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# '17 1D motion review

### Review of 1D motion and intro to forces

Distance divided by time speed
Change in position relative to the frame of reference motion
Starting point used to measure motion (system for specifying an objects location) Frame of Reference
Quantity that has magnitude only Scalar Quantity
Quantity that has both magnitude and direction Vector Quantity
Change in velocity divided by time Acceleration
Velocity if returning back to starting position 0 m/s
acts on an object to change its motion or state of rest force
Shortest distance between 2 points during motion Displacement
Displacement divided by time Velocity
the complete/total path of motion made by an object distance
2 ways to have zero acceleration at rest or constant velocity
ways to accelerate speed up, slow down, change direction
2 ways to have positive acceleration speed up in (+) direction , slow down in (-) direction
2 ways to have negative acceleration slow down in (+) direction , speed up in (-) direction
slope on a position vs. time graph speed
on a position vs. time graph, this shows object is moving in positive direction positive slope
on a position vs. time graph, this show object is at rest line is straight (zero slope)
on a position vs. time graph, this shows object is moving in negative direction negative slope
use this to find the magnitude of displacement of 90 degree motion (right angle) Pythagorean Theorem
on a velocity vs. time graph, this shows object is speeding up line goes away from x-axis
force that always opposes motion friction
slope on a velocity vs. time graph acceleration
on a velocity vs. time graph, this shows object is moving in positive direction line is in "top" quadrant
on a velocity vs. time graph, this shows object is moving in negative direction line is in "bottom" quadrant
on a velocity vs. time graph, this shows object is slowing down line goes toward x- axis
on a velocity vs. time graph, this shows object has constant velocity line is straight (zero slope) at a non-zero value
on a velocity vs. time graph, this shows object is at rest line is straight (zero slope) at zero only
object traveling in a circle has this acceleration centripetal
frictional force that acts on moving objects kinetic
frictional force that acts on stationary objects static
this is used to find the degrees of direction of 90 degree motion (right angle) tan^-1 (atan)