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Homework Statement
Draw graphs of weight against time for the following
1) man stands on scale very gently and then gets off again very gently
2) man jumps onto scales and then jumps off again
3) man stands on scale and let's his knees unlock so that he drops, then stops.
For each of these describe the reasoning behind the graph.
Homework Equations
mg = R
Resultant force causes an acceleration F=ma
The Attempt at a Solution
1)A slow acceleration possibly constant velocity of approach means the change in weight over time is small and the maximum weight is equal to the weight of the man
2)The man is originally accelerating downwards therefore the reaction force provided by the scales must increase therefore a simulated increase in weight. Vice-versa for jumping upwards
3)Weight must decrease before returning to original weight
My attempts at the graphs are attached going 1 -> 3, left to right. I'm not sure about 2 and 3 as I think I contradict myself
Thanks for the help