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Motion and Forces Test 1
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Gravity
Terms in this set (20)
motion
the state in which one object's distance from another is changing
reference point
a place or object used for comparison to determine if an object is in motion
International System of Units (SI)
a system of measurement based on multiples of ten and on established measures of mass, length, and time
meter
the basic SI unit of length
speed
the distance an object travels per unit of time
average speed
the overall rate of speed at which an object moves; calculated by dividing the total distance an object travels by the total time
instantaneous speed
the speed of an object at one instant in time
velocity
speed in a given direction
slope
the steepness of a line on a graph,equal to its vertical change divided by its horizontal change
acceleration
the rate at which velocity changes (an object's velocity is its speed and direction)
friction
the force that opposes the motion of one surface as it moves across another surface
rolling friction
friction that occurs when one object rolls over another
static friction
friction that acts on objects that are not moving
sliding friction
friction that occures when one solid surface slides over another.
fluid friction
friction that occurs as an object moves through fluid
unbalanced forces
the forces acting on a object that cause a change in velocity; making the object speed up, slow down, or change direction
balanced forces
equal forces acting on an object in opposite directions
newton (N)
the SI unit of force
force
a push or pull
net force
the combination of all forces acting on an object
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