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16 Cards in this Set
- Front
- Back
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Speed
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The rate of motion, or the rate at which a body changes position.
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Average Speed
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The rate of motion determined by dividing the total distance traveled by the total travel time.
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Instantaneous Speed
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The rate of motion at a given instant in time, such as that given on a car's speedometer.
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Velocity
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The speed and direction of a moving body, such as a storm or a basketball thrown across a court.
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Acceleration
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The rate of change in velocity (a change in direction or a change in speed). The amount of acceleration depends on velocity change and time interval.
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Mass
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A measure of the amount of matter in a object; its SI unit is the kilogram (kg).
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Inertia -The tendency of an object to resist any change in its motion.
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If it is motionless, it tends to remain at rest; if moving, it tends to keep moving at the same speed and in the same direction.
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Momentum
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A property of any moving object; the momentum (p) of an object is the product of its mass and velocity (p = mv).
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Law of Conservation of Momentum
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A law stating that the total momentum of a group of objects is conserved unless a net force acts on the objects.
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Constant Speed
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Speed that does not change.
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Force
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A push or pull one body exerts on another. Unbalanced forces always change the motion of the body.
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Balanced Forces
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Forces that are equal in size and opposite in direction; balanced forces acting on a body do not change the motion of the body.
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Net Force
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The sum of the forces on an object when unbalanced forces are applied to it. A net force changes the object's speed or direction or both.
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Friction
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The force that opposes motion between two surfaces that are touching each other.
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Gravity
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Force exerted by every object in the universe on every other object. The amount depends on the masses of the objects and the distance between them.
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Weight
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The measure of the force of gravity on an object. Weight changes with changes in gravity and is measured in newtons (N).
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