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Grade 8 Forces Ch 2

Grade 8 Ch 2 Forces

QuestionAnswer
force a push or a pull
unbalanced force a net force is acting on an object; causes an object to start moving, stop moving. or change direction
net force the overall force on an object after all the forces are added together
balanced force equal forces acting in opposite directions; does not change the object's motion
inertia the tendency of an object to resist change in its motion
Newton's First Law An object at rest will remain at rest until acted on by an unbalanced force; an object in motion will stay in motion unless acted on by an unbalanced force
mass the amount of matter in an object
weight the pull of gravity on an object
kilogram, gram the SI unit of mass
Newton's 2nd Law the net force on an object is equal to the product of its acceleration and its mass (F= mass x acceleration)
Newton 1kg x 1 m/s/s; measurement of weight
friction the force that one surface exerts on another when the two rub together
sliding friction friction when solid surfaces slide over each other
rolling friction friction when an object rolls over a surface
fluid friction friction when an object moves through a fluid
gravity the force that pulls objects toward Earth
free fall when the only force acting on a falling object is gravity
9.8m/s/s the acceleration due to gravity
projectile an object that is thrown horizontally
air resistance fluid friction that falling objects experience
terminal velocity the greatest velocity a falling object reaches
Law of Universal Gravitation the force of gravity acts between all objects in the universe
Newton's 3rd Law For every action there is an equal and opposite reaction
momentum quantity of motion; Mass x velocity
Law of Conservation of Momentum when two objects collide in the absence of friction, momentum is not lost
satellite an object that travels around another object
centripetal force any force that causes an object to move in a circle
Created by: Dcoleman
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