The length of the path between two points.
Distance
What two things do you need to state to describe motion?
•the direction the object is moving
•how fast the object is moving
What is the formula for distance?
What is acceleration?
the rate at which velocity changes.
Can acceleration be negative?
Yes
The ratio of the distance an object moves to the amount of time the object moves.
Speed
What is the difference between Distance and Displacement?
Distance is the length of the path between two points.
Displacement is the length of a straight line between two points.
What is the SI Unit for Speed?
meters/second (m/s)
A horse on a carousel is traveling at a constant speed, is it accelerating?
Yes, because it is constantly changing direction
On a distance versus time graph, what does a horizontal line represent?
There is no movement
The rate at which velocity changes.
Acceleration
What is the SI Unit for measuring distance?
meter (m)
What are the two ways to express speed?
average speed and instantaneous speed
What is the acceleration of any object due to Earth's gravity?
9.8m/s2
A person walks 3 blocks south, 2 blocks east, 5 blocks north, and finally 2 blocks west.
What is the distance traveled?
What is the person’s displacement?
The displacement was 2 blocks north.
Movement in relation to a frame of reference.
Relative motion
What is a vector?
a quantity that has magnitude and direction.
What type of speed does a speedometer show?
instantaneous speed
What is the formula for calculating acceleration?
(vf-vi)/t
What is a frame of reference?
a system of objects that are not moving with respect to one another.
The movement of an object toward Earth because of gravity.
Free fall
Two vectors that have different directions may be combined how?
They may be combined by graphing.
If an objects direction changes, does the velocity change? Why or why not?
A ball rolls down a ramp, starting from rest. After 2 seconds, its velocity is 6 meters per second. What is the acceleration of the ball?
3m/s2
Bus A travels 300 m in 12 seconds.
Bus B travels 200 m in 12 seconds.
Both vehicles travel at a constant speed.
How do the distance-time graphs for these two buses differ?
Bus A will have a steeper slope because it went a farther distance in the same time.