Grade 10 Physics · Strand 1: Mechanics and Thermal Physics · Energy, Work, Power and Machines
Pulleys and Pulley Belt Systems
A short Grade 10 Physics lesson for the CBE curriculum, part of Mechanics and Thermal Physics: Energy, Work, Power and Machines. Learn it on any phone with notes and slides, then check yourself with a quick quiz and earn XP. This lesson is free.
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1. A single fixed pulley is used to draw water from a borehole in Machakos. What is the main advantage of using it?
- A. It changes the direction of the effort
- B. It halves the effort needed
- C. It doubles the distance the load moves
- D. It makes the bucket lighter
2. A builder uses a single movable pulley (VR = 2) to lift a 600 N bag of cement. Because of friction, he needs an effort of 400 N. Calculate the efficiency of the pulley as a percentage.
Type your answer (in %) in the lesson.
3. A block and tackle has 4 rope strands supporting the movable block, so its VR is 4. How many metres of rope must be pulled through to raise the load by 2.5 m?
Type your answer (in m) in the lesson.
4. Why does the efficiency of a pulley system usually fall as more pulleys are added?
- A. The velocity ratio becomes zero
- B. More friction at the axles and a heavier lower block must be lifted
- C. The load becomes heavier
- D. The rope no longer supports the load
5. In a belt drive on a posho mill, the driver pulley has a diameter of 10 cm and the driven pulley has a diameter of 20 cm. How does the driven shaft turn compared with the driver?
- A. Twice as fast
- B. At the same speed
- C. At half the speed
- D. Four times slower
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