Work-Energy Theorem Work : W net = F net d However, we know F net = ma So work gives an object some acceleration Acceleration means the velocity changes.

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Presentation transcript:

Work-Energy Theorem Work : W net = F net d However, we know F net = ma So work gives an object some acceleration Acceleration means the velocity changes

Derivation of Work-Energy Th. F = m ∆ a Fd = ma ∆ d v f 2 = v i 2 + 2a∆d  solve for a∆d a∆d = ½ (v f 2 – v i 2 ) F ∆ d = m ½ (v f 2 – v i 2 ) W net = ½ mv f 2 – ½ mv i 2

Kinetic Energy Energy due to motion – If something in motion hits an object, the object will move a some distance KE = ½ mv 2 – Scalar – Unit is joule (J)

Work-Energy Theorem Net work done = change in kinetic energy

Example 1 A kg arrow is fired horizontally. The bowstring exerts an average force of 65 N on the arrow over a distance of 0.90 m. With what speed does the arrow leave the bow? 39.5 m/s

Example 2 A foolish skier, starting from rest, coasts down a mountain that makes an angle of 30° with the horizontal. The coefficient of kinetic friction between her skis and the snow is She coasts for a distance of 20 m before coming to the edge of a cliff and lands downhill at a point whose vertical distance is 5 m below the edge. How fast is she going just before she lands? m/s

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