Science quizllet – Flashcards
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Force
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A push or a pull effect
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Balanced Force
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Equal forces acting on an object in opposite directions
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Unbalanced Force
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Forces that produce a nonzero net force, which changes an objects motion.
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Unbalanced Force
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Forces that produce a nonzero net force, which changes an objects motion.
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Static Friction
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Friction that acts on objects that are not moving
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Kinetic Friction
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Friction that opposes motion once the motion has already started.
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Sliding Friction
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Friction that occurs when one solid surface slides over another.
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Rolling Friction
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Friction that occurs when an object rolls over a surface
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Fluid Friction
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Friction that occurs as an object moves through a fluid.
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Air Resistance
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A contact force that opposes the motion of objects moving in the air.
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Streamlining
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The science of shaping objects so they allow the easy flow of fluids around them to reduce drag
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Lubricant
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A fluid used to reduce friction by creating a thin layer between microscopic "hills and valleys" of a surface.
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Give four examples of lubricants.
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oil,soap,dish soap,and grease
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Name three ways to reduce friction
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Lubricant,
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Give two positives of friction.
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It can slow you down and it lets u speed up.
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Give two negatives of friction
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It can slow u down and it will create heat
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Hydroplaning
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A skimming effect caused by tires losing contact with a surface covered by water. It occurs when several factors combine to exert a lifting force under the tire. These factors include depth of the water, speed of the vehicle, and depth of the tire tread.
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Newtons 2nd Law of Motion
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F = M X A; If an object is acted on by a net force, the change in velocity will be in the direction of the force.
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newton
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A unit of measure that equals the force required to accelerate 1 kilogram of mass at 1 meter per second per second
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Law of Universal Gravitation
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Every object in the universe attracts every other object
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What are the two factors that determine the force of gravity between two objects
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Matter and Size
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Free Fall
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The motion of a falling object when the only force acting on it is gravity
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Terminal Velocity
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The constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite in direction to the force of gravity
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Name the two components of Projectile Motion
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Distance and speed
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Projectile Motion
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The curved path an object follows when thrown or propelled near the surface of the Earth.
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Apparent Weightlessness
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when it seems like something is weightless, but they arent, it is just that the object and the vehicle in which they are traveling are falling toward earth with the same acceleration
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Orbit, or orbiting
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Going around a object that has a gravitational pull greater that yours.
