AP Physics 1: Algebra-Based 5.3 A Identify the Torques Exerted on a Rigid System Questions

Practise AP Physics 1 5.3.A by deciding whether forces on beams, disks, and orbiting objects produce torque about a chosen pivot or rotation axis.

Exam points

Decide whether a force on a beam or disk exerts torque by tracing its line of action to the pivot.
Explain zero torque for a radial force and nonzero torque from a component perpendicular to r.

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Figure for Question AP Physics 1: Algebra-Based 5.3 A Identify the Torques Exerted on a Rigid System Questions question 1 — AP Physics 1: Algebra-Based

8 points; suggested time: 15-20 minutes A mass m is initially resting at the center of a rotating disk with rotational inertia $(1 / 2) M R^{2}$ . The entire system is freely rotating with an initial angular speed of $w_{0}$ . As time goes by, the mass is carefully moved at a constant speed outward from the center. This is done in such a way that no torque on the system is introduced.

How can one push the small mass m such that no torque is induced?

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AP Physics 1: Algebra-Based 5.3 A Identify the Torques Exerted on a Rigid System Questions question 1