Forces - basic physics Gravity Friction - static and kinetic Viscosity

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Presentation transcript:

Forces - basic physics Gravity Friction - static and kinetic Viscosity Springs (Hooke’s law) Damping

Friction Supporting object Fs Resting contact F FN Normal force Static friction Fs Resting contact F Normal force FN

Friction Supporting object Kinetic friction Fk v Resting contact F FN Normal force Static friction

Gravity

Viscosity kv - depends on shape of object n - depends on properties of liquid For spherical object: Terminal velocity - viscosity and gravity balance E.g., for sphere:

Springs (Hooke’s law) Spring’s rest length: exerts zero force x xrest

Spring Mesh Edges => springs Internal springs to stabilize shape

Damping Calm down spring oscillations

Forces - Recap Based on position: springs, gravity, wind, Based on velocity: viscosity, dampers, Based on other forces: static and kinetic friction Give rise to accelerations Based on object interactions: collisions, friction

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