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# matter and motion

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