CH 3 - Linear Motion Flashcards
Motion of objects is always described as
Relative
Kinematics
Kinematics is only interested in the description of motion.
Kinematics involves at least three concepts:
Displacement
Velocity
Acceleration
Displacement
A change in position. The displacement of an object is not the same as the distance it travels.
Displacements magnitude
is the shortest distance between its starting and ending position.
Displacements direction
direction is could be positive or negative.
Speed
Defined as the distance covered per amount of travel time.
Average Speed
The entire distance covered divided by the total travel time
Instantaneous Speed
The speed at any instant.
Velocity
the instantaneous speed of the object and what direction the object is moving
Constant speed
steady speed, neither speeding up nor slowing down.
Constant velocity
uniform speed and constant direction (straight-line path).
Acceleration
the rate at which velocity changes over time.
Acceleration involves
change in speed, or change in direction, or
changes in both speed AND direction.
Free Fall
falling under the influence of the force of gravity only – neglecting air resistance.
