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Physics

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skjsaurabh edited this page Apr 14, 2013 · 12 revisions

Description

To be a successful framework we need to incorporate support for physics in our framework. This discussion paper aims to provide a forum for OpenClass members to provide their inputs on physics support within our framework.

Key Things

  • Position :

  • 2D : x,y

  • 3D : x,y,z

  • Distance :

  • 2D : The distance between (x1, y1) and (x2, y2) is given by: 2D distance formula

  • 3D : Given points (x1, y1, z1) and (x2, y2, z2) in three-space, the distance between them is: 3D distance formula

  • Day to day usage : Distance = Speed X Time

  • Speed

  • Speed = Distance / Time

  • Acceleration

  • Rate of change in speed

  • Center of Gravity

  • Gravity

  • The acceleration of an object due to gravitational force is independent of the mass of the object

  • Earth's gravitational acceleration : 9.81 m/second square

  • Friction

  • Friction is the force that resists motion between two contacting surfaces

  • Friction occurs between all types of matter - solids, liquids, and gases—and is an important component in many physical models.

  • One of the consequences of friction is heat

  • the amount of friction between two objects depends on what the materials of the two objects are

  • Another general observation about friction is that it is proportional to the normal force between the contacting surfaces

  • Friction Formula (friction against earth's pull) : coefficient of friction x mass x gravity x cos theta (angle of object on a ramp)

  • coefficient of friction : The friction force is also a function of the material properties of the two objects in contact with each other. This is quantified by 'coefficient of friction'. Another characteristic about friction is that objects in motion generally have a lower coefficient of friction than do objects at rest. When modeling the effects of friction, two coefficients of friction must be taken into account.

  • The direction of the force of friction an object experiences is always in the opposite direction to any net external force applied to the object

  • Another interesting thing about friction is that, in a sense, it is a variable magnitude force. Friction will counterbalance an externally applied force up to a maximum possible level defined by the above formula.

  • Force

  • Angular Velocity

  • Mass

  • Drag

  • Inertia

  • Buoyancy

  • Rotation

  • Scaling

  • Density

  • Restitution

  • Joints

  • Plane

  • Viscosity

  • Pressure

  • Collision

  • Spring

  • Centripetal force

  • Normal force

  • The normal force exerted by an object is the component of the force vector normal, that is, perpendicular, to the surface that is in contact with the object

Note : Portions of this text are based on Wikipedia and other external sources.

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