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

Analyse torques on rigid systems by locating each force, resolving its perpendicular component and combining signed moments about a chosen axis.

Syllabus
Effective Fall 2024
Course
AP Physics 1: Algebra-Based

Exam points

  • draw force diagrams showing each force and its point of application relative to the rotation axis
  • calculate torque magnitude from the perpendicular force component and its lever arm
  • combine clockwise and counterclockwise contributions to derive net torque on a beam, disk or pulley
  • rank torque magnitudes when force angle, magnitude or distance from the pivot changes
  • choose a force magnitude or combination that produces zero net torque about a pivot

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

[Maximum number: 3]

(12 points, suggested time 25 minutes)
The left end of a uniform beam of mass M and length L is attached to a wall by a hinge, as shown in Figure 1. One end of a string with negligible mass is attached to the right end of the beam. The other end of the string is attached to the wall above the hinge at Point 1. The beam remains horizontal. The hinge exerts a force on the beam of magnitude FHF_{\mathrm{H}}, and the angle between the beam and the string is θ=θ1\theta=\theta_{1}.

The following rectangle represents the beam in Figure 1. On the rectangle, draw and label the forces (not components) exerted on the beam. Draw each force as a distinct arrow starting on, and pointing away from, the point at which the force is exerted.

Figure 2

Figure 2

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