# Thought Of The Day_4_Work N Frames!!

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Note by Rohit Gupta
6 years, 2 months ago

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Since normal( Between block and wedge) is not a dissipative force hence net work done by it on the system is zero.

Now the lower wedge is getting velocity because of the normal force hence it is doing positive work on the wedge , since net work is zero it implies normal force does negative work on the block.

Ans) Negative

Another way to analyse the FBD of the block

The normal force is making an angle \theta with the positive y-axis and the block's displacement has two components one perpendicular to block and one along the -x axis. So work done in first component is zero and work done in second component is -Nxsin(\theta) ( The angle between normal and displacement(x) is 90+\theta)

It is clear work done is negative.

- 6 years, 2 months ago

Bhiya Can U give me ur Email ID ?

- 6 years, 2 months ago

Best of luck Bhaiya for Sunday. I am sure U will get AIR 1. $\ddot\smile$

- 6 years, 2 months ago

If by chance I would get a rank just under 100 I would be over the moon and you are talking about 1 Ha Ha Ha.

- 6 years, 2 months ago

Yes You are Right Here..!! Kudos..!!

- 6 years, 2 months ago

W=F.S when force is constant.
As clearly seen from diagram,angle b/w force and displacement is 90.
Hence, work done is 0

- 6 years ago

@Akhil Bansal I am sorry but the angle between force and displacement here is not 90..!!

- 6 years ago

Can you see this ?

- 6 years ago

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