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Motion, Forces and Energy
Chapter 2
21
Physics
7th Grade
05/09/2008

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Cards

Term
balanced forces
Definition
equal forces acting on an object in opposite directions
Term
air resistance
Definition
the fluid friction experienced by falling objects through the air
Term
centripetal force
Definition
a force that causes an object to move in a circle
Term
fluid friction
Definition
friction that occurs when an object moves through a fluid
Term
force
Definition
a push or pull exerted on an object
Term
free fall
Definition
the motion of a falling object when the only force acting on it is gravity
Term
friction
Definition
the force that one surface exerts on another when the two rub against each other
Term
gravity
Definition
the force that pulls objects toward Earth
Term
inertia
Definition
the tendency of an object to resist any change in motion
Term
law of conservation of momentum
Definition
the rule that the total momentum of objects in an interaction doesn't change
Term
mass
Definition
the amount of matter in an object
Term
momentum
Definition
the product of an object's mass and velocity
Term
net force
Definition
the overall force on an object when all the individual forces acting on it are added together
Term
Newton
Definition
a unit of measurement that equals the force required to accelerate one kilogram of mass at 1 meter per second per second
Term
projectile
Definition
any object that is thrown or shot through the air
Term
rolling friction
Definition
friction that occurs when an object rolls over a surface
Term
satellite
Definition
any object that travels around another object in space
Term
sliding friction
Definition
friction that occurs when one solid surface slides over another
Term
terminal velocity
Definition
the maximum velocity a falling object can achieve
Term
unbalanced force
Definition
a nonzero net force, which changes an object's motion
Term
weight
Definition
the force of gravity on an object at the surface of a planet
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