Mass, Weight and Density
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Define mass
the amount of substance or matter in a body
what are the differences in defining mass and weight?
mass is amount of substance or matter in body whereas weight is the gravitational force acting on a body.
what are the differences in mass and weight in terms of scalar and vector?
mass is scalar, weight is vector
what are the differences in SI units in mass and weight?
mass is kg, weight is N or kg m s^-2
what are the differences in the variable mass and weight is dependent on?
mass dependent on amount and composition of matter in a body whereas weight is dependent on mass and gravitational field strength acting on body
what are the differences in how mass and weight is vary with gfs?
constant for mass and increases as gfs increases for weight
what are the differences in the measuring instruments used for variable mass and weight?
beam balance or calibrated electronic balance for mass; spring balance or newton meter for weight
what is a gravitational field?
a region in which a mass experiences a force due to gravitational attraction
what is gravitational field strength?
the gravitational force acting per unit mass on an object
what is the gravitational field strength on earth?
10N kg^-1
what happens to the weight of an object as it moves further away from earth?
decreases
how do we calculate weight?
W (weight in N) = m (in kg) x g (gfs in N/kg or acceleration due to gravity in m/s^2)
what is inertia?
the reluctance of object to change its state of rest or motion, due to its mass
what is the effect inertia has on an object at rest
it tends to stay at rest
what is the effect inertia has on a moving object?
it tends to maintain its state of motion
what is density?
mass per unit volume of a substance
how do we calculate density?
density(kg/m^3) = mass(kg)/vol. (m^3)