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प्रश्न
State whether the following statement is True or False.
A machine performs work by itself.
पर्याय
True
False
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उत्तर
False
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संबंधित प्रश्न
What do you understand by a machine?
The diagram below shows a wheel barrow. Mark position of fulcrum F and draw arrows to show the directions of load L and effort E. What class of lever is the whell barrow? Give one more example of the same class of lever.
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 Mechanical advantage
Fig. shows a spade. It is being used to lift soil weighing 30N from the ground.
(a) Mark the direction of the least force on the handle necessary to keep the spade balanced.
(b) Calculate the least force on the handle necessary to keep the spade balanced (the weight of the spade is negligible).
(c) If the left hand was move towards the soil on the spade, would the force on the handle necessary to keep the soil balance the greater or less? Give a reason for your answer.
(d) To which class of lever does the spade belong?
A uniform metre scale is kept in equilibrium when supported at the 60 cm mark and a mass M is suspended from the 90 cm mark as shown in the figure. State with reasons, whether the weight of the scale is greater than, less than or equal to the weight of mass M.
Classify the following as a lever, a pulley and an inclined plane:
Nutcrackers
Identify and mention the types of simple machines.
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 |
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| ______ | ______ | _______ |
 |
 |
 |
| ______ | ______ | ______ |
Name some simple machines.
The idea of a simple machine originated with the Greek philosopher Archimedes.
