Physics Ch. 1-3

3. the slope of the line that is tangent to the velocity versus time curve at time t.
4. speed and direction -- as its velocity at a single instant of time.
6. the moving of something from its place or position (the change of place or position)
7. an image showung an object's position at several equally spaced instants of time.
9. a number expressing the central or typical value in a set of data, most commonly the mean, which is calculated by dividing the sum of the values in the set by their number
10. a vector with a magnitude of 1; no units; and parallel to a coordinate axis
11. the path along which an object moves.
13. the quantity of the fastness or slowness of an object.
15. the sum of two vectors.
16. occurring or done in an infinitely small amount of time
19. a coherent set of representations that allows us to explain an object's motion and to predict where the object will be at a future.
20. splitting a vector into two perpendicular vectors that are parallel to a coordinate axis.
22. the magnitude of a vector.
23. a digit reliably known.
24. a system that interacts with another system to extract and store information about it. It can be a person, a machine, or any other physical system
26. the change of an object's position with time.

1. the motion of an object moving under the influence of gravity only, and no other forces.
2. the term for the length or size of a vector.
5. the acceleration of any two objects in free fall regardless of mass.
7. a highly simplified picture of reality.
8. two vectors parallel to an axis.
12. an object that can be represnted as a mass at a single point in space.
14. the system of units used in science.
17. a ratio that compares two quantities with different units of measurement, essentially expressing how much of one quantity changes with respect to another quantity, often written as a fraction where the numerator represents the first quantity and the denominator represents the second quantity
18. an object that is thrown or launched into the air and is only significantly influenced by the force of gravity during its flight, meaning the only force acting on it is essentially gravity after the initial launch; its path is called a trajectory
21. versus time graph, a continuous line or curve showing an object's positions as a function of time.
25. a quantity described by both a magnitude and a direction.