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 Homework Statement

This diagram shows a weightlifter in the initial
stages of his lift. He lifts a weighted bar which
has a 70 kg mass disc on each end and the cross
bar has a mass of 10 kg.
Given g = 9.8 N kg!!
b. Calculate the total weight that he is lifting.
c. During the lift, one of his hand applies a force of 795 N and the other applies a force of
810 N. Calculate the size of the acceleration of the weights during the lift.
The weightlifter asks his assistant to add
more weight to the bar. The assistant lifts
the left end first and adds more weight.
He then lifts the right end and does the
same – as shown in the diagram.
This sketch is a simplified diagram with the forces and distances.
d. (i) Use the information in the diagram above to calculate the size of the force used to lift the
right end of the bar.
 Homework Equations
 Don't know.
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