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Standard IX

Physics

Third Law of Motion

A heavy unifo...

Question

A heavy uniform bar is being carried by two men on their shoulders. The weight of the bar is $w$ . What is the work done by gravity?

w / 4

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w / 2

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w

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0

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Solution

The correct option is A $0$
The weight of the bar is acting downward and the men are moving forward.
Therefore, the force and the displacement are perpendicular to each other.
So, the force is not doing any work.

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A heavy uniform bar is being carried by two men on their shoulders. The weight of the bar is w. What is the work done by gravity?

The correct option is A 0The weight of the bar is acting downward and the men are moving forward.Therefore, the force and the displacement are perpendicular to each other.So, the force is not doing any work.

A heavy uniform bar is being carried by two men on their shoulders. The weight of the bar is $w$ . What is the work done by gravity?

The correct option is A $0$
The weight of the bar is acting downward and the men are moving forward.
Therefore, the force and the displacement are perpendicular to each other.
So, the force is not doing any work.