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15 Cards in this Set

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The Location of a place or an object
Position
A Location to which other locations are compared
Reference Point
A change of position over time
Motion
A measure of how fast something moves
Speed
A speed in a specific direction
Velocity
A quantity that has both size and direction
Vector
The rate at which velocity changes over time
Acceleration
Distance/Time =
Speed
(Final Velocity -
Intial Velocity)
/ Time =
Acceleration
Bill knows that a friend runs 200m in 10 sec. What is the speed? How do you know?
20 m/s
200m / 10 sec = 20 m/s
Tom walked 10 km in half hour. What is his average speed during the walk? How do you know?
20 km/hr
10 km / .5 hr = 20 km/hr
Jim and Tom run with the same constant speed but in opposite directions. The boys have...
Different Velocity
A cheetah can go from 0 m/s to 20 m/s in 2 seconds. What is the acceleration? How do you know?
10 m/seconds squared
(20 m/s - 0 m/s)/ 2sec = 10 m/s*s
A car traveling at 40 m/s slows to 20 m/s. The car has...
How do you know?
Negative Acceleration
(20 m/s - 40 m/s)/ time = a negative number; thus negative acceleration
If two trains are traveling at 60 mph, could they have different Velocity's?
Yes, they could be going in different directions.