In a hydraulic system the large piston has cross-sectional area A2 = 200 cm2 and the small piston has cross-sectional area A1 = 5 cm2. If a force of 250 N is applied to the small piston, what is the force F, on the large piston?
-When the handle is pressed down, valve A is closed whereas valve B is opened. The hydraulic fluid is forced into the large cylinder and hence pushes the piston moving upward.
-When the handle is raised, valve B will be closed while vale A will be opened. Hydraulic fluid from the buffer tank will be suck into the small cylinder.
-This process is repeated until the load is sufficiently lifted up.
-The large piston can be lowered down by releasing the hydraulic fluid back to the buffer tank through the release vale.
When the brake pedal is pressed, the piston of the master cylinder applies a pressure on the brake fluid.
This pressure is transmitted uniformly to each cylinders at the wheel, cause the pistons at the wheels to push the brake shoes to press against the surface of the brake.
The friction between the brakes and brake shoes causes the vehicle to slow down and stop.