Acceleration and Velocity Flashcards
What is the difference between a scalar and a vector
A vector is a quantity with both magnitude and direction. A scalar is a number without any directon.
List 4 Scalars
Volume, mass, time, and temperature
Acceleration due to gravity
the acceleration of a freely falling object under the influence of earth’s gravity (9.8 m/s^2)
average acceleration
An object’s change in velocity during some measurable time interval divided by the time interval
List 4 vectors
Velocity, momentum, force, speed, and displacement
free fall
the motion of an object due only to the effect of gravity
What is the equation to find velocity?
d/t
What are the equations used to solve for acceleration?
a = vf - vi / t
instantaneous acceleration
change in an object’s velocity at an instant of time
velocity time graph
velocity is plotted on the vertical axis and time is plotted on the horizontal axis
What are the units used for velocity, distance, time and acceleration
Velocity: m/s
acceleration: m/s squared
time: seconds
distance: meters
Displacement
a change in position
Define position-time graph
In which the time data is plotted on the x-axis and the position data is plotted on the y-axis
particle model
you replace the object or objects with single points
Define average velocity
Average velocity is the ratio of an object’s change in position to the time interval during which the change occurred
an object’s velocity is how fast it is moving and _____
in what direction it is moving
the average speed is ___
the absolute value of the average velocity
The rate at which an object’s velocity changes is its _____
acceleration
The acceleration due to gravity on earth is _____
9.8m/s squared
a series of points that depicts an object in motion is a ____
motion diagram
Which of the following results in the largest acceleration?
A large change in velocity over a short time interval
position time graph
a graph with time data on the x axis and position on the y axis
What is the purpose of drawing a motion diagram?
A motion diagram represents the motion of an object by displaying its location at various equally spaced times on the same diagram and provide a visual aid to the problem for a better understanding
Under what circumstances is it legitimate to
treat an object as a particle when solving
motion problems?
The object’s size must be less than the distance it moves. Or if the object’s internal motions are irrelevant.
How are velocity and acceleration related?
Acceleration is the rate of change of velocity.
If an object’s velocity-time graph is a
straight line parallel to the horizontal axis,
what can you conclude about the object’s
acceleration?
When the velocity-time graph is a line parallel to the horizontal axis the object’s acceleration is zero.
absolute value
the magnitude of a real number
What is the difference between average velocity and instantaneous velocity?
Average velocity is the ratio of an object’s change in position to the time interval during which the change occured. Instantaneous velocity is the speed and direction of an object at a particular instant.
Explain the meaning if the velocity is above or below the x-axis
If the velocity is above the x-axis, it is negative but moving toward the origin. If it is below the velocity is still negative but moving away from the origin
What do the lengths of velocity vectors mean?
The longer the vector, the faster the object. The closer the vectors are the slower, the further apart the faster.
