## MPCS 9th Science Ch 11 Test

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erichardson008  on February 4, 2009

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# MPCS 9th Science Ch 11 Test

 Name 3 vector quantities.displacement, direction, velocity
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#### Definitions

Name 3 vector quantities. displacement, direction, velocity
What is the displacement of a person who walks around the block and ends up where they started? The displacement doesn't move to a straight location.
What is the RATIO of the distance traveled by an object to the time an object takes to travel that distance? average speed or v = d/t
Explain instantaneous speed. The rate at which an object is moving at a given moment in time. The speed is always moving at a constant. The car's speedometer measures its instantaneous speed.
Compare instantaneous speed to average speed. Averrage speed is computed for the ENTIRE duration of a trip, and instananeous speed is measured at a particular instant.
What is the unit for speed? meters per second (m/s)
What is the unit for distance? meter
What is the unit for velocity? kilometers per hour km/h
What is the unit for displacement? any measurement of length
What does a horizontal line on a distance time graph represent about the motion of an object? It is not moving.
What is the rate at which velocity changes? Acceleration
List two ways in which an object can accelerate. Speed and direction
What is displacement? The direction from the starting point and the length of a straight line from the starting point to teh ending point.
Vectors are quantities that have what two things? magnitude and direction
What do you call the vector that is the sum of two or more vector? resultant vector
What is the displacement of a boy who moves 5 feet east and then 3 feet west? 5 feet - 3 feet = 2 feet (Add when they are going in the same direction and subtract when going in opposite directions)
What is the total distance of a boy who moves 5 feet east and then 3 feet west? 8 feet (Because he moved his feet a total of 8 feet)
If your initial speed is 5 m/s and you accelerate to a speed of 12 m/s in 4 seconds, what is your acceleration? 7 m/s (5 + what = 12)
An object moving at 30 m/s comes to a stop in 5 seconds. What is the objects acceleration? 6 m/s (30 divided by 5)
During a race, a runner running at a speed of 6 m/s increases her speed to 10 m/s in 4 seconds. What is her acceleration? 4 m/s (6 plus what = 10)
Tell a story about a person's motion that results in that person traveling a total of 100 meters, but having a displacement of zero. It is like a person who walks or runs around a block of their neighborhood, starting at their house, circling the block, and ending back up at their house.

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