A physics problem that require a diagram with torques.

timer Asked: Aug 27th, 2015

Question description

A skateboarder is balancing on a rail with their board horizontal. The rail is positioned along the board such that it is 25 cm from the skater’s left foot and and 50 cm from the skater’s right foot (assume the skater’s feet are positioned at the ends of the board). 20 kg of the skater’s mass is positioned over their right foot and the total mass of the board (which is evenly distributed along the board) is 3 kg. (a) Draw a free-body diagram for the skateboard. (b) Assuming the skateboard is in equilibrium, calculate the mass of the skater positioned over the left foot and hence the skater’s total mass. (c) The skater jumps onto a new rail such that their board is again horizontal. If 30% of their mass is positioned over their left leg, how far from the skater’s left leg must the rail (fulcrum) be in order for the skater to be balanced? 

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