Practice Torque in Physics
Use these practice problems to test your method after reviewing the concept explanation and worked examples.
Quick Recap
The rotational equivalent of force; a measure of how much a force tends to cause an object to rotate about an axis.
How hard you're twisting something. Depends on force AND distance from pivot.
Example 1
easyA force of 20 \text{ N} is applied at the end of a 0.5 \text{ m} wrench, perpendicular to the wrench. What is the torque produced?
Example 2
mediumA 3 \text{ m} seesaw has a pivot at its center. A 30 \text{ kg} child sits at one end. How far from the center must a 45 \text{ kg} child sit to balance the seesaw? Use g = 9.8 \text{ m/s}^2.
Example 3
mediumA 30 N force is applied at the end of a 0.4 m wrench at 60\u00b0 to the handle. Calculate the torque.
Example 4
mediumA door (1 \text{ m} wide) requires 50 \text{ N m} of torque to open. What force must be applied at the edge of the door, perpendicular to it?
Example 5
hardA 40 \text{ N} force is applied to a 0.8 \text{ m} lever arm at an angle of 60° to the lever. What is the torque? How does this compare to the maximum possible torque with the same force?