Question

Hydraulic machines work on the application of
A) Pascal’s Law
B) Newton’s Law
C) Law of gravity
D) None of these

Answer 1

Hint: Here we have asked the working principle of hydraulic machines. Hydraulic machines are hydraulic brake, hydraulic lift, etc. So here we will discuss hydraulic brakes and its working principle. We will also discuss the law given in the option to relate it with the mechanism of hydraulic machines.

Complete step by step answer:
Hydraulic word basically refers to the fluid. So machines which use fluid for their mechanism are hydraulic machines.
In hydraulic machines the pressure is applied on the fluid and due to this a huge amount of energy is generated. Even if we apply pressure on a small amount of fluid then also enough energy is generated to run a machine.
Now we know according to Pascal’s law the pressure applied on an enclosed fluid in any point will be equal in all directions or at all points i.e. their magnitude will be the same.
Now in the hydraulic machines also we are applying pressure on the fluid and according to Pascal’s law pressure is distributed uniformly in all directions which results in generating the energy.
Hence, we conclude that Hydraulic machines work on Pascal’s law.

Option A is correct.

Note:
Newton’s laws are basically for the motion of an object. It is associated with the amount of force applied or the momentum but it cannot be the working principle here. And the law of gravity is actually due to the mass of the object which experiences the gravitational pull due to other objects having mass.