?Trying to calculate the pressure on a bike when you jump a ramp ect.

Assuming the bike lands on a horizontal surface, we can make a fairly good estimate if we know the vertical distance from the apex of the jump to the point of contact. If we know that distance (s), the vertical velocity (v) at impact is given by:

v = √(2gs) where g is the acceleration due to gravity.

If we know the mass of the bike and rider, we can estimate the force based on some assumptions about how quickly the combined mass decelerated, and from that calculate various pressures.

It gets quite a bit more complicated if the bike lands on a downslope. In that situation, we do need to know the forward velocity of the bike and the incline of the landing ramp. Those factors can make an enormous difference. If they are set up "just right" the bike can land with almost no impact at all. This probably explains why most daredevil jumpers never land on a horizontal surface [

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