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PE Structural (SE) Physics — practice by topic

Browse 30 questions across 5 Physics topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Physics topics

Mechanical Engineering (30)Mechanics (30)Physics (30)Rotational Motion (30)Rotation and Torque (30)

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An engineer records the angular position of a shaft. The unit used is the:Read the answer and worked solution →Because it is a ratio of two lengths, the radian measure is:Read the answer and worked solution →The time rate of change of angular position is the angular:Read the answer and worked solution →Angular velocity is measured in radians per:Read the answer and worked solution →

Worked practice questions

An engineer records the angular position of a shaft. The unit used is the:

  1. Radian
  2. Rankine
  3. Rontgen
  4. Roebling
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Correct answer: A. Radian

1. Angular position measures how far around the shaft has turned. 2. The standard angular unit comes from arc length over radius. 3. That unit is the radian. _Source: OpenStax University Physics Volume 1, Chapter 10, Fixed-Axis Rotation._

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Because it is a ratio of two lengths, the radian measure is:

  1. Discontinuous
  2. Dimensionless
  3. Directionless
  4. Displacement
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Correct answer: B. Dimensionless

1. Arc length and radius are both measured in metres. 2. Dividing one by the other cancels the units. 3. So the radian is dimensionless. _Source: OpenStax University Physics Volume 1, Chapter 10, Fixed-Axis Rotation._

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The time rate of change of angular position is the angular:

  1. Velocity
  2. Volume
  3. Voltage
  4. Viscosity
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Correct answer: A. Velocity

1. The angle swept changes as the body turns. 2. How fast it changes is the quantity wanted. 3. That quantity is angular velocity. _Source: OpenStax University Physics Volume 1, Chapter 10, Fixed-Axis Rotation._

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