Motion

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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.

Why do two objects released at the same time and height hit the ground at the same time? Constant Acceleration

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

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

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.

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

What is the relationship between velocity and acceleration? Acceleration is a change in velocity

Acceleration - when there is a change in velocity

Vector - a size and direction

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

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

velocity is m/s

Acceleration is m/s²

What is the relationship between displacement and motion? You have to have motion to have displacement.

Vocab

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

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

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.

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

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

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

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