Motion

How can we predict the
movement of an object
in one dimension?

Initial Answer
You can assume that the
object will move at a
constant speed and direction.Final Answer
We can predict the movement of an object in one dimension by looking at the velocity and acceleration.

You can tell something is moving by
the change in the background behind
it.

Displacement is how far something is
from it's starting point.

If you go East 80m then West 20m your
total distance would be 100m but your
displacement would be 60m because you
are 60m from your starting point

🛆x=xf-xi : 🛆x = change in position, xf =
final position, xi = initial position

When you’re on a road trip, the displacement
to your destination will not be the amount of
driving you do, unless there is a road that goes
straight from your house to your destination.

Vocab

Initial Reference - The starting point of an object that has experienced motion

Displacement - The length of a straight line from an object’s initial position to its final position

Acceleration is m/s²

velocity is m/s

Motion sensor lab - When you accelerate positively your graph goes up. If you aren’t accelerating at all then the graph flat lines. If you accelerate negatively, then the graph goes down

If you slow down, speed up, or change direction at all then you are accelerating

Vocab

Vector - a size and direction

Acceleration - when there is a change in velocity

MythBusters video - They show how a bullet being shot and a bullet being dropped from the same height will hit the ground at the same time because they accelerate toward the ground at the same rate

The pennies took about the same time to hit the ground when dropped and when hit off the table, probably because we weren’t accurate with the timer.

The acceleration of -9.8 m/s² if an object is thrown up it will accelerate at -9.8 m/s² until it is falling. An object thrown will go

An object being pulled by gravity will fall 9.8 meters faster for every second it is falling