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Curious about Work done by Gravitational force

  • #1

Homework Statement


I don’t understand why this would relate to cosine and not sine, if gravity is often assiciated in the up and down part of a free body diagram.

Homework Equations

Wg=mgdcos(theta)[/B]


The Attempt at a Solution


Is it because it would depend on your reference frame?
 

Answers and Replies

  • #2
gneill
Mentor
20,792
2,770
Hi Selectron09,

Welcome to Physics Forums.

Is it because it would depend on your reference frame?
Not really. It depends upon how the angle in question is defined; which "corner" of the right angle triangle is located with respect to the leg that represents your ##mgd##.

upload_2018-10-27_12-37-55.png
 

Attachments

  • #3
Oh! Ok that clears things up a lot. Thankyou.
 

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