# Physics vocab 1

### 22 terms by miumiu97

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### Kinematics

Description of motion

causes of motion

### Vector

Has both magnitude and direction

Only magnitude

### Distance

The length of path traveled

### Velocity

Rate of change in position

### Position

location of an object with respect to a reference point

### Displacement

Change in position in a particular direction

### Aristotle

384-322BC
early thinker, influenced people's thinking for nearly 2000 years

### Copernicus

1543
one of first to contradict Aristotle

### Galileo

1547-1642
- continued to take issue with Aristotle's ideas
- conducted thought experiments

Study of motion

### Speed

The rate of change of distance

### Constant velocity

object has the same velocity for the entire trip
(Graph is a straight line)

### Changing Velocity

object has many different speeds and directions during a trip

### Average velocity

found by dividing total displacement by total time

### Instantaneous velocity

the velocity at any moment in time

### Acceleration

The rate of change of velocity

### Free-Fall

state of an object when the only force acting on it is gravity.

### g

Free-fall acceleration
called "the acceleration due to gravity"
9.80m/s/s

### Acceleration is Absolute

can be measured without making a comparison to something else; acceleration can be felt

### Velocity is Relative

In order to measure it, a comparison must be made to something else.

Example: