Physics
acceleration the rate of change of velocity (48)
average velocity total displacement divided by the time interval during which
the displacement occurred (43)
displacement the change in position of an object (41)
frame of reference a coordinate system for specifying the precise location of
objects in space (40)
free fall the motion of an object falling with a constant acceleration (60)
instantaneous velocity the velocity of an object at some instant (or specific
point in its path) (46)
• Displacement is not always equal to the distance traveled
• Displacement can be positive or negative
• Average velocity is displacement divided by the time interval
• Velocity is not the same as speed
• Velocity can be interpreted graphically
• Instantaneous velocity may not be the same as average velocity
• Acceleration measures the rate of change in velocity
• Acceleration has direction and magnitude
• The slope and shape of the graph describe the object’s motion
• Displacement depends on acceleration, and time
• Final velocity depends on initial velocity, acceleration, and time
• Time can be found from displacement and velocities
• Freely falling bodies undergo constant acceleration
• What goes up must come down
• Freely falling objects always have the same downward acceleration
Key Ideas
• Displacement is a change of position in certain direction not the total distance traveled
• The average velocity of an object during some time interval is equal to the displacement of the object divided by the time interval. Like displacement velocity indicated both speed and direction
• The average velocity of an object is given by the following equation
• The average velocity is equal to the slope of the straight line connecting the initial and final points on a graph of the position of...
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