Term
A frame of refernce is necessary to...
|
|
Definition
| to describe motion accurately and completely |
|
|
Term
|
Definition
a system of objects that are not moving with respect to another |
|
|
Term
|
Definition
Relative motion-movement in relation to a frame of reference |
|
|
Term
|
Definition
length of a path between two points - When object moves in straight line, distance is length of line connecting object’s starting point and ending point
|
|
|
Term
| What is the SI unit for measuring distance? |
|
Definition
meters(m) - Very large distances-kilometers(km)
- Distances smaller than meter-centimeters(cm)
|
|
|
Term
|
Definition
direction from starting point and length of straight line from starting point to ending point - Displacements sometimes used when giving directions.
|
|
|
Term
|
Definition
quantity that has magnitude and direction |
|
|
Term
|
Definition
combining of vector magnitudes and directions. *Add displacements using vector addition |
|
|
Term
| You add two displacements, represented by vectors when they have ____ direction |
|
Definition
|
|
Term
| You subtract two magnitudes, when they are in ____ direction |
|
Definition
|
|
Term
| When two or more displacement vectors have different directions, they may be combined by |
|
Definition
|
|
Term
|
Definition
| vector sum of two or more vectors |
|
|
Term
|
Definition
a. ratio of distance that an object moves to amount of time the object moves |
|
|
Term
|
Definition
|
|
Term
|
Definition
| computed for entire duration of trip |
|
|
Term
|
Definition
-measured at a particular instant - rate at which object is moving at given moment in time |
|
|
Term
|
Definition
average speed= total distance total time _ v= d t |
|
|
Term
| distance-time graph is a good way to describe ____ |
|
Definition
|
|
Term
| Slope of line on distance-time graph is the _____ |
|
Definition
speed *Steaper slope on distance-time graph indicates higher speed |
|
|
Term
|
Definition
speed and direction in which an object is moving |
|
|
Term
| two or more velocities add by vector ___ |
|
Definition
|
|
Term
|
Definition
rate at which velocity changes - Acceleration can be described as changes in speed, changes in direction, or changes in both
|
|
|
Term
Acceleration applies to any change in object’s _____
|
|
Definition
|
|
Term
|
Definition
movement of an object toward Earth solely because of gravity |
|
|
Term
|
Definition
| meters per second per second(m/s22) |
|
|
Term
|
Definition
9.8 meters per second squared(9.8 m/s2) --> ~ 10 m/s2 |
|
|
Term
| You can still accelerate when speed is _____ |
|
Definition
|
|
Term
Sometimes motion is characterized by changes in both _____ and _____ at the same time |
|
Definition
|
|
Term
|
Definition
| steady change in velocity |
|
|
Term
Velocity of an object moving in a straight line changes at a _______ when the object is experiencing constant acceleration. |
|
Definition
|
|
Term
You calculate acceleration for a straight-line motion by... |
|
Definition
| diving change in velocity by total time |
|
|
Term
|
Definition
average acceleration=change in velocity total time _ a=Vf=Vi t
|
|
|
Term
If motion is in straight line, velocity can be treated as___ |
|
Definition
|
|
Term
| The slope of speed-time graph is the: |
|
Definition
|
|
Term
Constant acceleration represented on speed-time graph by |
|
Definition
|
|
Term
|
Definition
| displayed data form straight-line parts |
|
|
Term
Accelerated motion is represented by a ___ line on distance-time graph |
|
Definition
|
|
Term
|
Definition
| curve connects plotted data points |
|
|
Term
| instantaneous acceleration- |
|
Definition
| how fast a velocity is changing at a specific instant. |
|
|
