questions | answers |
the combination of all forces acting on an object | net force |
the strength of a force is measured in this SI unit | newton (N) |
when there is a net force acting on an object | unbalanced forces |
equal forces acting on an object | balanced forces |
the force that two surfaces exert on each other when they rub against each other | friction |
friction that acts on objects that are not moving | static friction |
occurs when two solid surfacesslide over each other | sliding friction |
when an object rolls over a surface | rolling friction |
fluids, such as water, oil, or air are materials that flow easily | fluid friction |
a force that pulls objects toward each other | gravity |
a measure of the amount of matter in an object | mass |
the force of gravity on a person or object at the surface of a planet | weight |
when the only force (gravity) is acting on an object | free fall |
objects falling through air experience this type of fluid friction | air resistance |
the greatest velocity a falling object reaches | terminal velocity |
an object that is thrown | projectile |
the tendency of an object to resist a change in motion | inertia |
a characteristic of a moving object that is related to the mass and the velocity of the object | momentum |
any object that orbits another object in space | satellite |
any force that causes an object to move in a circular path | centripetal force |
a push or a pull | forcw |