15. Rotational Equilibrium

Equilibrium with Multiple Objects

Practice Problem: Torque on a Mobile

The Saffold

Two people carry a heavy electric motor by placing it on a light board 2.00 m long. One person lifts at one end with a force of 400 N, and the other lifts the opposite end with a force of 600 N. (a) What is the weight of the motor, and where along the board is its center of gravity located?

Equilibrium with Multiple Objects: Example: Position of second kid on seesaw

A 0.120-kg, 50.0-cm-long uniform bar has a small 0.055-kg mass glued to its left end and a small 0.110-kg mass glued to the other end. The two small masses can each be treated as point masses. You want to balance this system horizontally on a fulcrum placed just under its center of gravity. How far from the left end should the fulcrum be placed?

A 20 kg, 5 m-long bar of uniform mass distribution is attached to the ceiling by a light string, as shown. Because the string is off-center (2 m from the right edge), the bar does not hang horizontally. To fix this, you place a small object on the right edge of the bar. What mass should this object have, to cause the bar to balance horizontally?<img src="https://static.studychannel.pearsonprd.tech/courses/physics/thumbnails/images/5bdcb4af"alt=""/>

Equilibrium with Multiple Objects: Example: Multiple objects hanging

Two kids (m,LEFT = 50 kg, m,RIGHT = 40 kg) sit on the very ends of a 5 m-long, 30 kg seesaw. How far from the left end of the seesaw should the fulcrum be placed so the system is at equilibrium? (Remember the weight of the seesaw!)<img src="https://static.studychannel.pearsonprd.tech/courses/physics/thumbnails/images/6466757a"alt=""/>

Physics, Torque (3 of 13) Balance Beam

Two people are carrying a uniform wooden board that is 3.00 m long and weighs 160 N. If one person applies an upward force equal to 60 N at one end, at what point does the other person lift? Begin with a free-body diagram of the board.

Multiple objects hanging

The system in the figure is in equilibrium with the string

Physics, Torque (13 of 13) Static Equilibrium, Mobile Calculations

Position of second kid on seesaw

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