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Quinn science M2
Forces in Motion
Question | Answer |
---|---|
terminal velocity | the constant velocity of a falling object when the size of upward force of air resistance matches the size of the downward force of gravity, net force 0 Newtons |
free fall | the condition an object is in when gravity is the only force acting on it |
projectile motion | the curved path an object follows when thrown or propelled near the surface of the Earth, includes horizontal and vertical motion at the same time |
inertia | the tendency of all objects to resist any change in motion |
momentum | a property of a moving object that depends on the object's mass and velocity |
air resistance | fluid friction opposing motion through air, depends on size and shape |
orbit | moving forward at a constant speed and free fall occuring together |
centripetal force | unbalanced force tha causes objects to move in a circular path |
Newton's First Law | An object at rest remains at rest and an object in motion remains in motion at a constant speed and in a straight line unless acted on by an unblanced force, inertia |
Newton's Second Law | the acceleration of an object depends on the mass of the object and the amount of force applied |
Newton's Third Law | Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first, force pairs |
Law of Conservation of Momentum | any time two or more objects interact, they exchange momentum, but the total amound of momentum stays the same |
Galileo | proved the rate at which an object falls is not affected by the mass |
Parachutes | increase air resistance |
mass | a measure of inertia |
increase acceleration | increase force and/or decrease mass |
decrease acceleration | decrease force and/or increase mass |
unbalance forces | motion and net force is greater than zero |
balanced forces | no motion, net force is equal to zero |
mass | amount of matter in an object, never changes |
weight | measure of gravity, can change due to location |