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Published byEleanore Small Modified over 9 years ago
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Chapter 13 Forces
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What is Force? A push or pull You are exerting a force right now (against the chair, or against the atmosphere) Other objects are also exerting a force on you!
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What are the Four Forces? Electromagnetic Strong Weak Gravity
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A force: Gives energy to an object Causes objects to: 1.start moving 2.stop moving 3.change direction 4.change shape
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Two forces: Can be exerted in the same direction (add together) Can be exerted in opposite directions (subtract them)
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Net Force:
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Balanced vs. Unbalanced: Balanced = forces in opposite directions that are equal Unbalanced = total force is in the same direction - changes the motion of an object
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Balanced
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Unbalanced
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Friction: A force that opposes motion Will cause an object to slow down & finally stop When two surfaces touch each other, there will always be some friction because the surface face is not completely smooth
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Friction: The amount of friction between two surfaces depends on how hard the surfaces are pushed together & the type of material of the two objects A heavy object will force the two surfaces together more than a lighter object
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Friction: To move an object, the force you exert on an object in one direction must be greater than the force of friction on that object in the opposite direction
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Types of Friction: 1.Sliding – solid objects slide over one another 2.Rolling – an object uses wheels or ball bearing to roll over another object 3.Fluid – object moves across or through a fluid (all gases & liquids)
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What type of friction?
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Putting it all together:
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