units
an agreed upon measurement by which we recon a physical quantity or dimension
systems of units
english- miles, inches, pounds metrics SI- meters, kilograms, seconds
fundamental units
meters, kilograms, seconds
derived units
speed, acceleration, force
scalar quantities
-physical measurement that has some magnitude -distance, speed
vector quantities
-physical measurement that have a magnitude and direction -position, displacement, velocity, force
distance
total length or space traversed during some motion (m)
average speed
#NAME?
instantaneous speed
0
kinematics 1-D
is the study of motion without regards to the cause of motion. one dimensional is only considering motion in a straight line
position
-indicates the location of an object with regards to a reference point - position can be thought of as a vector -units of m-during motion we can measure an objects change in position which is called displacement
displacement
-change in position -disp.=final position-initial position -change in x= xf- xi
velocity
-time rate of change in displacement both average and instantaneous speed v=change x/change t
acceleration
-time rate of change in velocity. can be average or instantaneous -constant acceleration motion is often considered for our work a= change v/ change t [m/s2] acceleration can occur from: speeding up, slowing down, and changing direction