Perpendicular Forces

Torque

Moment of a force

• The quantity which tells us about the turning effect of a force is its moment.

Moment dependency

• The moment of a force depends on two quantities:

  ■ the magnitude of the force (the bigger the force, the greater its moment)

  ■■ the perpendicular distance of the force from the pivot (the further the force acts from the pivot, the greater its moment).

Multiple Choice

The easiest way to open a heavy door  is by applying the force

• Near the hinges
• In the middle of the door
• At the edge of the door far from the hinges
• At the top of the door

Moment of force (torque)

The component of applied force to a perpendicular distance produces a torque.

Torque is the rotational equivalent of linear force.

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Multiple Choice

What is the Unit for Torque

• Nm

• N

• W

• J

Multiple Choice

A wrench is used to tighten a nut. A 15N perpendicular force is applied 50cm away from the axis of rotation. What is the torque applied to the wrench?

• 7.5 Nm

• 1.5 Nm

• 750 Nm

• 150 Nm

Net torque

Net torque means calculating the resulting torque from ​different contributing forces.

 $\Sigma\tau=\tau_1+\tau_2+...$   

clockwise torque contributes negative torque, 
counterclockwise torque contributes positive torque.