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  • Objects in equilibrium (ie no net forces) continue to go in the direction and speed they were already heading. Forces are only needed to change direction.

  • On the bend at speed, the rider is not in equilibrium - they are accelerating towards the centre of the turn radius. The centripetal force is R(h) in the diagram, the horizontal component of R.

    @M_V

    There doesn't appear to be any force pushing the rider to make a wider turn

    You could draw a force diagram with respect to the rider's own frame of reference while cornering, and then there would be an apparent centrifugal force. It's cancelled by R(h) if they stay on their line; if it's greater than R(h) they are drifting out/up.

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