SFA Test Review

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• SFA Test Review

Physics I (Fall)
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• Safety

• Listen to ALL instructions by teacher.
• Check lab equipment, report problems
• Wear safety goggles when instructed.

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• Rules for calculating significant figures
• or
• Same to right as smallest to right of decimal
  in problem
• x or /
• Same as measurement with smallest of
  significant figures.

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Velocity in 1 Dimension

• Displacement is final initial position.
• Velocity displacement / time
• Slope of position-time graph is velocity.

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Instantaneous Velocity

• Velocity at on moment in time.
• Slope of the tangent line on a position time
  graph.

V large
V small
V 0
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Acceleration in 1 Dimension

• Acceleration is the change in velocity per unit
  time.
• Slope of velocity time graph is acceleration.

-a
velocity
time
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Projectiles

• Horizontal Motion
• X direction
• Not affected by gravity
• Zero acceleration
• Range affected by horizontal velocity and fall
  time.

• Vertical Motion
• Y direction
• Acceleration is constant. (a -9.81 m/s2)
• Acceleration is due to gravity
• Vertical displacement controls fall time.

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Parabolic Trajectory
Vy 0 at max. height But a -9.81 m/s2
Large x velocity large range
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Equilibrium Objects at rest or moving with
constant velocity.
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• Adding Vectors
• If two vectors are perpendicular, the resultant
  can be calculated using Pythagorean Theorem.
• Use Trigonometric Functions to find the Angle,
  ?.

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a2 b2 c2
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Newton's Laws

• 1st
• Inertia motion doesnt change
• 2nd
• Fnet ma
• 3rd
• Action-Reaction force pairs

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The Universal Law of Gravitation

• The more mass they have, the greater the force of
  attraction.  The closer they are, the greater the
  force of attraction. 

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(No Transcript)
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• Famous Scientist
• Galileo free fall
• Newton Laws of Motion
• Kepler - Laws of Planetary Motion
• Joule - Basis of the law of conservation of
  energy
• Watt Improvements of the Steam Engine (Power)

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• Momentum

• momentum conservation
• Spi Spf
• inelastic collisions
• Damage is done (work!)
• elastic collisions
• KE is conserved!
• Perfectly inelastic collisions
• Objects stick together.

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• Work, Power, and Energy

• conservation of energy SEi SEf
• kinetic energy KE ½mv2
• potential energy PEg mgh PEe ½ kx2
• work/energy theorem S W DKE

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Circular Motion

• Requires a centripetal force.
• Always points to center of circle.
• Provided by an everyday force.
• Gravity / weight
• Friction
• Normal force / Tension
• Tangential velocity is perpendicular to
  centripetal acceleration.