A cylindrical drum rolls without slipping down an incline. The static frictional force:
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Question

A cylindrical drum rolls without slipping down an incline. The static frictional force:

G1 Physics · Accepted Answer

Step 1: Static friction at the contact point does zero work on the ideal rolling body, so it does not dissipate mechanical energy as heat. Step 2: Its torque produces rotational motion and channels part of the gravitational energy into rotational kinetic energy. Final answer: D — converts translational energy to rotational energy.