Question 2

A uniform bar of mass M is supported by a pivot at its top, about which the bar can swing like a pendulum. If a force, F, is applied perpendicularly to the lower end of the bar as in the diagram, how big must F be in order to hold the bar in equilibrium at an angle from the vertical?

• A.     One can't tell without knowing the length of the bar.
• B.     2 M g
• C.     M g / 2
• D.     2 M g sin
• E.     M g sin
• F.     ( M g / 2 ) sin
• G.     2 M g cos
• H.     M g cos
• I.     ( M g / 2 ) cos
• J.     None of the above

Formula Sheet

Question 1

Question 3

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