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Level 23

Linear Kinematics in 1D


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kinematics
branch of mechanics that explains the "what" and "how" of motion
body
The object of analysis; it could be a whole person, or part of a person, or an inanimate object.
system
A collection of components organized to accomplish a specific function or set of functions.
point
A way of representing a body that has no dimensions.
frame of reference
assists one in physics in which one chooses a place (point) a measure it against changes in position.
Origin
Center of a coordinate system is
direction
A point toward something, determined by its orientation and sense.
axes
A straight line running through the origin specifying a direction from the origin.
orientation
A particular reference line (horizontal, vertical, north, south, east, or west).
sense
Specified by two points. Going from point A to point B is one sense, and from B to A is the opposite sense.
Position
Is the distance and direction away from a reference point
scalar
a physical quantity that has magnitude but no direction
vector
a displacement distinguished by magnitude and direction but not by location.
displacement
A change in position (delta p).
Distance
a path taken and always a positive number
abscissa
The horizontal axis on a two-dimensional graph; the x-axis.
ordinate
The vertical axis on a two-dimensional graph; the y-axis.
rate
How quickly a value is increasing or decreasing with time.
Speed
Units: cm/s, m/s, mi/hr, km/s ...
Velocity
a speed in a particular direction.
slope
On a X vs. t graph, the velocity is represented by the_
average
A number representing the value of a quantity if that quantity did not change (was constant) throughout the period of interest.
Instantaneous
Speed given at any point of time
acceleration
(physics) a rate of change of velocity
relative velocity
How fast one body is moving in relation to another body; vb-a (velocity of b relative to a) = vb- va
net
The total value after summing all the individual values.
absolute
The magnitude of the value regardless of the sign.
projectile
An object in the air that is only subject to the force of gravity and wind resistance after it leaves the ground.
gait
Locomotion over land.
step
The period from the initial contact of the one foot to the initial contact of the other foot.
cadence
The number of steps taken in a given period of time (step rate).
stride
The period from initial contact of one foot to the next initial contact of that same foot.
range of motion
The amount of movement available at a joint in a given direction.
balance
The ability to control the body over its base of support.
strength
The ability to produce force.
Power
(physics) the rate of doing work