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प्रश्न
Which machine will you use to do the following work? Write their type.
To lift bricks to the top of a tall building.
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उत्तर
To lift bricks to the top of a tall building, we should use a crane, which is a pulley.
संबंधित प्रश्न
Define the term ‘work input’ and ‘work output’ in relation to a machine.
A machine is 75% efficient’. What do you understand by this statement?
Derive the relationship between mechanical advantage, velocity ratio and efficiency of a machine.
State the kind of lever which always has mechanical advantage less than 1. Draw a labelled diagram of such a lever.
A crowbar of length 120 cm has its fulcrum situated at a distance of 20 cm from the load. Calculate the mechanical advantage of the crowbar.
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 Simple machine
Write an expression for the mechanical advantage of an inclined plane.
Simple machines makes work easier by trading ______ for force.
Name a machine for each of the following uses:
- to multiply the force,
- to change the point of application of force,
- to change the direction of force,
- to obtain the gain in speed.
