14. Torque & Rotational Dynamics

Torque on Discs & Pulleys

Calculating Net Torque Example Problem - disk rotating

Example Net Torque on a disc

The composite disc below is free to rotate about a fixed axis, perpendicular to it and through its center. All forces are 100 N, and all angles are 37°. The dotted lines are either exactly parallel or exactly perpendicular to each other. The inner (darker) and outer (lighter) discs have radii 3 m and 5 m, respectively. Calculate the Net Torque produced on the composite disc, about an axis perpendicular to it and through its center. Use +/– to indicate direction.<img src="https://static.studychannel-prd.pearsonprd.tech/courses/physics/thumbnails/images/224695d6"alt=""/>

Physics - Application of the Moment of Inertia (5 of 11) Object Hanging From a Rotating Disk

Torque On a Pulley Example

Net Torque on a disc

A rope is wrapped around a pulley and two blocks (A and B) are attached to the two ends of the rope, and <math display=“inline”><mrow><msub><mi>m</mi><mtext>A</mtext></msub><mo>=</mo><mrow><mn>2.4</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">kg</mi></mrow></mrow></math> and <math display=“inline”><mrow><msub><mi>m</mi><mi mathvariant="normal">B</mi></msub><mo>=</mo><mrow><mn>3.7</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">kg</mi></mrow></mrow></math>. The pulley itself can be modeled as a solid cylinder with radius 4.5 cm, and mass <math display=“inline”><mrow><msub><mi>m</mi><mrow><mtext>cyl</mtext></mrow></msub><mo>=</mo><mrow><mn>2.6</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">kg</mi></mrow></mrow></math>. What is the magnitude of the acceleration of block A?

A square with sides 4 m long is free to rotate around an axis perpendicular to its face and through its center. All forces shown are 100 N and act simultaneously on the square. The angle shown is 30°. Calculate the Net Torque that the forces produce on the square, about its axis of rotation.<img src="https://static.studychannel-prd.pearsonprd.tech/courses/physics/thumbnails/images/9016404f"alt=""/>

Physics - Application of the Moment of Inertia (6 of 11) Acceleration=? When Pulley Has Mass (mu=0)

2 Masses on a Pulley - Torque Demonstration

31.5 Massive Pulley Problems

Suppose a force <math display=“inline”><mi>F</mi></math> is applied tangentially to the edge of a solid cylinder of radius <math display=“inline”><mi>R</mi></math> and mass <math display=“inline”><mi>M</mi></math>. causing an angular acceleration <math display=“inline”><mi>&#x03B1;</mi></math>. If the same force is applied tangentially to a solid sphere also of radius <math display=“inline”><mi>R</mi></math> and mass <math display=“inline”><mi>M</mi></math>. what will be the angular acceleration?

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Torque & Acceleration (Rotational Dynamics)

How to Solve:Energy vs Torque

How to Solve: Energy vs Torque

Net Torque & Sign of Torque

Torque Due to Weight

Intro to Torque

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