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# Summary of Interaction 1

You have finished the 1st of the two courses in the Interaction discipline! Continue to to complete the Interaction 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
Momentum$$\vec p$$
Impulse$$\vec J$$
Angular momentum$$\vec L$$
Precession speed$$\omega_\text{precession}$$
New mechanisms
Definitions$$\vec p=m\vec v$$
$$\vec L=I\vec \omega$$ $$\vec L = \vec r \times \vec p$$
$$\vec J=\vec F\Delta t$$ $$\vec J=\Delta \vec p$$
Newton's 3rd law$$\vec F_\text{A on B}=-\vec F_\text{B on A}$$
"Speed difference" conservation$$\Delta v_\text{before}= -\Delta v_\text{after}$$
(Angular) momentum conservation$$\sum \vec p_\text{before}= \sum \vec p_\text{after}$$
$$\sum \vec L_\text{before}= \sum \vec L_\text{after}$$
New phenomena
Elastic & inelastic collisions
Mechanical pain$$\Delta \vec a_\text{body parts}$$
Precession$$\omega_\text{precession}=\frac{wr}{L_\text{spin}}$$
Rotational stability (gyroscope)