Question

39. A jogger generates an impulse on the ground during the time from initial contact (heel strike) to foot lift off (toe .Total Measured Vertical Impulse __ Estimated Vertical Impulse Force INI 2000..- 1000 Time [s 0 0.2 0.8 1 Heel Strike Toe Off . The vertical force component for heel-toe running typically has two peaks, the first due to iniial heel (or toe) impact on the ground and the second when the foot supports full body weight. The shape and magnitude of the impulse curve for walking, jogging, or running is affected by running speed, material properties and shape of the shoe sole and heel, and running style. .If an athlete were to simply stand on the ground, the due to the athlete's mass is, Gravitational Impulse = Force x time (mg) x (t). This is the "baseline" value that must be subtracted from any activity to arrive at the net impulse of the activity itself. This principle can be expressed as: Net Impulse = Gross impulse generated Measured Impulse - Gravitational Impulse Given: mass of jogger m -75 kg, initial (t 0) downward contact velocity of the foot at heel strike is VHs -5 m/s. Task (a) What is the Gross vertical impulse generated from heel b) What is the Gravitational vertical impulse component (c) What is the Net vertical impulse due to heel strike/toe off d Find the upward vertical toe-off velocity Vo of the foot strike to toe off? due to the jogger's weight? activity? at t- sec, due to the Net impulse
Problem 39.

Answer 1

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