Skill 11 of 11
In Progress

Summary of Forces 2

You have finished the 2nd third of the Forces discipline! Continue to Forces 3 to complete the Forces discipline.

All learned properties and mechanisms are stored as memories on your profile, where you can always go to brush them up. Don’t forget the Forces classroom for aid, questions and guidance while doing the finishing tasks.

New properties
Force$\vec F$
Friction coefficients$\mu_k$, $\mu_s$
Stiffness / spring constant$k$
New phenomena
Kinetic friction (Amontons' law)$f_k=\mu_k n$
Static friction$f_s\leq \mu_s n$
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$$\sum\vec F=m\vec a$$