Newton's First Law of Inertia

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Chapter 2

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18 Terms

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Support Force (Normal Force)

the force that supports an object against gravity

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Gravity

the downward force on an object caused by earth’s pull

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Friction

a force that resists motion between two surfaces that touch

makes things slow down or stop

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Mass

the amount of matter in an object (in kilograms)

related to inertia

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Inertia

the tendency of an object to resist a change in motion

more mass = more _____

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Newton’s First Law (Law of Inertia)

an object in motion (or at rest) will tend to stay in motion (or at rest) until it is acted upon by an outside force

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Force

a push or a pull

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Net Force

the total of all forces acting on an object

same direction = add N

opposite = subtract N

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Vector

a quantity that has both magnitude and direction

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Scalar

a quantity that has only magnitude

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Resultant

the sum of two or more vectors

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Equilibrium

a state of balance- all forces cancel out —> no change in motion

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Static Equilibrium

object at rest

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Dynamic Equilibrium

object moving at constant speed in a straight line

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Acceleration

the rate at which velocity changes

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Copernicus

said earth circles the sun

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Galileo

introduced inertia; proved objects of different weights fall at the same rate (without air resistance)

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Aristotle

thought heavier things fall faster, and objects “want” to be at rest