PHY221 Ch9: Work and PE

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# PHY221 Ch9: Work and PE - PowerPoint PPT Presentation

PHY221 Ch9: Work and PE. Recall main points: W non -conservative =  E mechanical Force from potential energy: Discussion and examples Foundation: work energy theorem: W = K Example of use of both energy and NII: Rollercoaster. PHY221 Ch9: Work and PE. Main Points.

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### PHY221 Ch9: Work and PE

• Recall main points:
• Wnon-conservative=Emechanical
• Force from potential energy:
• Discussion and examples
• Foundation: work energy theorem: W=K
• Example of use of both energy and NII: Rollercoaster

### PHY221 Ch9: Work and PE

Main Points

• Wnon-conservative=Emechanical

Proof:

• Force from PE :

Proof:

### PHY221 Ch9: Work and PE

Discuss

Problem: Start at top (y=h) at v =0. Loop-the-loop of radius R from ground; find max R for not falling off car w/out seatbelt.

Problem: Block down frictionless incline of height h into surface with kinetic friction mk. Distance d to stop block.