Velocity = Distance / Time
with a direction (must be with a direction)
100
What is the formula for acceleration?
Acceleration =
Final Speed - Initial Speed / change in time
100
The definition of motion.
When an object's distance from another object changes.
100
What can we find with a distance vs time graph?
speed of an object
200
How is speed different from velocity?
velocity needs a direction
200
What is the velocity of an object that is moving 6 meters in 2 seconds east?
3 m/s east
200
What are three ways we can tell if something is accelerating?
increasing its speed;
decreasing its speed;
changing direction
200
What you use to determine if something has moved.
Reference Point
200
What goes on the x axis when graphing speed?
time
300
What is the average speed of a cow that walks east 60 meters in 120 seconds?
(Remember, the units must be m/s or km/hr)
0.5 m/s
300
Distance = 20 meters
Time = 4 seconds
Direction = south
What is the velocity of this object?
5 m/s south
300
Final Velocity = 50 m/s south
Initial Velocity = 60 m/s south
Time to change velocity = 5 seconds
What is the acceleration of this object?
-2 m/s/s, south
300
What must a good reference point do?
Not move
300
What does a horizontal line in a speed graph indicate?
The object is at rest (no movement)
400
A porcupine moved toward a pond at a speed of 5 m/s. It took him 8 seconds. What was the distance he traveled?
40 meters
400
An object travels 25 meters in 2 seconds east. What is it's velocity?
12.5 m/s east (must include direction!)
400
How would you describe negative acceleration? You must use the word "speed".
decrease in speed over time
400
If you were walking with a bird on your shoulder, would the bird think you're moving? Explain
No, because since he's "attached to you", from his point of view you're standing still and everything else is moving.
400
What does a speed vs time graph with a straight line indicate about a moving object?
It's moving at a constant acceleration
500
What is the speed of an object moving east for 6 seconds at 105.3 m/s?
105.3 m/s
500
A pink alien moved south in its spacecraft for 2 km at a rate of 20 m/s. How much time did it take him to do this in seconds?
100 s
500
How would you describe the acceleration of this object?
- 14 m/s/s, east
decreasing its speed, decrease in 14 m/s every second
500
Why you feel like you're going BACKWARDS when a semitruck moves past you at a stoplight.
You think the semi is standing still, and since you're seeing further and further back on it, you assume you're the one moving and that you're moving backwards.
500
What does a horizontal line on a speed vs time graph indicate?
The object is traveling at a same (constant) speed