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phys: add friction

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eggy 2020-10-24 14:16:54 -04:00
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commit 8fa56338b8
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docs/sph3u7.md
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@ -345,10 +345,13 @@ Contact (the two objects are touching) forces:
- **Drag** ($\vec{F_D}$) is the resistive force caused by fluids in the path of an object. Its vector is always pointing in the opposite direction of the object's *instantaneous* velocity.
- **Thrust** ($\vec{F_T}$) is the propulsive force caused by mass (usually fluids) being ejected from an object. The force vector always points opposite the direction of the ejected mass.
!!! note
Static friction is always equal to the force applied by another object until an object begins to slip, at which point kinetic/dynamic friction applies. Kinetic friction is a constant force that is lower than the peak force of static friction.
### Friction
<img src="/resources/images/static-kinetic-friction.png" width=500>(Source: Kognity)</img>
Static friction is always equal to the force applied by another object until an object begins to slip, at which point kinetic/dynamic friction applies. Kinetic friction, also known as **dynamic friction**, is a constant force that is lower than the peak force of static friction.
The **coefficient of friction** ($\mu$) represents the ratio between friction force and normal force, and has a different value for kinetic and static friction. The **maximum** force of static friction is equal to its coefficient multiplied by the normal force ($|F_{fS}|_{\max} = \mu_s F_N$), while the force of kinetic friction is equal to its coefficient multiplied by the normal force ($F_{fK} = \mu_k F_N$).
<img src="/resources/images/static-kinetic-friction.png" width=500>(Source: Kognity)</img>
Non-contact forces: