When jumping straight down you can be seriously injured if you land stiff legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 50kg man just before contact with the ground has a speed of 5 m/s A) in a stiff legged landing he comes to a halt in 2.0 ms. Find the average net force that acts on him during this time. B) when he bends his knees he comes to a halt in .10s. Find the average net force that acts on him during this time. C) during the landing, the force of the ground on the man points upward , while the force due to gravity points downward. The average net force acting on the man includes both of these forces. Taking into account the directions of the forces, find the force of the ground on the man in parts A and B

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.