Remember this is how the work formula is. You put all the forces as positives but the costheta part is the one that determines the angle. So we leave the force as positive. But then it would be cos180 which is negative 1.
A question, I always put the Wnet part in factorised form firstly by taking a direction as positive, example "(Force + Gravity -Friction) X displacement X cos(0)", this seems to work nicely, but my exposure to the topic regarding question papers is still a bit low, is there a chance this method can go wrong?
Hey Zhong, this approach also works very nicely :) I used to teach it like this a few years back but then started doing the separate approach. Nothing can go wrong but just always make sure you know whether the fnet is acting in the direction of motion or against as this will help you with the cos@ part :) Normally fnet is acting in same direction as motion so we use cos0 but there can be some questions where fnet is acting in opposite direction to motion like when the object is slowing down then we use cos180.
But why do we add those forces I mean only 2 forces are going in the same direction ,can't we add fk and wg parallels only because they are moving on the same direction and subtract force applied?
This video just solved my Work confusion thank you so much
Sameee,my teacher struggled to explain this clearly
I just started learning this today great timing
Pleasure!
Hey Kev, I'm sorry but why did you put Fg // as positive since it was in the oposite direction?
Remember this is how the work formula is. You put all the forces as positives but the costheta part is the one that determines the angle. So we leave the force as positive. But then it would be cos180 which is negative 1.
@@kevinmathscience ooh okay, thank you so much 🙏❤️
For non conservative force , isn’t tension one of them ?
Correct, that is also correct. It is any force besides gravity.
So would it be wrong to include Tension in your calculation?
damn! YOU DA PLUG
Thank you
Awesome! Pleasure :)
A question, I always put the Wnet part in factorised form firstly by taking a direction as positive, example "(Force + Gravity -Friction) X displacement X cos(0)", this seems to work nicely, but my exposure to the topic regarding question papers is still a bit low, is there a chance this method can go wrong?
Hey Zhong, this approach also works very nicely :) I used to teach it like this a few years back but then started doing the separate approach.
Nothing can go wrong but just always make sure you know whether the fnet is acting in the direction of motion or against as this will help you with the cos@ part :) Normally fnet is acting in same direction as motion so we use cos0 but there can be some questions where fnet is acting in opposite direction to motion like when the object is slowing down then we use cos180.
Can you do more wep questions with them giving you the co efficient knetic friction
But why do we add those forces I mean only 2 forces are going in the same direction ,can't we add fk and wg parallels only because they are moving on the same direction and subtract force applied?
I'm confused I thought I had to also indicate the tension in the rope
👀