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Unformatted text preview: n θ (down ramp) vxf2 – vxi2 = 2 a Δx = 2 g sin θ (Δh/sin θ) = 2gh vxf2 = 2gh Three ways of looking at it N W W Work – Kine>c Energy theorem ½ m (vf2 – vi2) = W = ∫ F . dr = ∫ N . dr + ∫ Fg . dr = – ∫ mg dz = mgh vf2 = 2gh Unit 7 MAIN POINTS
Work and Kinetic Energy Definitions
The kinetic energy of an object is defined to be ½ the
product of the mass and the square of its velocity. The work done by a force as an object is moved between
two points along some path is defined to be the dot
product of the force with the displacement along the path
between those two points. K≡ 1
mv 2
2
&
r2 &&
W1→2 ≡ ³ F ⋅ dl
&
r1 The WorkKinetic Energy Theorem
Integrating Newton’s second law, we obtain the workkinetic energy theorem: the work...
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 Fall '08
 bennet
 Physics, Work

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