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Physics P14 & P15 (Specific Heat Capacity (J/kg°C) (Specific Heat…
Physics P14 & P15
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Density (kg/m^3)
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Higher density, higher pressure (only in liquids) when the pressure is exerted.
Distortion
Methods:
- Bending requires two forces, one acting clockwise and one anti clockwise.
- Stretching requires two forces of tension, acting away from each other.
- Compression involves two equal forces acting towards each other.
Elastic Distortion
- Means that a material will return to it's original shape when the deforming force is removed.
Inelastic Distortion
- Means that a material will not return to it's original shape when the deforming force is removed.
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Pressure and Temperature
The pressure of a gas depends on the motion of the particles in gases. Gas particles strike the walls of containers at many different angles.
If the temperature is increased, gas particles have higher kinetic energy, so they move faster , therefore more successful collisions. More force is exerted on the walls of the container and the pressure of the gas increases.
Absolute Zero
- As a gas is cooled, the particles move slower and volume gets smaller. At -273°C, gas volume is at zero, this is 0 Kelvin.
- Celcius to Kelvin = +273
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Upthrust
A body floating in a fluid is subject to an upwards force called the upthrust. This is equal to the weight of the fluid that is displaced.
Pressure and Fluids:
- Pressure exerted in a liquid will increase with depth as there will be greater weight above the water.
- This causes a force that is normal to any surface.
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