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# Chapter Ten

force is a push or pull
newton SI unit for the magnitude or strength
net force The combination or cumulative effect, of all the forces acting on an object to determine whether an object moves and also in which direction it moves
unbalanced forces will cause the velocity of an object to change...speed up, slow down, or change direction
balanced forces Equal forces acting on one object in opposite direction
friction is a force that two surfaces exert on each other they rub against each other
static friction friction that acts on objects that are not moving
sliding friction occurs when two solid surfaces slide over each other
rolling friction when an object rolls across a surface
fluid friction occurs when a solid object moves through a fluid
gravity is a force that pulls objects toward each other
mass The measure of the amount of matter in an object
weight the gravitational force exerted on a person or object at the surface of a planet Weight = Mass x Acceleration due to gravity
free fall when the only force acting on an object is gravity
air resistance a type of fluid friction acts on objects falling through air.
projectile an object that is thrown
compression is an elastic force that squeezes or pushes matter together
tension an elastic force that stretches or pulls matter
inertia is the tendency of an object to resist a change in motion
momentum quantity is a characteristic of moving object that depends on both the mass and velocity of the object
law of conservation of momentum states in the absence of outside forces, the total momentum of objects that interact does not change, or is conserved, unless outside forces act on the objects. The amount of momentum is the same before and after they interact.
Created by: gayledains