Explain about hydraulic lift and hydraulic brakes.
Answers
hydraulic lift:
refer the above picture and then see this description.
when handle H of lever is pressed down by applying an effort the valve V open because of 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 Rises up and addresses the car placed on the platform when the car reaches the desired height the handle H of lever is no longer pressed the valve V get closed since the pressure on either side of the valve becomes same so that the liquid may not run back from the cylinder Q to the cylinder P.
hydraulic brakes:
refer the second picture for hydraulic brakes for the description down.
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 transmitted equally and undiminished through the liquid to the Pistons B1 and B2 of the wheel cylinder Q therefore the Pistons B1 and B2 get pushed outwards and brake shoes get pressed against the rim of the wheel due to which the motion of vehicle retards since the area of cross section of piston A in the master cylinder P is less than that in the wheel cylinder he was small force applied on the foot pedal produces a large force on the Piston B1 and B2 of the Wheel cylinder Q this is a force responsible for determining the motion of Transmission of pressure through liquid ,equal pressure is exerted on on Wheels of the vechile connected to the pipeline R
on releasing the pressure on the pedal 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 forces the Piston B1 and B2 to return back into the wheel cylinder Q thus the brakes get released.
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HLO MATE HERE IS UR ANSWER.
❤. HYDRAULIC LIFT ❤
⭐. In a hydraulic lift two pistons are separated bt the space filled with a liquid .
⭐. A piston of small cross section A1 is used to exert a force F1 directly on the liquid .
⭐. Accordig to pascals law , the pressure is transmitted through the liquid to a larger piston of area A2.
⭐. The upward force exerted on larger pistion is .
F2 = PA2 = F1A2/A1
F2/F1= A2/A1.
since A2 > A1 , therefore F2 >F1.
Thus a small force F1applied on the smaller piston can be used to exerted a larger force F2 on the bigger piston.This is the principle of a hydraulic machine.
❤. HYDRAULIC BRAKES ❤
⭐. When a small force is applied on the pedal with our foot the master piston moves inside the master cylinder.
⭐. Then the pressure caused is transmitted through the brake oil to act on a piston of large larger area.
⭐. A large force acts on the piston and is pushed down expanding the brakes shoes against brake lining.