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प्रश्न
Name some simple machines.
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उत्तर
Simple machines are pulley, wedge, inclined plane, screw, lever, wheel, and axle.
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संबंधित प्रश्न
Fill in the blank:
The useful work done by an actual machine is always ............ than the work done on the machine.
Answer the following.
What do you understand by a complex machine?
Give a reason for the following.
Machines are able to make our work convenient.
The mechanical advantage of an inclined place is always:
(a) less than 1
(b) equal to 1
(c) greater than 1
(d) nothing can be said
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)?
Give scientific reason for the following:
Passengers in a bus are pushed backward when it starts suddenly.
Give an example of the following use of a machine to obtain gain in force.
(i) Calculate the mechanical advantage of the lever shown in the figure.
(ii) How do you define the mechanical advantage of a machine?
Classify the following as a lever, a pulley and an inclined plane:
A needle
Which machine will you use to do the following work? Write their type.
To hold a papad for roasting it.
