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COM of Center of Masses

When a block ...

Question

When a block is placed on a wedge as shown in the figure. The block starts sliding down and the wedge also starts sliding on ground. All surfaces are rough. The centre of mass of (wedge + block) system will move

A

Leftward and downward

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B

Rightward and downwards.

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C

Leftward and upwards.

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D

Only downward.

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Solution

The correct option is B Rightward and downwards.
Friction force between wedge and block is internal i.e. will not change motion of COM. Friction force on the wedge by ground is external and causes COM to move towards right. Gravitational force (mg) on block brings it downward hence COM comes down.

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