Displacement

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Displacement
Velocity
Acceleration
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• To understand the word around us, we must
  understand as much about motion as possible. The
  study of motion is fundamental to the principles
  of physics, and it is applied to a wide range of
  topic, such as automotive engineering, rocket
  launches, and improvement in athletic
  performances (kinesiology)

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• To stay within the scope of this course, we will
  study the motion of an object in a straight line.

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A construction worker drops a hammer from a
height of 90m towards the ground
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• The height of the hammer, as a function of time,
  is described by s(t) 90 4.9t2

• Determine the first derivative s(t), what does
  it mean?
• Determine the second derivative s(t), what
  does it mean?
• Include sketches(use sketchpad)

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• 3. When will the hammer hit the ground?
• 4. Determine the impact velocity
• of the hammer?

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Velocity and Acceleration have directions.

• If the acceleration and the velocity of an object
  have the same sign at a particular time, then the
  object is being pushed in the direction of the
  motion, and the object is speeding up.
• If the acceleration and the velocity of an object
  have opposite signs at a particular time, then
  the object is being pushed in the opposite
  direction of its motion, and the object is
  slowing down.

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Velocity and Acceleration have directions.

• An object is speeding up, at time t if
• v(t) X a(t) gt 0
• An object is slowing down, at time t if
• v(t) X a(t) lt 0

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• Yellow Harcourt
• Pg 185
• 1, 2, 3a,c,e,f try 5 8, 9, 10,11,12