Researchers often use force plates to measure the forces that people exert again

Question

Researchers often use force plates to measure the forces that people exert against the floor during movement. A force plate works like a bathroom scale, but it keeps a record of how the reading changes with time. The figure shows the data from a force plate as a woman jumps straight up and then lands. jfk.Figure.05.U44EOC.jpg Kimberly Van Andel Part A - What was the vertical component of her acceleration during push-off? a = { m m/s^2} submitshow answer Part B - What was the vertical component of her acceleration while in the air? a = { m m/s^2} submitshow answer Part C - What was the vertical component of her acceleration during the landing? a = { m m/s^2} submitshow answer Part D - What was her speed as her feet left the force plate? v = { m m/s} submitshow answer Part E - How high did she jump? h =

Explanation / Answer

yes, these force plates have springs underneath them, and the stiffness of the spring (i.e. spring constant k) tells us how much force is exerted. F = kx So we measure how much the spring is compressed by the force F and we know k, then we can calculate F.

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