What forces act upon the meter stick? Where should the force of gravity be considered to act? Center of Gravity – the single point on a body where the force of gravity effectively acts. As long as the local gravitational field strength ( g ) is essentially constant, the center of gravity is the same as the center of mass. a.Draw an extended force diagram of the meter stick. Consider a meter stick of mass kg pivoted at one end which is held horizontally by a vertical string.

Do all three force exert torques around the pivot? The Normal Force does not exert a torque because it acts radially (through the axis of rotation)! a.Draw an extended force diagram of the meter stick. Consider a meter stick of mass kg pivoted at one end which is held horizontally by a vertical string.

b.Complete the torque bar graph quantitatively. Consider a meter stick of mass kg pivoted at one end which is held horizontally by a vertical string Nm 0

b.Complete the torque bar graph quantitatively. Consider a meter stick of mass kg pivoted at one end which is held horizontally by a vertical string. 1.5 Nm 0 Since the angular velocity of the meter stick doesn’t change, the torques must be balanced! -1.5 Nm Newton’s First Law!

c.What is the tension in the string? Consider a meter stick of mass kg pivoted at one end which is held horizontally by a vertical string. 1.5 Nm Nm

Static Equilibrium Equilibrium Consider a meter stick of mass 0.25 kg pivoted at one end which is held horizontally by a vertical string.