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DDMS 7th grade - Chap 16, sections 1 & 3

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The state in which one object’s distance from another object is moving   Motion  
A place or point used for comparison to determine if an object is in motion   Reference Point  
A version of the metric system used by scientists all over the world   Internation System of Units (SI)  
The SI unit for length   Meter  
The distance that an object travels per unit of time   Speed  
What is the formula (equation) used to find speed   S = D/T; Speed = Distance/Time  
Tell a metric unit for speed   Km/hr, m/s  
The overall rate of speed that an object moves, comparing the total distance traveled and the total time   Average Speed  
The rate of speed that an object is moving at a particular instant or time   Instantaneous Speed  
Speed in a given direction   Velocity  
The steepness of a line on a line graph   Slope  
How do you calculate the slope of a line?   Slope = Rise/Run  
On a graph that shows Distance V/S Time, what does the slope of the line represent?   The Speed  
On a graph that shows Distance V/S Time, what does a steep slope mean?   The speed is fast  
On a graph that shows Distance V/S Time, what does a gradual slope mean?   The speed is slow  
On a graph that shows Distance V/S Time, what does a horizontal line mean?   Slope = 0, so the object is not moving.  
The rate at which the velocity of an object changes   Acceleration  
What are the three things that can cause acceleration?   Increase in speed, Decrease in speed, or Change in direction  
What is the formula (equation) used to find acceleration?   A = (Final Speed - Initial Speed)/Time  
What is the metric unit for acceleration?   (m/s)/s or m/s2  
What does it mean if an object has a positive acceleration?   It is speeding up  
What does it mean if an object has a negative acceleration?   It is slowing down  
What does it mean if an object has no acceleration (A = 0)?   It is moving at a constant speed  


   


 

 

 

 

 

 
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