Vocab
What is acceleration?
the change in an object's velocity over time
what is a vector quantity?
a physical measurement that contains both magnitude and directional information
What is the speed equation?
distance/time = speed
Explain how the reference point changes how we preserve motion?
If you are moving with the object, the motion is going to be different than if you are observing the motion from a distance (roller coaster, on the ground vs on the ride)
What is velocity?
the measure of an object's speed and direction, combining both magnitude and direction to describe its rate of change of position
What is a scalar quantity?
A physical measurement that contains only magnitude and does not contain directional information
What is the velocity equation?
Velocity = distance/time
How would backtracking change the displacement of an object (ie you drop your keys and have to go back for them).
If you walk forward, then turnaround and walk back, your displacement is going to be less than if you stayed put or kept going
What is average speed?
The ratio of the total distance traveled to the total time of the trip
A point against which motion is measured
What is the acceleration equation
acceleration= (final velocity-initial velocity)/time
How are speed and velocity different?
Speed tells you how fast something moves while velocity tells you speed and direction
What is instantaneous speed?
the rate at which an object is moving at any given moment in time
What is displacement?
the distance an object travels plus the direction from the starting point
what does the slope of speed graph show?
The change in speed
How does the equation for relative velocity change if the objects are traveling away from each other?
The two speeds are added together
What is the difference between displacement and distance?
distance is the length of a path between two points and displacement is the distance plus direction (measured "as the crow flies")
What are the vector quantities and scalar quantities that we learned in this unit?
Speed and distance = scalar
Velocity and displacement = vector
What does the graph on acceleration not show?
direction
How does the equation for relative velocity change if the objects are traveling towards from each other?
the two speeds are subtracted