Key Concepts 1
Name__________________________
Key Concepts
1. Conversion factors can be used to convert from one unit to another.
2. Velocity is a change in position divided by time.
3. Acceleration is a change in velocity divided by time.
4. The slope of a position-time graph equals velocity.
Vocabulary
Conversion Factor
A ratio of units that is equal to one. (1 kg / 1000 g).
Magnitude
Size.
Resultant
A vector that represents the sum of 2+ other vectors.
Delta
Change in a quantity. Final minus initial.
Velocity
Fastness and direction. Vector.
Speed
Fastness with no direction. Scalar.
Vector
A quantity with magnitude and directional information.
Scalar
A quantity with magnitude but no directional information.
Instantaneous Speed
The speed at a certain time.
Acceleration
Change in velocity / time.
Velocity
Change in position / time.
Translation
Motion in a straight line.
Rotation
Spinning motion.
Linear Relation
One variable depends on the other directly. y = 3 x
Quadratic Relation
One variable depends on the square of the other. y = 3 x2
Inverse Relation
One variable increases when the other decreases. y = 1 / x
Example 1. A car travels 30 meters north then 10 meters south. This takes 5 seconds.
Speed = dist / time = 40/5 = 8 m/s.
Velocity = disp / time = 20/5 = 4 m/s north.
Example 2. Mr. Blount runs one lap (400 m) around the track in 40 seconds.
Speed = dist / time = 400/40 = 10 m/s.
Velocity = disp / time = 0/40 = 0 m/s.
Write the key concepts.
1. ______________________________________________________________________________
2. ______________________________________________________________________________
3. ______________________________________________________________________________
4. ______________________________________________________________________________
Write the definitions.
5. Conversion Factor
6. Magnitude
7. Resultant
8. Delta
9. Velocity
10. Speed
11. Vector
12. Scalar
13. Instantaneous Speed
14. Acceleration
15. Velocity
16. Translation
17. Rotation
18. Linear Relation
19. Quadratic Relation
20. Inverse Relation
Example 1. A car travels 30 meters north then 10 meters south. This takes 5 seconds.
21. What is the speed? ______________________________________________________________
22. What is the velocity? _____________________________________________________________
Example 2. Mr. Blount runs one lap (400 m) around the track in 40 seconds.
23. What is the speed? ______________________________________________________________
24. What is the velocity? _____________________________________________________________