PASCO scientific 012-12537A INSTRUCTIONS AND EXPERIMENTS for the PNEUMATIC / HYDRAULIC JACK SET Designed and manufactured by… SE-8764A
Pneumatic / Hydraulic Jack Set SE-8764A Notes to the Teacher Description The Transparent Devices Hydraulic/Pneumatic Jack Set includes a rugged stand that holds a large cylinder-and-piston syringe, four smaller syringes, and flexible tubing assemblies with valves and quick-connect fittings, together with this manual. Purpose This set makes possible a number of teacher demonstrations and student experiments involving fluids and air.
Pneumatic / Hydraulic Jack Set SE-8764A This apparatus includes the following items: (c) (b) (d) (a) (i-l) (e) (h) (f) (g) (a) (b) (c) (d) (e) (f) (g) (h) (i-l) Jack Stand Plunger (piston) 60 cc Main Syringe Body (cylinder) Syringe collar Main hose assembly with one small T-fitting for attaching the assembly to the main syringe, 2 one-way valves, another T-fitting for attaching a smaller syringe, and a quick-connect fitting Assembly with ¼ turn valve and hose ¼ turn valve Extra hose assembly wit
Pneumatic / Hydraulic Jack Set SE-8764A Setting up the apparatus and observing the action of a pump Thread the syringe collar (d) rounded-side-up onto the 60 cc main syringe body (c). rounded side Now push the 60 cc main syringe body (c) into the jack stand (a) such that the scale of the syringe is 900 to the right of the window of the jack stand. Do NOT seat the syringe collar on the stand yet.
Pneumatic / Hydraulic Jack Set SE-8764A Turn clockwise while holding the T-fitting with your finger. Do not over-tighten. Do NOT lower and tighten the syringe collar until the hose T-fitting is attached Insert the piston (b) into the 60 cc main body syringe (c). Push it in all the way. Install the 6 cc syringe onto the sidearm of the T-fitting (between the two one-way valves) of the main hose assembly (e). Do not over tighten.
Pneumatic / Hydraulic Jack Set SE-8764A Close the valve (g) by turning the handle one-quarter turn, so that the handle is at right angles to the tubing. Pump the small syringe 3 or 4 times. Tell what happens, and tell why it happens.
Pneumatic / Hydraulic Jack Set SE-8764A The Hydraulic Jack as a Simple Machine, or “Force Transformer” Machines such as levers, pulley arrangements, and hydraulic systems can multiply an input force, to produce a greater output force. In this experiment we investigate this phenomenon in a hydraulic jack. Set up and "bleed" the apparatus as described previously. The large piston should be pushed all the way down. The 6 cc syringe should be installed as indicated in the diagram.
Pneumatic / Hydraulic Jack Set SE-8764A Open the valve to lower the load. Then close the valve again. Note the position of the large piston that supports the books. Pump the small piston for 5 strokes. Count the strokes, and use a ruler to measure the distance the piston moved. Also note the volume of fluid that entered the syringe.
Pneumatic / Hydraulic Jack Set SE-8764A Relating Force, Area, and Pressure This experiment is a study of how the variables force, area, and pressure are related. In this experiment we will produce the same amount of pressure four different times by applying force to four different syringe pistons. The amount of pressure created will be just the amount needed to lift a stack of books on the hydraulic jack, and is thus the same each time.
Pneumatic / Hydraulic Jack Set SE-8764A If a pressure sensor was available during this experiment, compare the pressure to the slope, and comment. (If the pressure sensor is calibrated in units of pascals, (Pa), note that one pascal is the same as one newton per square meter.
Pneumatic / Hydraulic Jack Set SE-8764A Boyle’s Law: Unlike liquids, which have a relatively constant volume, a sample of gas may vary greatly in volume. The volume and pressure are related by a mathematical formula called Boyle’s Law. This lab provides data that may be analyzed to discover this formula. Air or another gas may be used as the gas. Set up the system as described previously, except that the system should be as free of water as possible.
Pneumatic / Hydraulic Jack Set #of books volume total wt of books SE-8764A pressure due to books total pressure for later use 1 2 3 4 5 6 Boyle’s Law states that the Pressure of a gas sample times its Volume is constant, assuming constant temperature. Test this by calculating P x V for the gas sample for each of the 6 pressures. © 2001 James M.
