Mass Weight Density Lecture Olevels/IGCSE Physics 5054/0625

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1.3 Mass and weight
1 State that mass is a measure of the quantity of matter in an object at rest relative to the observer
2 State that the mass of an object resists change from its state of rest or motion (inertia)
3 Know that weights, and therefore masses, may be compared using a beam balance or equal-arm balance
4 Describe how to determine mass using an electronic balance
5 Describe how to measure weight using a force meter
6 Define gravitational field strength as force per unit mass; recall and use the equation
gravitational field strength = weight mass
g = Wm
and know that this is equivalent to the acceleration of free fall
7 State that a gravitational field is a region in which a mass experiences a force due to gravitational attraction
1.4 Density
1 Define density as mass per unit volume; recall and use the equation
density = mass volume
ρ = mV
2 Describe how to determine the density of a liquid, of a regularly shaped solid and of an irregularly shaped
solid which sinks in a liquid (volume by displacement), including appropriate calculations