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# Summary of Forces 1

You have finished the 1st third of Forces! We have been through the unblurred points in the lists below. Continue to .

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$$\sum\vec F=m\vec a$$