A homogeneous sphere rolls and slips simultaneously on a rough horizontal surface. Which is conserved during this process?
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A homogeneous sphere rolls and slips simultaneously on a rough horizontal surface. Which is conserved during this process?

G1 Physics · Accepted Answer

Step 1: About the instantaneous contact point, the friction and normal forces exert no moment. Step 2: With the sphere on a horizontal plane, the weight line is through the contact point so the external torque about that point vanishes at that instant. Step 3: This is the source-keyed angular-momentum conservation statement, option B. Final answer: B — angular momentum about the point of contact with the plane.