Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision | Next revisionBoth sides next revision | ||
| 183_notes:work [2015/10/05 18:43] – [The Formal Definition of Work] caballero | 183_notes:work [2015/10/06 10:50] – [Work can be positive, negative, or zero] caballero | ||
|---|---|---|---|
| Line 53: | Line 53: | ||
| When the force has a component opposite the direction of motion, the work done by the force is negative; it decreases the kinetic energy of the system. | When the force has a component opposite the direction of motion, the work done by the force is negative; it decreases the kinetic energy of the system. | ||
| - | In case 3, the force is perpendicular to the direction of motion, hence the cart will neither slow down or speed up. It will experience an increased vertical force due to the track (by additional compression of the bonds in the track). This doesn' | + | In case 3, the force is perpendicular to the direction of motion, hence the cart will neither slow down or speed up. It will experience an increased vertical force due to the track (by [[183_notes: |
| $$W_3 = \vec{F}_3\cdot\Delta \vec{r}_3 = \Delta K_3 = 0$$ | $$W_3 = \vec{F}_3\cdot\Delta \vec{r}_3 = \Delta K_3 = 0$$ | ||
| When using work, it is critical to pay attention to the relative direction of the force and the displacement to determine how the kinetic energy will change (if at all). | When using work, it is critical to pay attention to the relative direction of the force and the displacement to determine how the kinetic energy will change (if at all). | ||
| - | |||
| ==== Lecture Video ==== | ==== Lecture Video ==== | ||