First rearrange the equation to find force normal to surface area:. Hydraulic systems A machine that uses liquid to transmit a force is called a hydraulic system. Calculating the force on a piston A hydraulic car jack is used to lift a vehicle. First calculate the pressure on the surface of piston A: On piston A, a force of N is exerted over an area of 0. Toothpaste is a fluid that is enclosed in a tube with a small opening at one end.
When any part of the tube is squeezed, toothpaste squirts out the open end. The pressure applied to the tube is transmitted equally throughout the toothpaste. When the pressure reaches the open end, it forces toothpaste out through the opening. One of the greatest technologies ever devised using the Pascal principle, is the hydraulic car lift. This took place around the time the hydraulic jack was discovered shortly after hydraulic press became commercially available.
The hydraulic car lift was an enhancement of the hydraulic jack, and it has taken the automotive industry by storm after manufacturers realised its plethora of applications.
The hydraulic car lift became one of the main tools used not just in car manufacturing but in car repair as well. Service centres as well as independent auto repair shops began acquiring their own machines. The mechanical advantage can be found by rearranging terms in the above equation to. Fairman - August Hydraulic systems use a incompressible fluid, such as oil or water, to transmit forces from one location to another within the fluid.
Given these simple formulas, try to answer the questions below. Exercises: A hydraulic press has an input cylinder 1 inch in diameter and an output cylinder 6 inches in diameter. If the input piston, with a 12 inch radius, has a force of 65 pounds pushing downward a distance of 20 inches, find the volume of fluid that has been displaced answer the upward force on the output piston answer the radius of the output piston answer the distance the output piston moves answer What pressure does a pound woman exert on the floor when she balances on one of her heels?
Her heels have an average radius of 0. What is the pressure the ground experiences beneath the tires that is due to the car? This syringe will be the "leading" syringe; you will use it to make the lift move. The other two syringes one small one and the large one will hold the weight that needs to be lifted. These will be the "helping" syringes. Use the extra-strong double-sided tape to adhere the center of one wall plate to the flat top of each of the plungers on the two helping syringes.
Carefully cut the tubing in two pieces, each about 2-feet long. For each helping syringe the syringes with plates attached connect a plastic tube to its tip. Push the plunger in each helping syringe all the way down so that it is fully depressed into the cylinder.
One at a time, put the free end of each tube into the water, and pull the plungers smoothly up as far as they will go without falling out of the syringes. The syringes will suck up water. Hold each syringe one at a time with its tip pointing up. Remove the air bubble near the tip of the syringe by pushing the plunger in slowly until all the air is pushed out of the tube. Place the end of the small syringe's tube back in the water, and suck in some more water.
Very little air should be left in either of the tubes or helping syringes. The small syringe should be full, and the larger one can be half-full.
Attach the vice to a sturdy surface. Procedure Insert the tip of the leading syringe into the free end of the tube connected to the small helping syringe. Push the plunger of this helping syringe in.
What happens to the leading syringe? Why would this happen? Do you need to push hard to get the water to transfer from one syringe to the other? If the tubing pops off, refill the tubing and helping syringe with water, and reattach the tubing to the leading syringe. If needed, seal the connection with plumber's putty. The leading syringe should now be full of liquid. Use the vise to carefully hold the helping syringe vertically with the plate horizontal and facing up. Be careful to not squish the cylinder of the syringe as this will obstruct the movement of the plunger.
Fill the jar with water, and place it in the precise center of the platform attached to the helping syringe in the vice. Do you think you can easily lift this weight by pushing on the leading syringe? Try it out. Push gently so the jar does not tumble off.
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