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32 Cards in this Set
- Front
- Back
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What is Newton's first law?
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Every object continues in a state of rest or of uniform speed in a straight line unless acted on by a nonzero net force.
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What is a vector quantity?
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A quantity whose description requires both magnitude (how much) and direction (which way)
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What is net force?
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Net force is the combination of all forces that change an object’s state of motion.
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What is the equilibrium rule?
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The vector sum of forces acting on a non-accelerating object equals zero.
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What is support force?
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Support force (normal force) is an upward force on an object that is opposite to the force of gravity.
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What is equilibrium?
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A state of no change with no net force acting
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Motion is ...
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Relative
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Speed is defined as...
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the distance covered per
amount of travel time. |
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Average speed is...
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The entire distance covered divided by the total travel time
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Instantaneous Speed is...
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the speed at any instant.
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Velocity is...
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A description of
–the instantaneous speed of the object –what direction the object is moving -A vector quantity |
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Constant speed is...
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steady speed, neither speeding up nor slowing down.
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Constant velocity is...
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–constant speed and
–constant direction (straight-line path with no acceleration). |
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Acceleration is...
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the rate at which velocity changes over time... it involves a
•change in speed, or •change in direction, or •both. |
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Free fall is...
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Falling under the influence of gravity only -with no air resistance
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Free falling objects on planet Earth accelerate at a rate of...
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9.8 m/s^2
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Force causes...
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Acceleration
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Acceleration depends on/ is directly proportional to...
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the net force
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The force of friction depends on...
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the kinds of material and how hard they are pressed together
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Mass is...
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The quantity of matter in an object. It is also the measure of the inertia or sluggishness that an object exhibits in response to any effort made to start it, stop it, or change its state of motion in any way.
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Weight is...
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The force upon an object due to gravity.
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How are mass and weight different?
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•on the Moon and Earth:
–Weight of an object on the Moon is less than on Earth. –Mass of an object is the same in both locations. Mass and Weight |
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1 kilogram weighs how many newtons?
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9.8 N
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1 pound weighs how many newtons?
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4.45 N
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Acceleration is inversely proportional to...
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mass
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What is Newton's second law?
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The acceleration produced by a net force on an object is directly proportional to the net force, is in the same direction as the net force, and is inversely proportional to the mass of the object.
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What is terminal speed?
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occurs when acceleration terminates (when air resistance equals weight and net force is zero).
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What is terminal velocity?
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same as terminal speed, (acceleration terminates, and air resistance equals weight and net force equals zero) with direction implied or specified.
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Interaction is...
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•is between one thing and another.
•requires a pair of forces acting on two objects. |
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What is Newton's third law?
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Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.
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What is a scalar quantity?
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•has magnitude.
Example: mass, volume, speed |
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What is a resultant?
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•The sum of two or more vectors
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