Introduction to Moments and Turning Effects

Try these questions

5 questions from this lesson’s quiz. Start the lesson to answer them and see the right answers.

1. 1. What is meant by the moment of a force?

   • A. The turning effect of a force about a pivot
   • B. The time taken for a force to act on a body
   • C. The push or pull that moves a body in a straight line
   • D. The fixed point about which a body rotates

2. 2. A mechanic applies a force of 40 N at right angles to a spanner at a perpendicular distance of 0.30 m from the nut. Calculate the moment of the force about the nut.

   Type your answer (in N m) in the lesson.

3. 3. Wanjiru finds it hard to open a heavy door when she pushes close to the hinges. She finds it much easier when she pushes at the handle. Why?

   • A. The handle is further from the pivot, so the same force gives a larger moment
   • B. The door becomes lighter at the handle
   • C. The force is smaller at the handle, so the moment is smaller
   • D. The hinges produce a larger force when she pushes near them

4. 4. Kamau uses a crowbar 0.8 m long to prise up a floorboard. He applies a force of 50 N perpendicularly at the end of the crowbar, measured from the pivot. Calculate the moment about the pivot.

   Type your answer (in N m) in the lesson.

5. 5. What name is given to the fixed point or axis about which an object turns?

   Type your answer in the lesson.

More in Moments and Equilibrium

• ▸Anomalous Expansion of Water
• ▸Thermal Expansion of Gases
• ▸Thermal Expansion in Matter
• ▸Revision and Practical Assessment of Thermal Phenomena
• ▸The Principle of Moments
• ▸Centre of Gravity of Regular and Irregular Laminae
• ▸States of Equilibrium
• ▸Factors Affecting Stability and Structural Design

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