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# Linear Motion

### motion

the background or object that is used for to describe the motion of a body frame of reference
the most common frame of reference earth
a change in position in a certain amount of time motion
rate at which an object moves ---distance traveled/time of travel speed
unit for measuring speed meter(s) per second
speed of a body does not change constant speed
displacement/time average velocity
the speed of a body and the direction it travels velocity
velocities that are in the same direction are combined by adding them
velocities that are in the opposite direction are combined by subtract the small from the large velocity
the change in velocity of a body or a change in direction acceleration
change in velocity divided by the time during which this change occurs acceleration
a decrease in velocity is negative acceleration
an increase in velocity is positive acceleration
negative acceleration is known as deceleration
An object is __________________if its position reltive to a fixed point is changing. moving
How fast an object is moving speed
Formula for average speed is total distance / time interval
The speed of an object at a given moment in time instantaneous speed
How fast an object is moving and the direction of travel velocity
Velocity of an object does not change over time constant velocity
The rate at which velocity is changing acceleration
acceleration formula change in velocity / time interval
An object moving under the influence of gravity alone is called free fall
The acceleration of an object in free fall is about 10 meters per second squared
The formula for finding the weight of an object is mass times acceleration due to gravity
For each second of free fall, an object falls a _____________________ distance than it did in the previous second greater distance
On a speed -versus- time graph the slope represents speed per time, or __________ acceleration
Air resistance noticeably ___________ the motion of things with large surface area. slows
meters per second squared unit for acceleration