Unit 1 Test Flashcards
Vectors
Quantities defined by a magnitude and direction.
Examples of Vectors
Displacement, velocity, acceleration, and force.
Scalars
Quantities defined by a magnitude. (no direction)
Examples of Scalars
Distance, speed, time, and energy.
Distance
The total length traveled by an object from one point to another.
Displacement
It tells us where an object is relative to a chosen point. It includes the straight-line distance between the two points AND the direction the line points in.
Speed
A scalar quantity which describes how fast an object is moving. (v=d/t)
Velocity
A vector value which describes how fast an object is moving, and in what direction it is moving. (v=d/t)
Instantaneous Velocity
The velocity at an instant in time.
Average Velocity
The average velocity over a period of time. (v=Δx/Δt)
What are the parts of a Velocity vs. Time graph?
Y-axis: Velocity (m/s)
X-axis: Time (s)
Y-intL Initial Velocity
Slope: acceleration (m/s^2)
If acceleration is constant, what kind of line is Velocity?
Straight line
If acceleration changes, what kind of line is Velocity?
Curved line
What does the Area under a Velocity graph give us?
The displacement
What is acceleration?
The rate of change in velocity. (a=Δv/Δt)
What is the slope of a Displacement vs. Time graph?
Velocity
If velocity is constant, what kind of line is Displacement?
Straight line
If velocity is not constant, what kind of line is Displacement?
Curved line.
What does the area under a Displacement vs. Time Graph give us?
Nothing (think m x s = ms)
What do horizontal lines on an Acceleration vs. Time graph tell us?
They tell us there is a constant velocity.
What does the area under an Acceleration vs. Time graph give us?
Total change is velocity.
Acceleration
A vector quantity that tells us the rate of change of velocity.
What is gravity?
g=9.81m/s^2
What is Free Fall?
Falling object where only the gravitational force is acting on the object.
