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प्रश्न
Name six simple machines. Give an example of each machine.
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उत्तर
Simple Machines and their examples are as follows:
- The lever: Examples are a crowbar, claw hammer, a pair of pliers, etc.
- The Inclined plane: Examples are ramp, staircase, hilly roads, etc.
- The wedge: Examples are knife, axe, plough, nail, etc.
- Screw: Examples are A screw.
- The wheel and axle: Examples are steering wheel of a car, bicycle pedal, etc.
- The pulley: Examples are a pulley used in raising a load.
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संबंधित प्रश्न
What do you understand by a machine?
Answer the following.
What do you understand by a complex machine?
Answer the following in short.
Mention any two methods by which we can take care of machines.
Fig show a system of four pulleys. The upper two pulleys are fixed and the lower two are movable.
(i) Draw a string around the pulleys. Also show the place and direction in which the effort is applied.
(ii) What is the velocity ratio of the system?
(iii) What is the mechanical advantage of the system?
(iv) What assumption do you make in arriving at your answer in part (iii)?
Define Velocity Ratio
What is the efficiency of an ideal machine?
Comment on the statement ‘The mechanical advantage of a machine is greater than 1’. Give an example of a lever mechanical advantage is:
(i) greater than 1.
(ii) Equal to 1.
Classify the following as a lever, a pulley and an inclined plane:
A needle
Rearrange the letters and find out the name of the tool.
R L E V E
| ______ | ______ | ______ | ______ |
Name some simple machines.
