Motion under different kinds of force
1. Left-click the red object and drag a velocity (red) vector out from it. If unsuccessful, press "Reset" and try again.
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2. Left-click the red object again and drag an acceleration (blue) vector out from it.
3. When the red object is not moving, the two vectors can be modified by left-dragging their heads.
4. Translate the whole system by right-dragging (or control-dragging) the red object.
5. After the velocity and acceleration are created, select the force that acts on the red object.
6. When the "central force" is selected, a gray dot will appear. This is the centre of the central force. You can drag the gray dot to a new position.
7. To refresh the black dots on the locus, uncleck "Show locus" and check it again.
Bertrand's theorem:
In central force motion, the orbits are closed only for inverse square law and Hooke's law.
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| The horizontal component of the tension in the rope provides the centripetal force. | The horizontal component of the lifting force acting on the wings of an aeroplane provides the centripetal force for its turn. |
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