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प्रश्न
Classify the following as a lever, a pulley and an inclined plane:
Scissors
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उत्तर
Scissors – A lever
संबंधित प्रश्न
State whether the following statement is True or False.
A machine performs work by itself.
State whether the following statement is True or False.
In an ideal machine, work done on load is equal to the work done by effort.
What is the purpose of a jack in lifting a car by it?
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.
Define efficiency.
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.
Which machine will you use to do the following work? Write their type.
To remove the lid of a tin.
Why is this so traveller’s bags have wheels?
