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MathematicalZero vector
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TechnicalNewton's 1st law (no change)
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MathematicalSine & cosine
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Sine & cosine values
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Vector components
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Trigonometry
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TechnicalPseudo-forces
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Reference frames
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Known forces
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Fundamental forces
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Ending of Forces 2Summary of Forces 2
Participants9
You have finished the 2nd third of the Forces discipline! Continue to 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 | $\vec F$ |
| 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 | $$\sum\vec F=m\vec a$$ |