L14 能量 (Mechanical) Energy


News

No class next week -- only the midterm paper

Selected HW Questions from Motion in a Plane

Key Equations: No Time Data, No vectors!

$$ E_{mech} = {1 \over 2} \, m \vec v \cdot \vec v \, + \, U $$
$$ U = mgh \,\, (gravity, h \lt \lt R_{earth}) $$$$ U = {1 \over 2} \, k ( \Delta s )^2 \,\, (spring)$$
$$ \Delta E_{sys} \, = \, W $$

Lecture PPT (Knight-v4 Ch 9)


(also collison lab to introduce Elastic Collisions)
Energy Skate Park: Basics
Gravitational Potential Energy
Energy Skate Park
Gravitational Potential Energy
Masses & Springs
Springs (Elastic Potential)
Stretching DNA
Application: Optical Trapping (Microscopy)

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