Download - PHY221 Ch9: Work and PE
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PHY221 Ch9: Work and PE
1. Recall main points: • Wnon-conservative=Emechanical
• Force from potential energy: 2. Discussion and examples• Foundation: work energy theorem: W=K• Example of use of both energy and NII: Rollercoaster
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PHY221 Ch9: Work and PE1.
Mai
n Po
ints
Wnon-conservative=Emechanical
Proof:
Force from PE :
Proof:
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PHY221 Ch9: Work and PE2.
Dis
cuss
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.
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