Velocity and Acceleration
Displacement
The change in position of an object
Acceleration
The rate at which velocity changes over time;an object accelerates its speed,direction, or both change.
Velocity
The speed of an object in a particular direction
What must be true to have a constant acceleration?
Unbalanced force must remain the same
Can you have constant speed with a change in velocity?
Yes you can! Because you can keep the same speed and change direction
terminal velocity
forces of gravity and friction are balanced so the velocity stops increasing
Speed
scalar, amount of distance covered in a given amount of time
initial or starting velocity
the first speed and direction of the trip you are measuring
final velocity
the last speed and direction of the trip you are measuring
What is the difference between speed and velocity?
Speed has no direction only magnitude Velocity has both magnitude and direction
What must be true to have a constant velocity?
Speed must be the same and you cannot change direction
acceleration due to gravity
9.8 m/s/s
Give an example of an object with an acceleration that is NOT constant.
A car where you press on the gas pedal and let it up as your reach your desired speed.
Frame of Referance
A system for specifying the precise location of objects in space in time
What is the difference between velocity and acceleration?
Acceleration is increasing or decreasing speed or changing direction, whereas velocity is how much distance you cover in a given amount of time.
Give an example of an object with constant acceleration.
An elephant falling from a cliff
Motion
An object's change in positon relative to a referance point
What is the difference between constant velocity, instantaneous velocity and average velocity?
Constant is not changing, instantaneous is in a given moment and average takes into account changes along the "trip"
constant acceleration
velocity changes continuously at the same rate
constant velocity
velocity stays the same throughout the "trip" => same speed and same direction