How do you find the minimum coefficient of friction needed to prevent slipping for part a and part b.(adsbygoogle = window.adsbygoogle || []).push({});

A hollow spherical shell of mass 4.00 kg rolls without slipping down a 38.0° slope.

(a) Find the acceleration.

3.62 m/s2

Find the friction force.

9.64 N

Find the minimum coefficient of friction needed to prevent slipping.

(b) How would your answers to part (a) change if the mass were doubled to 8.00 kg?

Acceleration

3.62 m/s2

Friction force

19.31 N

Coefficient of friction

for part a I already tried setting mgsinθ-μmgcosθ = 0

and got 0.781 but it was wrong.

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# Homework Help: Rotational dynamics and coefficient of friction

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