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P6: Models and Explanations
- Density
- Density (kg/m3) = Mass (kg) / Volume (m3)
- Measuring Solids
and Liquids
- Measure the mass and volume
of substance. To measure the
mass, use a mass balance and
to measure the liquid, pour it
into a measuring cylinder.
- Measure the mass and volume
of substance. To measure the
mass, use a mass balance and
to measure the liquid, pour it
into a measuring cylinder.
- Density (kg/m3) = Mass (kg) / Volume (m3)
- Specific Heat
Capacity
- The energy needed to
change the temperature of
a material.
- E.G. In an electric kettle, energy is transferred electrically
from the mains to the thermal energy store. It's
transferred by heating to the thermal energy store of
the water, the water's temperature rises.
- Change in Internal Energy (J) =
Mass (kg) x Specific Heat Capacity
(J/kgC) x Change in Temperature
- The energy needed to
change the temperature of
a material.
- Specific Latent
Heat
- The energy needed to change state.
- Energy to Cause a Change of State (J) =
Mass (kg) x Specific Latent Heat (J/kg)
- The energy needed to change state.
- Forces and
Elasticity
- When you apply force to an object it can be
stretched, compressed or twisted but it can't go
back to its original shape (deformed)
- Force Exerted by a Spring (N) =
Extension (m) x Spring Constant (N/m)
- Energy Stored in a Stretched Spring (J) = 0.5 x
spring constant (N/m) x (extension)2 (m)2
- When you apply force to an object it can be
stretched, compressed or twisted but it can't go
back to its original shape (deformed)
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