Ch. 2 Motion
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19 Terms
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time graph
On a distance- ________, the distance is plotted on the vertical and horizontal axis; each axis must have a scale that covers the range of numbers to be plotted.
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SI unit
The ________ for acceleration is m /s2.
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Earth
________ is constantly accelerating constantly as it orbits the Sun in a nearly circular path.
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law of inertia
The ________ can explain what happens in a car crash.
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horizontal axis
Time is plotted on the ________.
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reference point
A(n) ________ must be specified in order to determine an objects position.
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slope of a line
The ________ on a distance- time graph is equal to the speed.
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Acceleration
________ occurs when an object changes speed or changes direction.
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Motion
________ occurs when an object changes its position relative to a reference point.
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Distance
how far an object moved
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Displacement
distance and direction of an objects change in position from the starting point
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Speed
distance an object travels per unit of time
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Average Speed
the total distance traveled divided by the total time of travel
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Instantaneous Speed
the speed at a given point in time
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Velocity
the speed of an object and the direction of its motion
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force
a push or pull
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Net force
formed when two or more forces act on an object at the same time
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Balanced forces
forces on an object that are equal in size and opposite in direction
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Inertia
the tendency of an object to resist any change in its motion
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