## CPS4-Chapter 1

##### Created by:

IrisScience11  on January 21, 2010

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# CPS4-Chapter 1

 Natural MotionNatural motions, motions that have to do with the nature of bodies.
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#### Definitions

Natural Motion Natural motions, motions that have to do with the nature of bodies.
Violent Motion Motion resulted from a pushing or pulling force(unnatural).
Aristotle A famous philosopher-scientist in Greece, founded the two classes of motion.
Galileo First to build a telescope and discovered the concept of Inertia.
Force A push or a pull
Inertia The property by which objects resist changes in motion.
Mass Quantity of matter in an object.
Weight The force due to gravity on an object.
Kilogram A unit of mass.
Newton Scientific unit of force.
Volume Amount of space an object takes up.
Net Force Combination of all forces that act on an object.
Vector Quantity Quantity whose description requires both magnitude and direction.
Vector The arrow used to represent the magnitude and direction of a quantity.
Mechanical Eqilibrium When the net force of something is zero.
Equilibrium Rule The vector sum of forces action on a non accelerating object equals to zero (fancyEF=0)
Support Force Force that supports an object against gravity, also known as normal force.
Normal Force Force that supports an object against gravity, also known as support force.
Friction The resistive force that opposes the motion or attempted motion of an object trying to pass another of which it is in direct contact with.
Air Resistance Force of friction acting on an object due to its motion in air
Speed The distance traveled per time.
Instantaneous Speed Variations in Speed
Average Speed The total distance covered divided by the travel time.
Velocity The speed of an object and specification of its direction of motion.
Acceleration The rate at which velocity changes with time.
Deceleration When something slows down.
Free Fall Falling without air resistance, falling using only gravity.
Hang Time The time that one's feet are off the ground during a vertical jump.

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