Explain how a light push applied to the lever of a hydraulic brabershop chair can lift a person in the chair.?

Answer 1

This has to do with pressure and fluids... In a closed system such as a hydraulic lift, the ratio of the applied force to the surface area to which the force is applied inward will equal the ratio of the outward force and the surface area at the other end. The equation looks something like this:

(F(in)/A(in))=(F(out)/A(out))

So if you applied a force of 10 N to a surface area of 0.5 m^2 (yes, this is large, I know, but it's just an example) and the surface area of the fluid on the other end doing the lifting is 5 m^2, then the outward force will be 100 N. Thus a small amount of initial force produces a much larger result.

Answer 2

Assuming that the barbershop chair has no extra power applied by an external pump. Then the normal method is that the level being pushed by the barber is moving a greater distance than the chair moves. Which is why he has to repeatedly push the level to get a small amount of lift. For example he may push with 20 pounds of force over a distance of 5 inches. and the chair will move a 200 pound load up 0.5inches. Multiply the distance and force to get a constant amount of work.

Answer 3

are you guys kidding? have you not sat in an office chair with a lever that raised the whole chair when you pulled on it?

a large spring and an air chamber. when u arent sitting onthe chair, the chair is light enough for the spring to lift the whole chair. but this lifting only happens when you pull the lever because this lever is what locks the chair at a certain height. when the spring extends, an air chamber takes in air from the bottom. when you release the lever, the chamber is locked and so that air can no longer escape. so when you then sit on the chair, you are resting on a column of pressurised air.

now that you are sitting on the chair and you pull the lever, you are opening the chamber. now that the chair is much heavier than normal because you are on it, the chair will start descending because the air is allowed to escape. the spring also cannot sustain the height because it is only strong enough to hold an empty chair.

there you have it.

Answer 4

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