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Kinematics

Description of motion

Dynamics

causes of motion

Vector

Has both magnitude and direction

Scalar

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

Mechanics

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.

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