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unbalanced
force that changes the motion of an object; net force ≠0 (speeds up, slows, turns, stops, starts)

balanced
force that does not change the motion of an object; net force =0 (constant speed, no change in direction)

1st Law
Newton's Law of Motion states objects will remain at rest, OR in constant motion, at a constant speed and in a straight line UNLESS acted on by an unbalanced force. Law of inertia.
speed
How fast or slow something is moving, such as 60 km/h , or 6 cm/s. Divide the distance traveled by the time traveled

velocity
Speed with direction (50 miles per hr North)

inertia
resistance to a change in motion; resistance to a force; directly proportional to mass. This is why we wear seatbelts in a car.

x-axis
horizontal line on a graph

y-axis
vertical line on a graph

increase
go up, more

decrease
goes down, less

conduction
direct transfer of heat from one substance to another substance that it is touching. Example: burning your tongue on hot food, ice melting in your hand

convection
heat rises. transfer of thermal energy by the circulation or movement of a liquid or gas. Examples: Ocean currents, heating vent, Earth's mantle

radiation
transfer of energy by electromagnetic waves. Examples: heat from the sun, or microwave oven

gravity
force that pulls objects toward each other, is an unbalanced force if it causes a change in velocity.

kinetic
energy of motion; High temperatures have more. Low temperatures have less.

Isaac Newton
British scientist that developed the three laws of motion

3rd Law
Newton's Law states for every action there is an equal and opposite reaction. Force pairs. Action reaction.

friction
unbalanced force that opposes motion, slowing objects on a surface.

equal
having the same value

opposite
acting or going in the reverse direction

force
push or a pull

acceleration
change of speed and/or direction
mass
amount of "stuff", or matter, in something

divide
math operation used to calculate speed, used to calculate acceleration
