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प्रश्न
Complete the table.
| S. No | Types of Simple Machine | Example |
| 1. | Pulley | |
| 2. | Wheel and axle | |
| 3. | Wedge | |
| 4. | Inclined plan | |
| 5. | Lever | |
| 6. | Screw |
उत्तर
| S. No | Types of Simple Machine | Example |
| 1. | Pulley | crane |
| 2. | Wheel and axle | bicycle, grinder |
| 3. | Wedge | knife, scissors, axe |
| 4. | Inclined plan | ramp, slide, and slope for wheel chair |
| 5. | Lever | see saw, nut cracker, and plier |
| 6. | Screw | pencil sharpener, screw- jack, bottle cap, windmill |
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संबंधित प्रश्न
A boy uses a single fixed pulley to lift a load of 50 kgf to some height. Another boy uses a single movable pulley to lift the same load to the same height. Compare the effort applied by them. Give a reason to support your answer.
Draw a neat labelled diagram showing a pulley being used to lift a load. How are load and effort related in an ideal situation?
What is a gear system ?
Explain how a gear system can be used to obtain Change in direction of rotation. Given one example.
Differentiate between a single fixed pulley and a single movable pulley.
A block and tackle pulley system has a velocity ratio 5. Draw a labelled diagram of this system. In your diagram, indicate clearly the points of application and the directions of the load and effort.
Give reason for the following:
In case of a block and tackle arrangement, the mechanical advantage increases with the increase in the number of pulleys.
Give reason for the following:
The efficiency of a pulley is always less than 100%
What is a block and tackle system of pulleys?
The alongside figure shows the combination of a movable pulley P1 with a fixed pulley P2 used for lifting up a load W.
(i) State the function of the fixed pulley P2.
(ii) If the free end of the string moves through a distance x, find the distance by which the load W is raised.
(iii) Calculate the force to be applied at C to just raise the load W = 20 kgf, neglecting the weight of the pulley P1 and friction.
