32 terms

# Science Test Motion

#### Terms in this set (...)

Motion
Change in an objects position from a reference point
Reference point
Point where an object can be placed for a position
Position
Location of an object in relation to a reference point
Distance
How long something goes
Displacement
Distance and direction of an objects chance in motion
Same direction add and keep the sign: different directions subtract and keep direction of the larger: opposite direction like north and west use a2+b2+c2 (sorry couldn't get them to be exponents)
What are the rules of displacement
Speed
Distance an object travels per unit of time
Constant speed
Speed neither slows down or speeds up
Changing speed
Speed that is constantly changing
Average speed
Total distance traveled divided by the total time of travel
Instantaneous speed
Speed at any given point in time
Velocity
Speed of an object and direction of its motion
Relative motion
Motion that is happening at the time
Law of conservation of momentum
States that if no external forces act on a group of object the total momentum doesn't change
Momentum
Product of its mass and velocity
Acceleration
Rate of change of velocity
Two objects travel at the same velocity the object with more mass has a greater momentum
Comparing momentums
Circular motion
Acceleration toward the center of a curved or circler path
Projectile motion
Motion that causes something to curve or go downward
Velocity
An objects acceleration Is it's rate of change of ....
Speed and direction
Velocity depends on _____ and ____
Greater
The greater a boulders mass the ___ inertia it has
Direction
Displacement depends on an objects distance and ____ compared to a starting point
Negative
An car that slows down when approaching a stop sign has a ____ acceleration
100 meters west
A sprinter runs 200 meters west and 100 meters east what is her displacement
Time
Speed that can be calculated by dividing distance by___
Instantaneous
The speed of a motorcycle at a particular moment is it's ____ speed
Centimeters
Earths plates only move a few ___ per year
Velocities
Two cars are each traveling at 72 kph one car is traveling northeast and the other is traveling south the cars have different ___
Positive
When an object speeds up it has a ___ acceleration
Negative
When an objects final velocity is less than its initial velocity it has a ___ acceleration
Direction
An object that is changing ___ is even accelerating
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