Why Physics

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Why Physics?
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Football

• Keep yourself from being tackled.
• Increase your momentum by increasing your speed.

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Seat Belts

• At what speed are seat belts really necessary?
• Do air bags and seat belts protect you in the
  same manner?

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How to win at pool
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Newtons 1st Law Law of Inertia
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Newtons 2nd Law
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Newtons 3rd Law
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Force

• Mass x Acceleration
• Newton

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Work

• Force x Distance
• Joules

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Power

• Work / Time
• (Force x Distance) / Time
• Watts Joules/second

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Momentum

• Mass x Velocity
• Kg x m/s

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Acceleration

• (Final Velocity Initial Velocity) / Time
• Meters / second2

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Efficiency

• Work out / work in x 100

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Kinetic Energy

• Energy of motion
• KE ½ mv2
• Roller coasters have the most KE at the bottom of
  the hill

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Potential Energy

• Energy due to gravity and position.
• PE mgh
• An object has its greatest PE at its highest
  point.

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Wave Parts
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Frequency of a wave

• Number of wavelengths that pass a point in a
  given time. Measured in Hz
• Wavelengths/seconds
• f 1/T

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Period of a Wave

• Amount of time it takes one wave to pass by a
  certain point. Measured in s
• Total seconds / Total of Waves
• T 1/f

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Wave Behaviors

• Interference waves can either add together or
  cancel each other out.
• Reflection waves bounce back off of barrier
• Refraction bending of waves as they pass from
  one medium to another
• Polarization wave vibrations that move back and
  forth in one place
• Resonance natural frequencies at which it is
  most likely to vibrate

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Three Types of Heat Transfer

• Convection transfer of heat by fluid movement.
  Does not occur in solids.
• Conduction transfer by direct contact
• Radiation transfer by electro-magnetic waves.
  Only type that can travel through space.

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For further information or tutorials, please see
Mrs. Carver