HPhys2
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Position:
separation from a reference point

Distance:
separation between two objects

Scalar:
a quantity that only has magnitude or size

Vector:
a quantity that has both magnitude and direction

Displacement:
magnitude and direction of an object’s change in position (a vector); can be positive or negative

Distance:
a scalar quantity

Speed:
ratio of distance traveled to time interval

Velocity:
ratio of change in position to time interval over which change took place

Constant velocity:
if v is the same for all time intervals

Slope of positiontime graph
is velocity

If positiontime graph is a straight line
object is moving at constant velocity.

Instantaneous velocity:
velocity of an object at a given instant

Instantaneous velocity
is slope of the tangent at the time on a positiontime graph

Acceleration:
ratio of the change in velocity to the time interval over which it occurs.

Slope of velocitytime graph
is acceleration

For uniform acceleration
Velocitytime graph is a straight line

Area under a velocitytime graph
is displacement.

Area under accelerationtime graph
is change in velocity.

Acceleration is constant during upward or downward motion