Transcript Forces! - Ottawa Hills Local School District

Forces!
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By: Matt Abendroth, Nick Hauck,
Austin Stevens, Evan Williams
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
•
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Mass is measured by using a balance comparing a known
amount of matter
• Weight is measured in scale. Ex. If you way 100 pounds that’s
your weight
• The mass of an object doesn’t change when an objects location
changes
• Weight, on the other hand does change with location.
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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Newton’s 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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Newton’s 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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Newton’s Third Law
Action/Reaction
• For every action there is an equal and
opposite reaction.
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