a uniform solid cylinder, a thin-walled hollow cylinder, a uniform solid sphere, and a thin-walled hollow sphere. You release each object from rest at the same vertical height h above the bottom of a long wooden ramp that is inclined at 31.0 ∘ from the horizontal. Each object rolls without slipping down the ramp. You measure the time t that it takes each one to reach the bottom of the ramp; (Figure 1) shows the results.

A- solid sphere
B- solid cylinder
C- hollow sphere
D- hollow cylinder

All objects have the same kinetic energy at the bottom of the ramp. Object D has the greatest rotational kinetic energy at the bottom of the ramp.

a) What minimum coefficient of static friction is required for all four objects to roll without slipping?

3 Answers3