# science motion unit

## 50 terms

### Motion

a change in position

### Rate

any change over time

### Speed

how fast an object is moving

### Instantaneous speed

the rate of motion at any given instant

### Constant speed

the rate of motion does not vary (change)

### Average speed

total distance traveled divided by total time of travel

### Velocity

the measure of speed in a given direction

stationary

### Frame of reference

the object that is used for comparison of motion

### An object's speed varies depending on your ___________________

frame of reference

speed

distance, time

distance/time

scalar

### What are the three types of speed?

instantaneous, constant, and average

vector

size

### Vector

size and direction

### Because velocity is a vector, if either value (speed or direction) changes, _____________

velocity will change

### The unit for velocity is always expressed as a _________ over a ___________ and a _____________

distance, time, direction

### Dimensional Analysis

too for solving word problems; allows you to convert from one unit to another

### How to find metric conversion factors

1) set the larger unit equal to one
2) count jumps to the right for the number of zeros in the smaller unit
3) set the measurements equal to each other for your conversion factor

### What's important to make a graph accurate?

the title, labels for the X and Y axis, intervals should be spaced appropriately, and lines should be straight and labeled

velocity

### the steeper the slope, the __________________

faster the object is moving

### Any straight line means the object is moving at a ______________ during that period of time

constant velocity

slope

### Vectors

quantities that have a size and a direction

arrows

speed

greater

direction

added

subtracted

### Accelertation

the rate of change in velocity

### acceleration will occur if either _______ or ________ is changed, which in turn changes velocity

speed or direction

velocity

### a decrease in the change in velocity is often referred to as ____________________

negative accleeration

negative

### an increase in the change in velocity is often referred to as ___________________, or just _____________

positive acceleration, acceleration

positive

### the size of accleration depends on both the ___________________ and the _____________

changes in velocity and the time interval

### Time interval

the amount of time passed while the change in velocity takes place

large

small

### the unit for acceleration is

distance/time/time

9.8m/s/s

acceleration

acceleration

constant