Torque and Equilibrium by Jared Rovny, PhD

Name: Torque and Equilibrium
Uploaded: 2016-12-16
Duration: 6 min 30 s
Description: The lecture Torque and Equilibrium by Jared Rovny, PhD is from the course Equilibrium.

About the Lecture

The lecture Torque and Equilibrium by Jared Rovny, PhD is from the course Equilibrium.

Included Quiz Questions

In the equation for torque, τ = rF sin(θ), what does r stand for?

The distance between the center of rotation and the point which the force is applied
The perpendicular distance between the center of rotation and the line of force
The distance from the center of mass of the object being rotated to the center of rotation
The length of the object being rotated
The distance from the center of rotation to the line perpendicular to the line of force

When will the torque applied to be maximized for a given distance r and force magnitude F?

When the angle between the force line and the line connecting the pivot point to the point which the force is applied is 90 degrees
When the angle between the force line and the line connecting the pivot point to the point which the force is applied is 0 degrees
When the angle between the force line and the line connecting the pivot point to the point which the force is applied is 45 degrees
Since torque only depends on the distance r and force magnitude F it is always the maximum
When the force is applied parallel to the line connecting the pivot point to the point which the force is applied

If the distance between the center of rotation and the applied force is 2 meters, and the angle between the force and the distance is 30 degrees, what is the length of the lever arm?

The lever arm is 1 meter
The lever arm is 2 meters
The lever arm is 0.5 meters
The lever arm is 1.5 meters
The lever arm is √3 meters

Why are doorknobs usually placed far away from the pivot point (center of rotation) of the door?

This increases the distance r between the pivot point and where force is applied to the door, increasing the torque
This minimizes the distance r between the pivot point and where force is applied to the door, increasing the torque
The lever arm and force can then be parallel, providing the most torque
The angle between the distance and force is then perpendicular, maximizing the torque
Since after pulling the doorknob it would be easier to pass through the door if the doorknob is placed farther away from the pivot point