# Shared Flashcard Set

## Details

Chapter 2
Describing Motion/Acceleration
24
Physics
02/23/2014

Term
 Define: motion
Definition
 when an object changes its position relative to a reference point
Term
 Define: distance (d)
Definition
 how far an object has moved
Term
 Define: displacement
Definition
 distance and direction of an object's change in position from the starting point
Term
 Define: speed
Definition
 distance an object travels per unit of timespeed= distance/time
Term
 Define: rate
Definition
 any change over time
Term
 Define: constant speed
Definition
 speed that does not change over time
Term
 Define: changing speed
Definition
 speed that changes over time
Term
 Which is more common? Constant speed or changing speed?
Definition
 changing speed
Term
 Define: average speed
Definition
 speed of motion when speed is changingaverage speed= total distance/total time
Term
 Define: instantaneous speed
Definition
 speed given at any point in time
Term
 What displays motion of an object over time?
Definition
 a distance-time graph
Term
 What is plotted on the y-axis of a distance-time graph?
Definition
 distance
Term
 What is plotted on the x-axis of a distance-time graph?
Definition
 time
Term
 Define: velocity
Definition
 speed and direction of an object's motion
Term
 Why do we not notice the movement of the Earth's crust?
Definition
 because it is so slow
Term
 Define: acceleration
Definition
 change in velocity's rateacceleration= change in velocity/time
Term
 Define: positive acceleration
Definition
 speed is increasing (exceleration)
Term
 Define: negative acceleration
Definition
 speed is decreasing (deceleration)
Term
 What causes a change in acceleration?
Definition
 change in speed and/or direction
Term
 Describe how to calculate change in velocity.
Definition
 final velocity-initial velocity
Term
 What unit is used to measure acceleration?
Definition
 meters/seconds squared
Term
 What displays acceleration of an object over time?
Definition
 a velocity-time graph
Term
 A velocity-time graph showing positive acceleration would have what kind of slope?
Definition
 positive
Term
 A velocity-time graph showing negative acceleration would have what kind of slope?
Definition
 negative
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