Problem: A circular air hockey puck of radius r slides across a frictionless air hockey table and is subjected to several forces as shown below. The magnitude and direction of each force is given. Forces are applied at either the center of mass of the puck, the outer edge (a distance r from the center), or a distance halfway (r/2) between the center and the outer edge. Select the examples below that have a net torque of zero about the axis perpendicular to the page and extending from the center of the puck.

🤓 Based on our data, we think this question is relevant for Professor Spurlock's class at UTA.

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Torque, τ,

τ=F·rsin θF

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Problem Details

A circular air hockey puck of radius r slides across a frictionless air hockey table and is subjected to several forces as shown below. The magnitude and direction of each force is given. Forces are applied at either the center of mass of the puck, the outer edge (a distance r from the center), or a distance halfway (r/2) between the center and the outer edge. 

Select the examples below that have a net torque of zero about the axis perpendicular to the page and extending from the center of the puck.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Net Torque & Sign of Torque concept. You can view video lessons to learn Net Torque & Sign of Torque. Or if you need more Net Torque & Sign of Torque practice, you can also practice Net Torque & Sign of Torque practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Spurlock's class at UTA.