Mass, Weight and Density Flashcards
what is mass?
it is a measure of the amount of substance/matter in an object
what is the si unit of mass?
kilogram (kg)
is mass a scalar or vector quantity?
scalar quantity
does gravitation field strength have an effect on mass?
mass is constant everywhere, it is not affected by gravitational field strength
what can be used to measure mass?
it can be measured by a beam balance or electronic balance
what is a gravitational field?
it is a region in which a mass experiences the gravitational force of attraction
define gravitational field strength
the gravitation force per unit mass
what is the unit for gravitational field strength?
g : Nkg-1 or m/s2
what is the approximate gravitational field strength on earth?
10N/kg
what affects weight?
the weight of an object depends on the gravitational field strength acting on it
can weight change?
the gravitational field strength varies in different places so weight can change
what can be used to measure weight?
a spring balance
what is the formula used to find weight?
W=mg
what is the unit for weight?
newtons (N)
what is difference between mass and weight in terms of measurement?
mass is a measurement of the quantity of matter in a body
weight is a measurement of gravitational force acting on a body
what is the difference between mass and weight in terms of ways to be measured?
mass is measured by a beam balance or electronic balance
weight is measured by a spring balance
what is difference between mass and weight in terms of quantity?
mass is a scalar quantity
weight is a vector quantity
what is the difference between mass and weight in terms of what it is affected by?
mass is constant everywhere
weight varies with gravitational field strength
what is the difference between mass and weight in terms of si unit?
the si unit of mass is kilogram (kg)
the si unit of weight is netwon (N)
define density
density is a measure of mass per unit volume
what is the unit of density?
kg/m3 or g/m3
how does density affect the compact of the matter?
the higher the density, the greater the compact of the matter
what is the formula for density?
density=mass/volume
my dog vomits
how to find the density of an alloy?
density=total mass/total volume
how does density affect whether an object will float in a certain liquid?
if the object is denser than the liquid, it sinks
if the object is less dense than the liquid, it floats
what is inertia?
it is the reluctance/resistance of an object to change its original state of motion
what is inertia affected by?
mass
how does mass affect inertia?
high mass -> high inertia -> difficult to start moving and stop moving the object
low mass -> low inertia -> easy to start moving and stop moving the object
