Work and Elastic Potential Energy. Work. Applying a force over a distance. W = F ∆x The force can’t be zero. The distance can’t be zero. Three Cases. Force Parallel to Motion Speeds it up Increases Energy Positive work Force Anti-Parallel to Motion Slows it down
The force can’t be zero.
The distance can’t be zero.
– Negative work
Work = Fave∆x = ½ k∆x*∆x = ½ kx2
A car of mass 1000 kg goes from a speed of 10 m/s to a speed of 20 m/s. How much work was done on the car?