Friction and Gravity – Flashcards
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the original settlers of New Zealand, they came from Polynesia
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Maori
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the force of friction causes objects to...
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slow down
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the force of gravity causes objects to...
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accelerate downward
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friction
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the force that one surface exerts on another when 2 rub against each other
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friction acts in an _____ direction to the object's direction of motion
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opposite
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friction _____ motion
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opposes
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the strength of friction depends on:
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1. the type of suface2. how hard the surfaces push together
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3 types of friction:
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1. sliding friction2. rolling friction3. fluid friction
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sliding friction
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2 solid surfaces sliding across each other
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rolling friction
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creates less friction than sliding, requires less force
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fluid friction
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fluid keeps surfaces from making direct contact and thus reduces friction-least amount of friction
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fluid-
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liquid or gas
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what is used in machines to reduce friction
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oil
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free fall
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when the only force acting on a falling object is gravity
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an object in free fall ____ as it falls
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accelerates
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in free fall, gravity is a _____ force
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unbalanced
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the acceleration due to the force of gravity is _____
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9.8 m/s
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all objects in free fall accelerate regardless of_________
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mass
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although your ____ would be the same on a different planet or moon, your ____ would be different
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mass, weight
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the force of gravity on earth's moon is about _____ that on earth
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1/6
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gravity depends on:
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1. mass2. distance
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gravity
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the force that pulls objects towards earth
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projectile
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an object that is thrown
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air resistance
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a type of fluid friction
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terminal velocity
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the greatest velocity of an object in free fall
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weight
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the force of gravity on a person or object on the surface of the planet
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gravity
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the force that pulls objects towards earth
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projectile
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an object that is thrown
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air resistance
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a type of fluid friction
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terminal velocity
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the greatest velocity of an object in free fall
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weight
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the force of gravity on a person or object on the surface of the planet
