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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. - **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. - **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 ### Friction
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.
<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: Non-contact forces: