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प्रश्न
Which machine will you use to do the following work? Write their type.
To draw water from a well.
उत्तर
To draw water from a well, we should use a pulley system or wheel-axle.
संबंधित प्रश्न
What do you understand by a machine?
What is the principle on which a machine works?
Why is a machine not 100% efficient?
Derive the relationship between mechanical advantage, velocity ratio and efficiency of a machine.
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)?
What is the relationship between the mechanical advantage and the velocity ratio for:
(i) An ideal machine,
(ii) A practical machine.
Classify the following as a lever, a pulley and an inclined plane:
A crane
The ______ in the centre, the ______ on one side and the ______ on the other side make a lever of the second order.
______ help us to make work easier.
A pair of scissors is a _____ multiplier.
