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motion and forces
Term | Definition |
---|---|
force | a push or a pull |
an object at rest stays at rest unless an __________ acts on it | unbalanced force |
inertia | the resistance of an object to an change in motion |
newtons first law | things at rest stay at rest, things in motion stay in motion unless acted upon by unbalanced forces |
newtons second law | f=ma |
newtons third law | every action there is an equal&opposite reaction |
mass | amount of matter in an object |
balanced forces | equal forces acting on an object in opposite directions |
net force | overall force on an object after all forces are added |
centripetal force | type of force that causes a satellite to orbit earth |
gravity | force that pulls things towards earth |
weight | force of gravity |
gravitational force | depends on mass and distance |
acceleration | depends on force and mass |
velocity | depends on speed and direction |
acceleration | change in speed or direction |
speed | distance an object travels per unit of time |
motion | when an objects distance from another is changing |
projectile | object that is thrown |
friction | force that one surface exerts on another when they rub against each other |
air resistance | type of friction that is an upward force on an object falling through air |
terminal velocity | greatest velocity a falling object reaches |
satellite | object that travels around another in space |