Home Physics Work, Energy, Power and Collision Mix ABC is a fixed incline plane with D mid poin…
Physics Work, Energy, Power and Collision Mix MCQ (Single Correct)

ABC is a fixed incline plane with D mid point of AC. Part AD of incline plane is rough such that when a sphere released from A starts rolling, while the part DC is smooth. The sphere reaches the bottom point C, then –

A
It is in pure rolling in the part DC
B
Work done by friction on the sphere is negative when it moves from A to D
C
Mechanical energy of sphere remains constant for its motion from A to C
D
All of the above

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The correct answer is:
C

As surface DC is smooth it will slip but as in path AD it is in pure rolling therefore work done by friction is zero. Hence mechanical energy is conserved.

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