34 terms

# Motion and Forces

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Force
a push or a pull
Net Force
the force after the counteracting force
Unbalanced force
whenever there is a net force acting on an object
Balanced Force
equal forces acting on one object in opposite directions
motion
object is in motion if its distance from another object is changing
inertia
the tendency of an object to resist a change in motion or stay still
Mass
a measure of the amount of matter in an object
Newton (the unit)
The unit that measures the strength of a force (1 km in mass at 1 mile per second)
Friction
the force that two surfaces exert on each other when they rub against each other
Sliding Friction
when two solid surfaces slide over each other
rolling friction
when an object rolls over a surface
fluid friction
when a solid object moves through a fluid
gravity
a force that pulls object towards each other
weight
the force an object exerts on something toward the earth
momentum
is a characteristic of a moving object that is related to the Mass and the Velocity of the objects
terminal velocity
final speed
Law of conservation of momentum
in the absence of outside forces, the total momentum of the object that hit each other does not change
centripetal force
any force that causes an object to go in a circle
theory of plate tectonics
earth's land masses have changed position over time because they are part of plates that are moving slowly
Frame of reference point
A place or object used for comparison to determine if an object is in motion
Acceleration and deacceleration
increasing speed or decreasing speed or changing direction
Satellite
any object that orbits another object in space
Velocity
speed and direction
Speed
distance/time
Velocity
the speed and direction of an object's motion
Acceleration
SF-SI/time or force/mass
momentum
mass*velocity
Control Group
what you compare
Experimental Group
what you base the experiment on
Independent variable
what you change in an experiment
Dependent Variable
What you measure (measurements)
Newton's 1st Law of Motion
Objects at rest will remain at rest unless acted upon by an outside force.Objects in motion will remain in motion at the same velocity unless acted upon by an outside force.
Newton's 2nd Law of Motion
A=force/mass
Newton's 3rd Law of Motion
To every action there is an opposite and equal reaction.