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Chapter 2
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Support Force (Normal Force)
the force that supports an object against gravity
Gravity
the downward force on an object caused by earth’s pull
Friction
a force that resists motion between two surfaces that touch
makes things slow down or stop
Mass
the amount of matter in an object (in kilograms)
related to inertia
Inertia
the tendency of an object to resist a change in motion
more mass = more _____
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
Force
a push or a pull
Net Force
the total of all forces acting on an object
same direction = add N
opposite = subtract N
Vector
a quantity that has both magnitude and direction
Scalar
a quantity that has only magnitude
Resultant
the sum of two or more vectors
Equilibrium
a state of balance- all forces cancel out —> no change in motion
Static Equilibrium
object at rest
Dynamic Equilibrium
object moving at constant speed in a straight line
Acceleration
the rate at which velocity changes
Copernicus
said earth circles the sun
Galileo
introduced inertia; proved objects of different weights fall at the same rate (without air resistance)
Aristotle
thought heavier things fall faster, and objects “want” to be at rest