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matter and motion

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
What is an object that appears to stay in place?   reference point  
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What is an objects change of position relative to its reference point?   motion  
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What are some examples of reference directions?   north,east,south,west  
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What is the unit for speed?   meters per second  
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What is the average speed formula?   distance/time  
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What must velocity include?   a reference point  
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An objects velocity is constant only if its _______ and ______ changes   speed and directions  
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What is the rate at which velocity changes?   acceleration  
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What changes when speed changes?   velocity  
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What is an increase in velocity?   positive acceleration  
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What is a decrease in velocity?   negative acceleration  
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What unit is acceleration expressed in?   meters per second  
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What is a push or a pull?   a force  
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What two things do forces have?   size and direction  
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What is a change in an objects motion caused by?   a force  
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What is the unit that force is expressed in?   newtons  
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What is the combination of all the forces acting in an object?   net force  
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When two forces act in opposite directions, what direction determines the net force?   the larger one  
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When the forces on an object produce a net force of 0N, the forces are ________   balanced  
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When the net force is not at 0N, the forces on the object are _________   unbalanced  
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Unbalanced forces produce a change in what two things?   motion and direction  
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Unbalanced forces are necessary to make a nonmoving object start doing what?   moving  
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What is the force that opposes motion between two surfaces that are in contact?   friction  
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The surface of an object has to be ______ to have friction   rough  
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Friction depends on what two things?   1.pushing the surfaces together 2. the roughness of the object  
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Does changing the amount of surfaces that come in contact effect the amount of friction?   NO  
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What are the two types of friction?   Kinetic friction and static friction  
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What has a larger force? (kinetic or static friction)   kinetic friction  
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What are lubricants?   substances that reduce the amount of friction on an object  
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You can increase a force by...?   pushing the surfaces together  
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Created by: ReidRoberts14
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