Big Q:How can we predict the movement of an object in one dimension? Initial answer:If we know the starting point and where it is on the paper/computer Final answer:We can predict movement of an object in one dimension if the background is changing, its like when you're in a car and the car next to you is moving but you're not and you feel like you are moving.

Claim:An object has to move some sort of
distance to have a displacement unless
your displacement is zero even though
you can move but still have a displacement
of zero. You can’t have a displacement of
1 without moving

Evidence:If a car drives from a stop sign
to another stop sign its displacement is
the distance between the two signs. But
if the car goes around
the whole block and ends up back
at the first stop sign the displacement
is zero because it ended at the start of the drive.

Displacement-length of shortest straight line from starting point to ending point

Motion-Process of moving (changing position)

Personal experience:From when I woke
up to got to ast in school my displacement
was a straight line from my bed to the seat
that I was sitting in, even though I walked
all around the school none of that matters
when we are talking about displacement

Sources:10 and motion slideshow

Claim:The are related because you can’t
have a change in one if you don’t have a
change in the other. If you speed up in a
car you can call that increasing your velocity
or be accelerating the car

Evidence:If I am running in a marathon
going completely straight the whole way
my velocity won’t be changing that much,
but if i was doing a triathlon going down
a mountain my velocity would be changing
constantly because id either be slowing down
speeding up or turning to not run of the
side of the cliff but when I do any of these
three my acceleration changes.

Velocity-Speed in a given direction

Acceleration-Change in Velocity
(Change in speed or direction)

You can make a graph including velocity
and the time you were at this velocity.
Velocity on the y and time on the x, you
can find the slope from point to point and
then dividing you will get your acceleration

Personal experience:Pulling out of the
school parking lot my velocity would be
changing almost every second because
of the stop sign everyone stopping and
going and I have to turn so that changes
my velocity therefore changing my
acceleration

Sources: 12 and motion slide

Claim:Objects falling from the same
height will land on the ground at the
same time because gravity doesn’t
change its acceleration depending on
the object it’s always going to have
the same “force” on each object. The
only way the objects won’t hit the
ground at the same time is if the air
resistance differs

Evidence:Dropping a baseball and a
basketball they will land very close
to the exact same time as each other
so small that we couldn’t tell without
a camera. They land like this because
they have roughly the same shape so
that means their air resistance is pretty
much the same.

Gravity has a constant acceleration and
that acceleration is 9.8m/s2 This means
that every second an object is falling the
speed of that object goes up by 9.8m/s

An object’s weight has nothing to do with
the rate it falls and neither does density.
Even if you throw a ball perfectly level
with the ground and drop a ball at the
same time as you through the other one
both of the balls would hit the ground at
nearly the exact same time.

Personal experience:Hitting balloons
in the air trying to keep them up as
long as possible and you have two
balloons one is blown up a little bit
more than the other you notice the
one with more air is easier to keep
up because it’s bigger and has more
air resistance and it have more air on
the inside which makes it weigh nearly
the as the air outside of it if the rubber
wasn’t there

Sources:Q3 notes