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16 Cards in this Set

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  • Back
Define 'density'
A value that tells you how many kg there are per 1m cubed
Why do we need to know density?
It helps identify whether one material will sink in another
Equation for density?
Density = mass/volume
Unit for density?
kg/m3
What effect does heat have on density?
If we heat a substance, the molecules spread out. This means the volume increases. Heating an object decreases the density.
Describe an experiment to find the density of an irregular object.
Lower into displacement jug and measure water displaced. this is the volume. Measure three times and take average for more accurate results
What is pressure?
Force per unit area.
What is the equation for pressure?
Pressure = Force/Area
Units for pressure?
N/m2 or N/m3 (Pa)
How do you convert cm2 into m2?
divide by 10,000
Smaller area = ..... pressure
Higher
The pressure at a point inside a liquid or gas is .....
The same in all directions
As we get deeper in water and air the pressure .....
Increases
Equation for pressure difference
Pd = pressure x height x gravity
Explain the theory behind hydraulics
If we apply pressure to a fluid, it transfers this pressure elsewhere.
Describe how hydraulics work
Put a small force on a small area, and a larger force on a larger area is created because the pressure remains constant.