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प्रश्न
Give a reason for the following.
Machines are able to make our work convenient.
उत्तर
Machines help us to perform the same amount of work with much less effort than if we did the work manually. They also make our work faster and easier by multiplying the speed or the force applied.
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संबंधित प्रश्न
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.
A machine is 75% efficient’. What do you understand by this statement?
Answer the following in short.
Mention any two methods by which we can take care of machines.
What is an inclined plane?
Write the relation between mechanical advantage, velocity ratio and efficiency.
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)?
Classify the following as a lever, a pulley and an inclined plane:
A staircase
The ______ in the centre, the ______ on one side and the ______ on the other side make a lever of the first order.
The ______ in the centre, the ______ on one side and the ______ on the other side make a lever of the second order.
Why is this so traveller’s bags have wheels?
