Linear Kinematics: Describing Objects in Linear Motion

1
Chapter 5

• Linear Kinematics Describing Objects in Linear
  Motion

2
Kinematics

• A branch of dynamics concerned with the
  description of motion.
• Then - What is motion? The action or process of a
  change in position. Must occur in SPACE and TIME.

3
Linear Motion

• Rectilinear Translation
• Curvilinear Translation

4
Angular Motion

• Rotary Motion When points on an object or a
  body rotate in circles or portions of circles
  about an axis.

5
Position

• Defined as LOCATION IN SPACE. Defined through
  spatial orientation x, y and z in this course.
  Do not worry about the coordinate system used in
  our text.

6
Distance

• A measure of the length of the path followed by
  the object whose motion is being described-from
  initial position to final position.

7
Displacement

• The straight line distance in a specific
  direction form initial position to final
  position. Vector Quantity It has magnitude and
  direction.
• dposition (final)-position (initial)
• May need to find resultant displacement between
  horizontal and vertical motion.

8
Speed/Velocity

• Not the same-Velocity is a vector quantity. It
  has magnitude and direction.
• Speed is the rate of motion-Velocity is the rate
  of motion in a specific direction.
• Average speed distance traveled/t

9
Instantaneous Speed

• The speed of an object at a specific instant of
  time. Speedometer Readings.

10
Velocity

• V displacement/time but includes direction

11
Acceleration

• When an object speeds up, slows down, starts,
  stops or changes direction, it is accelerating.
• Average acceleration velocity (final)-velocity
  (initial)/ time

12
Constant Velocity/Zero Acceleration

• Velocity is not changing therefore the system is
  not accelerating. Thus zero acceleration.
  Cruise control.