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SMS 8 Sci. Vocab

Nature of Force etc...

QuestionAnswer
force a push or pull
net force the overall force acting on an object after the forces are added together
unbalanced force cause an object to start moving, stop moving, and change direction
balanced force equal forces acting on one object in opposite directions DO NOT change the object's motion; the net force is zero because balanced forces cancel each other.
inertia tendency of an object to resist change in its motion
mass amount of matter in an object (measured in kilograms - Kg; 1 Kg = 1000 grams)
newton unit of measurement one newton = the force required to accelerate one Kg of mass at 1 meter per second per second 1N = 1 kg X 1 m/s2
friction force that one surface exerts on another when the two rub against each other; this force acts in a direction opposite to the object's direction of motion. Since this force opposes motion, the object will slow down and eventually stop moving.
sliding friction when solid surfaces slide over each other
rolling friction when an object rolls over a surface
fluid friction the friction that occurs when an object moves through a liquid or a gas
gravity the force that pulls objects towards each other (This force pulls objects down toward the center of the Earth.)
air resistance --- Air resistance increases as velocity increases fluid friction / upward force that varies for different objects (the greater the surface area, the more air resistance; EX. a leaf falls slower than an acorn.)
terminal velocity the greatest velocity that an object reache
weight the force of gravity on a person or object at the surface of a planet
Universal Gravitation the force of gravity acts between all objects in the universe
momentum the product of an object's mass and velocity M = m X v
law of conservation of momentum total momentum is exactly the same before and after the accident.
Created by: SimardRR
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