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This demonstration shows the statics problem of a block placed on an incline. The block changes colour when it should slide and unlike the previous version the block actually slides.


CONTROLS

• Use the scroll bar on the side to change the angle of the incline.
  
• Enter a new mass or coefficent of friction in the textbox and click the enter button to initialize them.
• To reset the scene wait until the block has finsihed sliding, then press the "Reset" button.

DEMO DESCRIPTION

• As can be seen in the above example as you change theta, the friction force down the incline and normal force change accordingly while the force due to gravity changes direction, but maintains a constant magnitude.
• As soon as the friction force is is smaller than the force down the incline, the block slides. For now this is represented by the block changing colour.
• In order to keep the problem as simple as possible, the co-ordinate system rotates with the incline. This means that the normal force only has a Y component and the friction and down incline forces only have an X component. This saves some time when solving this problem.
• Changing the Mu (coefficient of friction) changes the size of the friction force.