# Motion in One Dimension

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1. 1D motion
motion forward or backward, up or down, left or right
2. frame of reference
a coordinate system for specifying the precise location of objects in space
3. displacement
the change in position of an object
4. positive/negative direction
• positive: up/right
• negative: down/left
5. average velocity
total displacement divided by the time interval during which the displacement occurred
6. instantaneous velocity
the velocity of an object at some instant (or specific point in its path)
7. velocity vs. speed
velocity gives a direction, is a vector whereas speed is a scalar
8. position vs. time graph slope
• slope is the velocity
• steeper slope means greater speed
• straight line is constant velocity
• horizontal line is at rest
• positive value means positive direction, negative value means negative direction
9. acceleration
the rate of change of velocity
10. acceleration with constant velocity
0
11. velocity vs. time graph
• shows acceleration
• object is at rest when the velocity is 0
• upward slope: speed increasing
• horizontal slope: constant velocity, no acceleration
• downward slope: speed decreasing
12. positive velocity and acceleration
speeding up
13. negative velocity and acceleration
speeding up
14. positive velocity and negative acceleration
slowing down
15. negative velocity and positive acceleration
slowing down
16. 0 velocity and 0 acceleration
at rest
17. constant acceleration
velocity increases by the same amount during each interval; displacement for each time interval increases by the same amount
18. free fall
motion of an object falling with a constant acceleration
19. motion
natural event that involves a change in the position or location of something
20. 3 physical descriptions that describe motion
• displacement: change in position
• velocity: rate at which the displacement changes
• acceleration: rate at which the velocity changes
21. vector
• physical quantity with magnitude and direction
• e.g. velocity, displacement, acceleration, force
22. sector
• has magnitude only
• e.g. speed, mass, temperature, time
23. acceleration vs. time graph
• horizontal line is constant acceleration
• sign of acceleration is the same as the sign of velocity
24. free fall constant
-9.81m/s2
 Author: Gymnastxoxo17 ID: 275293 Card Set: Motion in One Dimension Updated: 2014-05-25 15:18:12 Tags: Chapter Two Folders: H Physics Description: d Show Answers: