23 terms

# Forces and Motion

Forces and Motion Vocabulary Review
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Force
is a push or a pull
Newton (N)
the unit for force
Balanced Forces
equal but opposite; occurs when the net forces on an object equals "zero" and the objects motion does NOT change
Unbalanced Forces
when the net forces on an object does NOT equal "zero" and the objects motion does change
Gravity
force of attraction between 2 objects; determined by the mass of the objects and the distance between them
Weight
a measure of the force of gravity on an object's mass
Mass
is the amount of matter or stuff in an object
Friction
a force that acts in the opposite direction of motion
Air Resistance
a fluid frictional force on falling objects that opposes gravity
Speed
the rate in which an object moves: calculated by distance / time
Acceleration
the change in velocity over a period of time
Frame of Reference
used to determine if an object is in motion; the background object that you assume is stationary in order to compare it to an moving object
Newton's 1st Law of Motion
an object at rest will stay at rest and an object in motion will stay in motion until an outside force acts upon it
Newton's 2nd Law of Motion
explains the relationship between acceleration, mass and force; Force=Mass x Acceleration
Newton's 3rd Law of Motion
for every action there is an equal and opposite reaction
Motion
caused by unbalanced forces acting on an object
Velocity
speed in a certain direction
Electric
force caused by non-moving charges
Magnetic
force caused by moving charges
Centripetal
it causes objects to travel in a circular path
Applied
a force exerted on an object by a person or another object
Normal
the support force exerted upon an object that is in contact with another stable object
Tension
force that is transmitted through a string, rope, cable or wire when it is pulled tight by forces acting from opposite ends