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Science chapter 1
Terms in this set (36)
the rate at which velocity changes
Acceleration involves a change in either ______________ or ________________.
speed or direction
Anytime the speed of an object increases ,the object undergoes _______________________.
Acceleration refers to increasing speed, decreasing speed, or changing direction.
Can an object be accelerating even if its speed is constant?
What are some examples of acceleration?
A car follows a gentle curve in the road,A batter swings a bat to hit a ball,A runner slows down after finishing a race.
What is the formula for acceleration?
Acceleration: final speed -Initial speed divided by time
To determine the acceleration of an object what must you calculate?
change in speed per unit of time
to calculate the acceleration of an automobile , you must subtract the final speed from the initial speed
the moon revolves around the earth at a fairly constant speed .is the moon accelerating?
yes ,it is changing direction
if an object is moving w/o changing direction ,then its acceleration is the change in its speed during one unit of time ...
,then its acceleration is the change in its speed during one unit of time
if an objects speed changes by the same amount during each each unit of time ...
then the acceleration of the object at anytime is the same
if an objects acceleration varies...
then you can describe only average acceleration
earths rocky outer shell is all one piece
the upper layer of earth consists of more than a dozen major pieces called ...
theory of plate tectonics
the theory states that earths plates move slowly in various directions
what is true about earths plates?
some plates push toward each other, some plates glide past each other , some plates pull away from each other
the speed of earths plates is very slow
by knowing the average speed of a plate , what can scientists estimate about earths continents?
what is the formula used to predict how far a plate will move in a certain amount of time ?
distance: speed x time
the shapes and positions of earths continents will not change in the future
An object is in _______________ when its distance from another object is changing.
What is a reference point?
a place or object used for comparison to determine if something if something is in motion
An object is in motion if it changes position relative to a[n] _______________________________.
what does SI stand for?
international system of units
what is the basic unit of length?
what does the prefix MILLI mean?
how many centimeters are there in a meter?
how many meters are there in a kilometer?
what is used to calculate the speed of an object ?
distance divided by time
how do you find the average speed of a cyclist throughout an entire race ?
total distance divided by total time
the rate at which an object is moving in a given instant in time
what is speed in a given direction?
what do you need to determine velocity?
speed and direction
What is the slant of a line on a graph called?
the steepness of a distance versus time graphs slope depends on how quickly or slowly the object is moving.
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