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# Systems

What is pressure? the continuous physical force exerted on or against an object by something in contact with it.
What is a hydraulic system? The term hydrostatic refers to the transfer of energy from flow and pressure, not from the kinetic energy of the flow
What is a pneumonic system? .It works with the study of pressurized gas that produces mechanical motion, and the application of such gases to produce motion. Systems based on pneumatics are found in factories that deal with compressed air and inert gases.
How do you calculate pressure? P=Force/Area
What units are pressure expressed in? Neutons
What is the dependant variable? a variable (often denoted by y ) whose value depends on that of another.
What is the independent variable? The independent variable is the one that is changed by the scientist.
What is the controlled variable? things that you must maintain for a successful experiment
What is the force of gravity expressed in Newtons? 9.8
What is force measured in? Newtons
What is the formula for calculating Force of gravity F= (mass of the object) x (the strength of Earth's gravitational field)
How many times greater is weight on Earth as it is on the Moon? 6 times
Does you mass change depending on what planet you are on? no your mass doe not but your weight do
Find the weight of a 50 kg student on Earth. F = (50 kg)(9.8 N/Kg) = 490 N
What is work? When a force moves an object over a distance
What is work measured in? Joules
What is the formula for calculating Work? Work = (force in Newtons) x (distance in meters)
Calculate the following.... If Jennifer pushes a box with a force od 150 N and the box moves 3.0 m. How much work does she do on the box? W= (150)(3.0) 450 J
If the box has a mass of 25 kg, how much work will it take her to lift it from the floor to 2.0 m in the air? 490 J
Created by: raffertyj