## anonymous one year ago The figure below shows a system of two masses connected by a string. As m falls a distance h, M accelerates up the plane. The coefficient of friction between M and the inclined plane is µ. What is the change in potential energy on the system after the m has fallen a distance h?

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1. anonymous

|dw:1443927305016:dw|

2. anonymous

@Photon336

3. Photon336

|dw:1443927600583:dw|

4. Photon336

@Michele_Laino @sweetburger @Shalante

5. anonymous

LOL thank you but i need the potential energy not tension

6. anonymous

my friend put PE=mgh so change in PE=mgh2-mgh1 but the teacher said that we need to include PE of the cart (M) @Photon336

7. Photon336

well. tension would cancel out :)

8. Photon336

but definitely you need to use that formula I think this problem would be more approachable if we just considered doing it in terms of potential energy

9. anonymous

oh ok! but where would i include h @Photon336

10. IrishBoy123

$$\Delta U = -mgh + Mgh \sin \theta$$