Describing Motion � Kinematics in One Dimension
Kinematics:
The mathematical description of motion without any reference to
the cause.The cause of this motion will be described in a
later tutorial.
Vector:
A quantity that has magnitude, size, and direction. Velocity and
displacement are examples.
Scalar:
A quantity that has only magnitude, or size.Speed, distance, and
time are examples.
Instantaneous velocity:
The speed of an object at any particular instant.
Average velocity: The total distance traveled divided by
the total time of travel.
Acceleration: The rate of change of velocity.
Acceleration describes how fast an objects speed is changing per
amount of time.
Kinematic Equations:
Formulas that relate the variables of motion.
v=d/t
a = Δv/Δt=(vf-vi)/t
d=vit+at2/2
vf2=vi2+2ad
acceleration due to gravity = -9.8 m/s2
Free Fall:
Motion where gravity is the only force acting
on an object.Gravity will accelerate an object at -9.8 meters per
second per second.
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