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# Chpt. 5 Motion

### Chapter 5 motion science

Change in position over time relative to a reference point Motion
Common Reference Point Earth's Surface
Distance/Time Speed
Speed doesn't change Constant Speed
Total Distance/Total Time Average Speed
Object that travels at a normal speed Average Speed
Speed in a given direction Velocity
Combine Velocities by adding or subtracting Resultant Velocities
Combine Velocities in the same direction Adding
Combine Velocities in opposite directions Subtracting
Rate of change in Velocity Acceleration
Increase in Acceleration Positive Acceleration
Decrease in Acceleration Negative Acceleration or Deceleration
Push or Pull and Expressed in Newtons Force
Combination of all of the forces acting on an object Net Force
Force applied in same direction Balanced Force
Net Force is... Zero Newtons
Object at...will stay at... Rest, Rest
Combined Net Force Doesn't equal Zero
A Force that opposes Motion between two surfaces that come in contact with each other Friction
2 types of Friction Kinetic and Static Friction
Friction between two moving objects Kinetic Friction
Friction between two NOT moving objects Static Friction
Use Lubricants or Smoother Surfaces Reduce Friction
Make surfaces rougher Increase Friction
Force of Attraction between objects due to their masses Gravity
Stated that gravity is a invisible force which can cause objects to move Sir Issac Newton
Gravitational Force... as mass increases Increases
Gravitational Force... as distance increases Decreases
Weight Depends on the Force of Matter
A measure of the force of gravity and measured in Newtons Weight
...is Amount Mass
Created by: court0701