Torque, Couples and Resolution of Forces

Try these questions

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

1. 1. Which of the following correctly describes a couple?

   • A. Two unequal forces acting in the same direction along one line
   • B. Two equal forces acting in the same direction at different points
   • C. Two equal, parallel and opposite forces whose lines of action do not coincide
   • D. Two equal and opposite forces acting along the same line

2. 2. A matatu driver turns the steering wheel by applying two equal and opposite forces of 12 N to the rim. The wheel has a diameter of 0.45 m. Calculate the torque of the couple.

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

3. 3. Why does a couple produce pure rotation without making the object accelerate in a straight line?

   • A. Because the two forces act at the same point
   • B. Because the two equal and opposite forces give a resultant force of zero
   • C. Because the forces are added together to give 2F
   • D. Because the perpendicular distance between the forces is zero

4. 4. Wanjiru pulls a garden roller with a force of 80 N along a handle inclined at 60° to the horizontal ground. Find the horizontal component of the force that pulls the roller forward. (cos 60° = 0.5, sin 60° = 0.866)

   Type your answer (in N) in the lesson.

5. 5. What is the name for splitting one force into two perpendicular components?

   Type your answer in the lesson.

More in Moments and Equilibrium

• ▸Centre of Gravity of Regular and Irregular Laminae
• ▸States of Equilibrium
• ▸Factors Affecting Stability and Structural Design
• ▸Parallel Forces and Multiple Supports
• ▸Practical Applications and System Consolidation
• ▸Forms of Energy & Conservation
• ▸Concept and Measurement of Work
• ▸Power and the Rate of Doing Work

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