Torque and Moment of Inertia

Torque

What is Torque?

• Torque is the force that causes an object to rotate

• The formula for Torque is:

   $\tau$ = r x F  

Multiple Choice

A wrench is used to tighten a nut. A 15N perpendicular force is applied 50cm away from the axis of rotation, and moves a distance of 10 cm as it turns. What is the torque applied to the wrench?

• 7.5 Nm
• 1.5 Nm
• 750 Nm
• 150 Nm

Multiple Select

If F is force and r is the radius vector, then torque is given by

• r x F

• r.F

• F x r

• none of these

Multiple Choice

What is the Unit for Torque

• Nm
• N
• W
• J

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