Advertisements
Advertisements
प्रश्न
State whether the following statement is True or False.
A boy does work while pushing a wall.
Advertisements
उत्तर
This statement is false.
Explanation:
In physics, work is defined as force multiplied by displacement. Pushing a wall requires using force, yet the wall does not move (displacement is zero), hence the labor done is zero.
APPEARS IN
संबंधित प्रश्न
Fill in the blank:
The useful work done by an actual machine is always ............ than the work done on the machine.
Select the correct alternative:
For an ideal machine, the efficiency is
What do you understand by a simple machine?
Derive the relationship between mechanical advantage, velocity ratio and efficiency of a machine.
The correct relationship between the mechanical advantage (M.A.), the velocity ratio (V.R.) and the efficiency (n) is ______.
What is the relationship between the mechanical advantage and the velocity ratio for:
(i) An ideal machine,
(ii) A practical machine.
Give an example of the following use of a machine to change the point of application of the force.
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 cut vegetables.
______ help us to make work easier.
