LINEAR KINEMATICS QUANTITIES
KINEMATICS
DISTANCE AND DISPLACEMENT
linear kinematics describes the appearance of motion, is distinguished from kinetics, the forces associated with motion.
involves the shape, form, pattern, and sequencing of linear movement through time, without particular reference to the forces that cause or result from the motion.
units of lengths
SI unit: meter (m)
the form, pattern or sequencing of movement with respect to time
1 km= 1000m
1 mm= 1/1000m
1 cm= 1/100m
distance and displacement are assessed differently
distance is measured along the path of motion
displacement is measured in a straight line from the starting point to the ending point
0 displacement happens when the person moved from point A to point B and back to point A
SPEED AND LINEAR VELOCITY
distance is scalar quantity
vector is vector quantity
quantities that are parallel to distance and displacement
LINEAR VELOCITY
rate of change in location
SPEED
scalar quatity
defined as the distance covered divided by the time taken to cover it:
speed = length (or distance)change in time
Velocity (v) is the change in position, or displacement, that occurs during a given period of time
usually divide by time
AVERAGE AND INSTANTANEOUS QUANTITIES
happens instantly, at a period of time
the moment the athlete release, it will affect the distance travel
It is sometimes sufficient to quantify the average speed or velocity of the entire performance
AVERAGE VELOCITY
final displacement divide by total time
AVERAGE ACCELERATION
the difference in the final and initial velocities divided by the entire time interval
INSTANTANEOUS QUANTITIES
can be approximated by dividing differences in velocities over an extremely small time interval
KINEMATICS OF PROJECTILE MOTION