Question | Answer |
What is rolling friction? | When an object rolls accross a surface |
What is friction? | the force that one surface exerts on another when the two surfaces rub against each other |
SI | Unit of force-newton |
Weight | the force of gravity on an object at the surface of a planet |
inertia | the tendency of an object to resist any change in it's motion |
freefall | a motion of a falling object when the only force acting on it's gravity |
momentum | the product of an objects mass and veloctity |
satallite | any objsect that orbits around another object in space |
centripetal force | a force that couses an object to move in a circle |
force | a push or pull exerted on an object |
velocity | speed in a given direction |
Static friction | friction that acs on objects that are not moving |
sliding friction | friction that occurs when one solid surface slides over another |
fluid fraction | friction that occurs when an object moves through fluid |
gravity | the force that pulld objects toward each other. |
two factors that affect the gravitational pull between objects | mass and distance |
net force | the combination of all the forces acting on an object. |
unbalanced forces | can caouse an object to start moving, stop moving, or cange direction |
air resistance | the fluid friction experienced by objects falling through the air. |
terminal velocity | greatest velocity a falling objects reaches |
projectile | an object that is thrown |
newtons first law of motion | an object at rest will remain at rest, and object moving at a constant velocity will continue moving at a constant velocity, unbless it is acted uopn by an unbalanced force |
newtons second law of motion | acceleration depends on the object's mass and the net force acting on the object. |
acceleration= | = net/force |
newtons third law of motion | if one object exerts a force on another object, then the second objects exerts a force of an equal strength in the opposite direction on the first object |
momentum= | = mass x velocity |
laws of conservation | in an absence of outside forces, the total momentum of objects that interact does not change. |
total momentum | any group of objectsremain the same, or is conserved unless outside forces act on the objects |