Marvelous Motion
This is calculated when you take the total distance traveled and divide by the total time.
Average speed
Kim travels 300 miles in 4 hours. What is her average speed?
75 mi/hr
What does it mean if an object has a negative acceleration?
It is slowing down
What does the slope on a velocity vs. time graph tell you?
Acceleration
A rocket moving at a speed of 710 m/s can travel very far in 5 seconds. Determine how far.
3550 m
This describes an object’s speed and direction.
Velocity
A train travels 2,000 mi at a constant speed of 50 mi/hr. How long did the trip take?
40 hours
A skier is going downhill at a speed of 9 m/s. The hill gets steeper and his speed increases to 18 m/s in 3 s. What is his acceleration?
3 m/s^2
What would the following look like on a graph: distance vs. time graph of an object that is not moving.
horizontal line
If a car slows down from a speed of 80 m/s to 10 m/s in 7 s, what is its acceleration?
-10m/s^2
The slope on a distance vs. time graph tells you
Speed
Rate of change in velocity is known as
Acceleration
A bus traveling 12 m/s comes to a stop after 6 seconds. What was its acceleration?
-2 m/s^2
Sketch a distance vs. time graph of an object that is moving at a constant speed.
Varies
The speed that shows up on the speedometer on a car is known as what?
Instantaneous Speed
A runner jogs 60 m on a track towards the finish line, then turns and runs back 20 m. What is her distance?
80 m
Find the velocity of a truck that travels 250 miles North to NYC in 5 hours.
50 mi/hr North
What is the acceleration of an object with a constant velocity?
0
On a distance vs. time graph, what type of line indicates that an object is moving at a constant speed?
A straight diagonal line (a line with a constant positive slope)
What does a flat line on a velocity vs. time graph mean?
The object is moving at a constant speed.
A runner jogs 60 m on a track towards the finish line, then turns and runs back 20 m. What is her displacement?
40 m towards the finish line
How is it possible to have a constant speed but a changing velocity?
Change in direction
A race car starting from rest accelerates at a rate of 6 m/s². What is the velocity of the race car after 15 seconds?
90 m/s
What does a horizontal line at 0 m/s on a velocity vs. time graph mean?
The object is at rest (not moving).
Tamra rides her bike 10 blocks north and then turns around and rides 5 blocks south. What is her distance and displacement?
Distance = 15 blocks
Displacement = 5 blocks north