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21 Cards in this Set
- Front
- Back
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Friction
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The force that two surfaces exert on
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Static Friction
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Friction that acts on objects that are not moving
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Sliding Friction
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When two solid surfaces slide over each other
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Rolling Friction
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When an object rolls across a surface
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Fluid Friction
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Occurs when a solid a solid object moves thru a fluid
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Gravity
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A force that pulls objects toward each other
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Mass
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Measure of the amount of matter in an object
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Weight
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Force of Gravity on a person
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Free Fall
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The only force acting on an object is gravity
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Air resistance
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objects falling are supposed to fall at the same rate
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Terminal Velocity
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The greatest velocity a falling object reaches
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Projectile
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An object that is thrown
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1A What are the four types of friction?
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Static, Sliding Rolling and Fluid Friction
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1B What factors affect the friction force between the two surfaces?
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How hard the forces push together and the types that are involved.
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1C What types of friction occur when you ride a bike through a puddle?
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Fluid friction and rolling friction
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2A What is the law of universal gravitation?
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Any two objects in the universe that attract each other.
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2B How do mass and distance affect the gravitational attraction between objects?
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Mass and distance
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2C How would your weight change on the surface of an Earth- sized planet whose mass was greater than Earth's? Why?
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It would get lighter cause there's lass gravity.
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3A Why does an object accelerate when it falls toward Earth's surface?
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Because the force pulls it in
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3B How does the mass of an object affect its acceleration during free fall?
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It makes it go faster
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3C. What force changes when a sky diver's parachute opens? What force stays the same?
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Air Resistance
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