Advertisements
Advertisements
प्रश्न
Why is this so traveller’s bags have wheels?
Advertisements
उत्तर
A traveler's bag has wheels so that it can be dragged easily because of reduced friction between the ground and the wheel. Thus, the wheel, a simple machine, helps to decrease the effort to be applied to the load, which is a bag here.
संबंधित प्रश्न
Name six simple machines. Give an example of each machine.
Define the term ‘work input’ and ‘work output’ in relation to a machine.
Why is a machine not 100% efficient?
Write an expression for the mechanical advantage of an inclined plane in terms of its length I and vertical height h.
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 Efficiency
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.
What is the efficiency of a machine?
Which machine will you use to do the following work? Write their type.
To cut vegetables.
The idea of a simple machine originated with the Greek philosopher Archimedes.
