Newton's First Law of Inertia (old class)

Chapter 2

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