Forces!

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Forces!

• By Matt Abendroth, Nick Hauck, Austin Stevens,
  Evan Williams

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Applied Forces

• A force that is applied by a person or an
  object. Ex. When a student pushes a desk across a
  room
• The force applied is the force exerted on the
  object or in this case the desk.

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Noncontact/ Gravity Forces

• Any force applied to an object by another body
  that is not in direct contact with it.
• The most common example of a noncontact force is
  gravity
• The units used for this force is jewels
• Gravity is the force of attraction by which
  terrestrial bodies tend to fall toward the center
  of the earth.
• Gravity keeps all the mass on the earth.

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Centripetal Forces

• A force that acts on a body moving in a circular
  path and is directed toward the center around
  which the body is moving
• The formula for centripetal force is ac v2/r

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Weight vs. Mass

• Mass is the measurement of the amount of matter
  something contains
• Weight is the measurement of the pull of gravity
  on an object
• Mass is measured by using a balance comparing a
  known amount of matter
• Weight is measured in scale. Ex. If you way 100
  pounds thats your weight
• The mass of an object doesnt change when an
  objects location changes
• Weight, on the other hand does change with
  location.

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Balanced and Unbalanced

• Balanced forces does not cause a change in motion
• An example of a balance force is when you have a
  arm wrestle with someone that is strong as you
  are and you guys are pushing as hard as you can
  and your arms stay in the same place.
• Unbalanced force is always cause a change in
  motion
• Unbalanced forces can cause the opposing forces
  to slow down because of the resistance or other
  force acting against it
• An example of an unbalanced force is when you
  kick a soccer ball your leg has more force than
  the soccer ball.

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Newtons First Law

• Inertia
• An object at rest stays at rest and an object in
  motion stays in motion with the same speed and
  direction unless acted on by an outside,
  unbalanced force.

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Newtons Second Law

• Acceleration
• The change in velocity with which an object moves
  is directly proportional to the magnitude of the
  force applied to the object and inversely
  proportional to the mass of the object.

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Newtons Third Law

• Action/Reaction
• For every action there is an equal and opposite
  reaction.

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