โš›๏ธ Physics Quiz 8: Torque and Rotational Motion

โš›๏ธ Physics ยท Quiz 008

Move from linear forces to rotational effects through torque, rotational equilibrium, moment of inertia, and angular acceleration.

Learning goalTranslate familiar force and kinematic ideas into their rotational counterparts and introduce torque, equilibrium, and angular acceleration.

  • 5 questions
  • Foundation
  • Explanations after finishing
Answered 0/5
FoundationFor a force F applied at position vector magnitude r from a rotation axis, with angle theta between r and F, which expression gives the torque magnitude?
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Torque depends on force, distance from the axis, and the angle between them.

UnderstandingFor the same force magnitude, which application gives the largest torque magnitude about a pivot?
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Maximize both the lever arm and the perpendicular component of the force.

ApplicationA 20 N force is applied perpendicular to a wrench 0.50 m from the bolt. What torque magnitude is produced about the bolt?
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The force is perpendicular, so the sine factor is one.

InterpretationA 300 N child sits 2.0 m to the left of the pivot on a level seesaw. Where should a 400 N child sit on the right for rotational equilibrium, assuming the seesaw itself is balanced?
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For rotational equilibrium, clockwise and counterclockwise torque magnitudes must balance.

ConnectionA rigid wheel with moment of inertia 3.0 kg m^2 experiences a constant net torque of 12 N m. It starts from rest. What are its angular acceleration and angular speed after 3.0 s?
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Use net torque to find angular acceleration, then use constant-angular-acceleration kinematics.

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