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29 Cards in this Set
- Front
- Back
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What is a place or object used for comparison to determine if something is in motion?
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reference point
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Where is the International System of Units used?
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all around the world
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If the speed of an object (that is in motion) does NOT change, how would you describe the speed of the object? The object is traveling at _______________ speed.
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constant
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What does the steepness of the slope of a line on a graph of motion depend on?
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how quickly or slowly the object is moving
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Changing direction is a kind of __________________.
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acceleration
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What is the unit of time used to measure acceleration? __________ if velocity is measured in kilometers per hour and time is measured in hours.
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kilometers per hour per hour
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What is the process called when rivers wear away rock and soil?
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erosion
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In an acceleration graph showing speed versus time, a straight line show the acceleration is doing what?
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it's staying constant
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What is happening to an object if its distance from another object is changing?
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it is in motion
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What can you determine about an object if you know the distance an object has traveled in a certain amount of time?
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speed of the object
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What do you divide by to determine speed?
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time
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What do you know about an object when you know both the speed and direction of an object's motion?
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velocity
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What is the average speed of a cyclist that travels 30 km in 2 hours?
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15 km per hour
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What does a horizontal line represent on a graph showing distance verus time?
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the object is not moving at all
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Why does the moon accelerate?
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because it changes direction
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What are the natural deposits that help keep rivers from flooding?
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leeves
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Where along a river does it flow slowly?
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its a shallow, narrow channel
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About how fast is Earth moving as it orbits the sun?
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30 km per second
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What can you say about an objects speed and average speed if the object moves in the same direction and at a constant speed for 4 hours?
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the speed is the same at all times during its motion.
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On a graph, you can show the motion of an object on a line graph in which you plot distances against _________.
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time
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When a force changes an object's motion, the force is ____________.
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unbalanced
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What are the many small streams that come together at the source of a river?
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head waters
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You must calculate the change in velocity during each unit of _____ to determine the acceleration rate of an object.
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time
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What is rare for any motion? For it to _____________________.
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stay the same for very long
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What are kilometers, meters and seconds?
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length/time units
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What can you find out about a car if you know it traveled 300 kilometers in 3 hours?
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average speed
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What is the basic SI unit of length?
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meter
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What is the average speed of a train that travels 100 kilometers in 4 hours?
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25 cm per hour
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What is the rate at which velocity changes?
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acceleration
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