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Science notes #2

QuestionAnswer
Motion An object is in motion if its distance from another object is changing.
Reference point An object used for comparison
Speed and Velocity Speed is distance over time.
Average speed total distance over total time
Instantaneous speed The speed at the exact moment
Velocity Speed in a specific direction
x axis Time
slope rise over run=distance over time=speed
y axis distance
acceleration Describes a change in velocity
acceleration can be an increase in speed, a decrease in speed, or a change in direction.
acceleration final speed over time
Velocity Describes a change in position
Distance over time graph has a curved line
Velocity over time graph has a straight line
acceleration rise over run=velocity over time= acceleration
Point on a graph piece of data
slope rate of change
Friction The force that two surfaces exert on each other when they rub against each other.
Friction acts in the direction opposite to motion
Strength of friction depends on how hard the surfaces push together and the types of surface involved
static Friction acts on an object that is not moving
Sliding friction acts when two solid objects slide over each other
Rolling Friction occurs when an object rolls over a surface
Fluid Friction occurs when a solid moves through a fluid
Gravity is a force that pulls object towards each other
The law of universal gravitation states that the force of gravity occurs between all objects in the universe
Air Resistance acts opposite to weight over gravity
Air resistance increase as surface area increases
Air resistance increase as velocity increasesh
Created by: lucinda ealey
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