chapter 10 test Flashcards
a newton
the si unit for magnitude or strength of a force
net force
the combination of all forces acting on a object
unbalanced forces
forces that cause an objects velocity to change
balanced forces
equal forces acting on one object in opposite directions
friction
a force that two surfaced exert on each other when they rub against each other
static friction
the friction that acts on objects that aren’t moving
sliding friction
when two solid surfaces slide over each other
rolling friction
when an object rolls across a surface
fluid friction
when a solid object moves through a fluid
gravity
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
free fall
when the only force acting on an object is gravity
air resistance
a type of fluid friction that acts on an object falling through the air
projectile
an object that is thrown
