Vocabulary Word | Definition |
net force | the sum of all the forces acting upon an object. |
momentum | The quantity of motion of a moving body, measured as a product of its mass and velocity. |
formula of momentum | p=mv |
law of conservation of momentum | the total momentum of any group of objects remains the same unless outside forces also act on the objects. |
force | push or pull. |
units of force | forces are measured in newtons |
Inertia | A property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force |
Balanced force | net force acting on an object is zero |
Unbalanced force | forces that produce a non-zero net force |
Magnitude | the amount of a measurement. |
Friction | The resistance that one surface or object encounters when moving over another. |
static friction | friction between nonmoving objects |
kinetic friction | friction between moving objects |
sliding friction | friction between objects that slide |
rolling Friction | occurs when an object rolls over a surface |
Fluid Friction | occurs when an object moves through a fluid or a gas |
Newtons First Law of Motion | In the absence of a net force, an object will continue with its present velocity. If it is at rest, it will stay at rest. If it is moving, it will maintain its velocity |
Newtons second law of motion | the rate of change of momentum is proportional to the imposed force and goes in the direction of the force |
Newtons third law of motion | every action force has an equal reaction force |
Law of universal gravitation | every point mass in the universe attracts every other point mass with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. |
free fall | motion of an object when only gravity is acting on it |
terminal velocity | constant speed that a freely falling object eventually reaches when the resistance of the medium through which it is falling prevents further acceleration |
weight | The force exerted on the mass of a body by a gravitational field |
mass | quantity of matter that a body contains |
centripetal force | force that acts on a body moving in a circular path and is directed toward the center around which the body is moving |
geosynchronous orbit | occurs when an object orbits another object at a rate equal to the 2nd objects rate of rotation. |
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