Question

Explain the phenomenon of hydraulic lift and hydraulic brakes

Answer 1

Hydraulic lift and brakes are based on the Pascal's law which states that when a force is applied to a enclosed liquid the force is exerted in every direction.

While in hydraulic lift and brakes only one side is opened for the liquid to travel so it rises that way.!!


Hope it will help!!

Answer 2

$\fbox{working \: of \: hydraulic \: lift \: - }$

When handle H of liver is pressed down by applying an effort, the valve V grand opens because increase in pressure in the cylinder P. The liquid runs out from the cylinder P to the cylinder Q. As a result, the piston B risers of and it raises the car placed on the platform. When the ka reach the desired height, the handle H of liver is no longer pressed. The valve V gets closed (since the pressure on either side of the valve becomes same) liquid may not run back from the cylinder Q to the cylinder P.

$\fbox{working \: of \: hydraulic \: brakes \: - }$

To apply brakes, the foot pedal is pressed due to which pressure is exerted on the liquid in the master cylinder P, so liquid runs out from the master cylinder P to the wheel cylinder Q. As a result, the pressure is equally transmitted and undiminished through the liquid to the Pistons B1 and B2 of the wheel cylinder because of which both Pistons get pushed outwards and brake shoes gets pressed against the rim of the wheel due to which the motion of the wheel retards.

To apply brakes, the foot pedal is pressed due to which pressure is exerted on the liquid in the master cylinder P, so liquid runs out from the master cylinder P to the wheel cylinder Q. As a result, the pressure is equally transmitted and undiminished through the liquid to the Pistons B1 and B2 of the wheel cylinder because of which both Pistons get pushed outwards and brake shoes gets pressed against the rim of the wheel due to which the motion of the wheel retards.As the pressure is transmitted through the liquid, equal pressure is exerted on all the wheels of the vehicle that are connected to the pipeline R. When the pressure on the pedals is released, the liquid runs back from the wheel cylinder Q to the master cylinder P and the spring pulls the brake shoes to their original position and compels the Pistons B1 and B2 to return back into the wheel cylinder Q. Hence, brakes are released.

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