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urp:physgen
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| Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
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urp:physgen [2021-10-19] nerf_herder |
urp:physgen [2021-11-11] nerf_herder |
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| Line 4: | Line 4: | ||
| * [[#Collisions]] | * [[#Collisions]] | ||
| * [[#Inclined plane]] | * [[#Inclined plane]] | ||
| - | * [[#Spring and lever]] | ||
| * [[#Projectile fired at an angle]] | * [[#Projectile fired at an angle]] | ||
| * [[#Buoyant force]] | * [[#Buoyant force]] | ||
| Line 76: | Line 75: | ||
| When parallel force > friction, it is unbalanced and objects will move down the plane | When parallel force > friction, it is unbalanced and objects will move down the plane | ||
| Applied force - friction = net force | Applied force - friction = net force | ||
| + | |||
| + | ====Friction==== | ||
| + | Coefficient of friction | ||
| + | * μ = f/N (force applied divided by Normal force) | ||
| + | * fNet = fApp - Ffriction | ||
| static friction - | static friction - | ||
| Line 82: | Line 86: | ||
| N = normal force) must be overcome before the mass moves | N = normal force) must be overcome before the mass moves | ||
| μS = fs/N = m*g*sin(θ) / m*g*cos(θ) = sin(θ)/cos(θ) = tan(θ) | μS = fs/N = m*g*sin(θ) / m*g*cos(θ) = sin(θ)/cos(θ) = tan(θ) | ||
| - | kinetic friction - normal moving friction | + | kinetic friction - moving friction |
| only one type of friction applies at a time | only one type of friction applies at a time | ||
| - | ====Spring and Lever==== | ||
| - | **Hooke's law** for springs: F=-kx, k=spring constant, x = displacement | ||
| - | |||
| - | **Fulcrum**: t = r * f (torque = radius * force) | ||
| - | just add the torques for multiple objects on one side of a fulcrum | ||
| ====Projectile fired at an angle==== | ====Projectile fired at an angle==== | ||
| Line 134: | Line 133: | ||
| vf²= vo² + 2ad | vf²= vo² + 2ad | ||
| vf = v0 + at | vf = v0 + at | ||
| + | |||
| + | |||
| + | ====Optics==== | ||
| + | Refraction on going into a different medium | ||
| + | |||
| + | **Snell's law** | ||
| + | sin(θ₁) / sin(θ₂) = v₁/v₂ = n₂/n₁ (note that the n values are reversed) | ||
| + | v = velocity of light in that medium, n = index of refraction | ||
| + | v = c/n (c = speed of light in a vacuum) | ||
| + | it bends towards the normal direction when entering denser material | ||
| + | (and slows down). bend is because photons are waves. | ||
| + | |||
| + | Critical angle : smallest angle that results in total reflection, no refraction | ||
| + | θc = arcsin(n₂/n₁) | ||
| + | |||
| ====Miscellaneous==== | ====Miscellaneous==== | ||
urp/physgen.txt · Last modified: 2022-02-01 by nerf_herder
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