Chapter 2: Motion along a Straight Line

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Chapter 2 Motion along a Straight Line
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Introduction

• Motion along a straight line
• Motion
• Position and Displacement
• Average velocity and average speed
• Instantaneous velocity and speed
• Acceleration
• Constant acceleration A special case
• Free fall acceleration

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Motion Along a Straight Line

• Everything moves!
• Classification and comparison of motion ?
  kinematics
• Simplification
• Motion along straight line
• Forces cause motion
• Moving object is a particle or moves like a
  particle

Displacement
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Velocity

• Average velocity
  
• Average speed
• Instantaneous velocity

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Acceleration

• Average acceleration
• Instantaneous acceleration
• Constant acceleration

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Sample Problem II2
An elevator is initially stationary, then moves
upward (which we take the positive direction of
x), and then stops. Plot v as a function of time.

1. x(t) curve for an upward moving elevator cab
2. v(t) curve for the cab. Note v
   dx/dt!
3. a(t) curve for the cab. Note a
   dv/dt!

http//webphysics.ph.msstate.edu/
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Another Look at Constant Acceleration

• Integration of acceleration
• Indefinite integral or antiderivative
• Constant of integration

You will learn about this in integral calculus!
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Free-Fall

• vv0-gt
• h-h0v0t-gt2/2