COURSE ID : MPKARA0001

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COURSE ID MPKARA0001

• MASTERINGPHYSICS
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• COURSE ID MPKARA0001

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Components Of Vectors A Ax Ay
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Magnitude of a vector
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• A subscript x or y indicates that the quantity
  is
• a component vector or component along the x
• or y axis.
• A magnitude is always positive.
• A component is positive if the corresponding
• component vector points in the positive
• direction of the axis, negative if the
  component
• vector points in the negative direction of the
• axis.

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Using Components To Add Vectors
Cx Ax Bx Cy Ay By
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Chapter 2 Motion Along A Straight Line
Motion is a continuous change of position The
simplest motion is along a straight line Motion
position, velocity acceleration
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A One-Dimensional Coordinate System
Define the coordinate system (choose which
direction the arrow points), origin of position,
origin of time
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One-Dimensional Coordinates
Distance total length of travel. SI unit meter,
m. Displacement change in position final
position initial position. Displacement ?x
xf xi SI unit meter, m.
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Vav,x (x2-x1)/(t2-t1) ?x/?t SI unit m/s
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Average Velocity on an x-Versus-t Graph
vav,x ?x/?t
The slope of a line connecting two points on an
x-versus-t plot is equal to the average velocity
during that time interval.
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Instantaneous Velocity vx lim (?x/?t) ?t
0 SI Unit m/s
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Average Acceleration
aav,x (v2x v1x) / (t2 - t1) ?vx / ?t SI
unit m/s2
Instantaneous Acceleration ax lim (?vx/?t)
?t 0 SI unit m/s2
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• Acceleration is a vector quantity.
• When the acceleration is in the same direction
  as
• the velocity, the speed of the object is
  increasing.
• When the acceleration and velocity point in
• opposite directions, the object is slowing
  down.

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Cars Accelerating or Decelerating
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v-Versus-t Plots with Constant Acceleration
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Constant-Acceleration Equations of Motion
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• Free fall is the motion of an object subject
  only
• to the influence of gravity.
• An object is in free fall as soon as it is
  released,
• whether it is dropped from rest, thrown
• downward, or thrown upward.
• The acceleration produced by gravity on the
• earths surface (sometimes called the
  gravitational
• strength) is denoted with the symbol g.
• g 9.81 m/s2

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Figure 2-17aFree Fall and Air Resistance
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Figure 2-17bFree Fall and Air Resistance
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Relative Velocity Along A Straight Line
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Homework

• Problems for Chapter 2
• 2, 20, 26, 34,39,59
• Recitation 30,37,45,54,74,76
• CQ 1,2,5,11