AP Physics 1: 1.4 Properties of Objects and Systems
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AP Physics 1: 1.4 Properties of Objects and Systems. What is the difference between inertial and gravitational mass?
AP Physics 1 | Properties of Objects and Systems |
Language | English Language |
Science Practice 3 | Engaging in scientific questioning |
Transcript
be the same thing right Well in order to prevent
him from failing the next physics quiz how should you
respond and hear the potential answers that All right we'll
get started Let's talk inertia way all know what gravity
is and no we're not talking about sandra bullock movie
although it was pretty cool and it did bank has
reconsider our dream of being an astronaut You may have
heard someone say a body at rest tends to stay
at rest and a body in motion tends to stay
in motion The person who first spoke these words was
yes sir isaac newton yet the same old guy who
took an apple to the head and figured out gravity
and he didn't say it exactly like that because they
spoken is funny way back then but that's the gist
of newton's first law of motion what this means is
that if you have a bowling ball sitting on a
table that ball isn't going to just start moving on
its own force needs to be applied to it to
make it move and once it's moving force needs to
be applied to make it stop moving or to make
it change direction that force can be friction or something
that can apply a direct force to stop the motion
So if we know what inertia is We can understand
inertial mass inertial mass is a measure of an object
tendency to resist change is in motion the mohr inertial
mass an object has the more it resists change like
your aunt who still thinks it's nineteen eighty six now
gravitational mass is calculated using an object gravitational weight but
don't confuse mass and weight They're not the same thing
mass doesn't change Sandra bullock has mass no matter where
she is but wait requires gravity that's why sandra can
be weightless in space she's not being pulled down by
the earth's gravitational force or by george clooney to calculate
an object gravitational mass We need to know the objects
weight and the force of gravity So when we put
all this knowledge together we see that the correct answer
is option A inertia refers to an objects resistance to
change while the gravitational mass is the mass calculated from
an object gravitational weight option b is wrong because the
values aren't different and objects inertial mass is the same
as its gravitational mass differences just in how they're measured
see gets it wrong because mass never refers to volumes
plus uses the definition of inertial master To find gravitational
and option d is wrong because the formula used to
calculate the types of masses is the same So if
inertial mass and gravitational masters equal to each other why
do we need to know the diff Well it's Because
they let us describe mass in different ways And that
lets us think about mass in different ways Being able
to think about things in different ways is always helpful
in physics or well any other branch of science and
know our inertial mass doesn't quadruple on those saturday mornings
Just