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basic units from which all other units are made
units that are a combination of two or more of the fundamental units
1 hr = 3,600 s
1km = 1,000 m
to change an object's motion you need __ __.
the change an object's motion you need unbalanced forces.
constant or no motion means __ __.
constant or no movement means balanced forces.
three ways to describe motion
"zero" location in a frame of reference
frame of reference
a number line used to describe motion
separation between the object and reference point
- quantity that only has size/magnitude
- # and unit
- distance is scalar
- quantity that has size, magnitude and direction
- #, unit and direction
- acceleration, position, displacement, velocity
position at a certain time
- measures the separation between two objects
- needs no reference point
- scalar quantity
- change in position of an object (start point to end point)
- vector quantity
average velocity (v wit line)
the displacement of an object divided by the time interval over which it moved.
If the average velocity is the same throughout the time interval then we have __ __.
If the average velocity is the same throughout the time interval then we have constant velocity.
Speed vs. Velocity
speed: distance divided by time; scalar quantity
velocity: displacement divided by time; vecotr quantity
the rate of change of velocity; change of velocity divided by time.
- the slope of a velocity-time graph represents acceleration.
- the area under a velocity-time graph represents displacement (vector quantity).
the slope of a position-time graph represents velocity (speed).
motion that occurs in straight line
equation for constant acceleration
equation for when acceleration is constant and we do not have final velocity
equation used when acceleration is constant and you do not have time
summary of three equations
no displacement :
no final velocity :
- no time :
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