You have finished the 1st third of Forces! We have been through the unblurred points in the lists below. Continue to Forces 2.
All learned properties and mechanisms are stored as memories on your profile, where you can always go to brush them up. If you struggle with any topics in the tests, the Forces classroom is a great place to seek aid.
| New properties |
| Force | $\vec F$ |
| Mass | $m$ |
| Friction coefficients | $\mu_k$, $\mu_s$ |
| Stiffness / spring constant | $k$ |
| New phenomena |
| Pseudo-forces |
| Kinetic friction (Amontons' law) | $f_k=\mu_k n$ |
| Static friction | $f_s\leq \mu_s n$ |
| Weight | $w=mg$ |
| Normal force | $\vec n$ |
| Tension | $\vec T$ |
| Elastic force (Hooke's law) | $F_\text{elastic}=k\Delta L$ |
| New mechanisms |
| Newton's 1st law | $$\sum\vec F=0$$ |
| Newton's 2nd law | $$\sum\vec F=m\vec a$$ |
