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Science test chapter 9
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Gravity
Terms in this set (31)
And object in ______ when it's distance from another object is changing
Motion
What is a reference point
A place or object used for comparison to determine if something is in motion
An object is in motion if it changes position to a
Reference point
What Number is the international system unit based on
10
What is Basic unit of length according to the international system unit
Meter
How many centimeters are there in a meter
100
How many meters are there in a kilometer
1000
What is the formula used to calculate the speed of an object
Speed= distance
---------
Time
How would you find the average speed of a cyclist throughout an entire race
Divide the total distance traveled by the total time
Define Velocity
Speed in a given direction
In approaching storm is moving at 15 km/h. What do you need to know to determine its velocity?
The direction in which it's moving
The steepness or slant of a line on a graph is called it's
Slope
What is the formula used to find the slope of a line
Slope= rise
----
Run
What formula do scientists use to predict how far a plate will move in a certain amount of time
Distance= speedxtime
Conversion factor is a fraction in which the numerator and the denominator are
Equal
What is acceleration
Acceleration is the rate at which velocity changes
Acceleration involves a change in what two components
Speed and direction
Anytime the speed of an object increases, the object experiences
Acceleration
Acceleration of first to increasing speed decreasing speed or changing direction
True
An object can be accelerating even if it's speed is constant
True
The car following a gentle curve in the road
A batter swings a bat to hit a ball
And a runner slows down after finishing a race are examples of
Acceleration
Does the moon Accelerate
Yes because it's constantly changing direction
What must you calculate to determine the acceleration of an object
The change in velocity during each unit of time
What is the formula used to determine acceleration
Acceleration= Final velocity - initial velocity
---------------
Time
If an object is moving without changing direction then it's acceleration is a change in its speed during one unit of time
If an object speed changes by the same amount during each unit of time then the acceleration of an object at anytime is the same
If an objects acceleration varies then you can describe only average acceleration
Correct
Supposed velocity is measured in kilometers/hour and time is measured in hours. What is the unit of acceleration
Km/h^2
If a graph of distance versus time is a straight line in the graph shows a _______relationship
Linear
If a graph of a distance versus time is a curved line the graph shows a____ relationship
Nonlinear
If the motion of an object is accelerating what happens to the speed of the object overtime
The speed increases over time
If a graph line is slanted and straight what does this line show about the acceleration of an object
The acceleration is constant
Define speed
The distance and object travels in one unit of time
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