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NECO SSCE Physics — practice by topic

Browse 33 questions across 1 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

Uniform Circular Motion and Gravitation (33)

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In rotational motion, the rotation angle plays the same role as which linear quantity?Read the answer and worked solution →What does the arc length measure for an object moving on a circle?Read the answer and worked solution →In which unit is angular velocity expressed?Read the answer and worked solution →Two wheels turn for the same time, but one sweeps a larger angle. What follows?Read the answer and worked solution →

Worked practice questions

In rotational motion, the rotation angle plays the same role as which linear quantity?

  1. Linear distance
  2. Linear momentum
  3. Linear density
  4. Linear mass
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Correct answer: A. Linear distance

1. The rotation angle records how much an object has turned about its axis. 2. That is the rotational counterpart of how far an object has travelled in a straight line. 3. So the rotation angle is analogous to linear distance. 4. It is defined as the arc length divided by the radius of curvature. _Source: OpenStax College Physics (CC BY 4.0), Ch 6 "Uniform Circular Motion and Gravitation", section Rotation Angle_

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What does the arc length measure for an object moving on a circle?

  1. The radius of the circular path
  2. The distance travelled along the path
  3. The angle turned through in radians
  4. The time taken for one revolution
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Correct answer: B. The distance travelled along the path

1. Arc length is measured along the curved path itself, not across it. 2. It is therefore the distance travelled by the object as it moves round the circle. 3. Dividing that arc length by the radius of curvature gives the rotation angle. 4. For one complete revolution the arc length equals the circumference of the circle. _Source: OpenStax College Physics (CC BY 4.0), Ch 6 "Uniform Circular Motion and Gravitation", section Rotation Angle_

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In which unit is angular velocity expressed?

  1. Metres per second
  2. Newtons per metre
  3. Radians per second
  4. Degrees per metre
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Correct answer: C. Radians per second

1. Angular velocity is defined as a rotation angle divided by the time taken. 2. The angle is measured in radians and the time in seconds. 3. So the unit of angular velocity is radians per second. 4. Metres per second belongs to linear velocity, which is a different quantity. _Source: OpenStax College Physics (CC BY 4.0), Ch 6 "Uniform Circular Motion and Gravitation", section Angular Velocity_

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