When We Apply the Energy Conversation Principle to a Cylinder

question 39

Multiple Choice

When we apply the energy conversation principle to a cylinder rolling down an incline without sliding, we exclude the work done by friction because:

• A)there is no friction present
• B)the angular velocity of the center of mass about the point of contact is zero
• C)the coefficient of kinetic friction is zero
• D)the linear velocity of the point of contact (relative to the inclined surface)is zero
• E)the coefficient of static and kinetic friction are equal