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# Science

### Friction and Gravity

the force of friction causes objects to... slow down
the force of gravity causes objects to... accelerate downward
friction the force that one surface exerts on another when 2 rub against each other
friction acts in an _____ direction to the object's direction of motion opposite
friction _____ motion opposes
the strength of friction depends on: 1. the type of suface2. how hard the surfaces push together
3 types of friction: 1. sliding friction2. rolling friction3. fluid friction
sliding friction 2 solid surfaces sliding across each other
rolling friction creates less friction than sliding, requires less force
fluid friction fluid keeps surfaces from making direct contact and thus reduces friction-least amount of friction
fluid- liquid or gas
what is used in machines to reduce friction oil
free fall when the only force acting on a falling object is gravity
an object in free fall ____ as it falls accelerates
in free fall, gravity is a _____ force unbalanced
the acceleration due to the force of gravity is _____ 9.8 m/s
all objects in free fall accelerate regardless of_________ mass
although your ____ would be the same on a different planet or moon, your ____ would be different mass, weight
the force of gravity on earth's moon is about _____ that on earth 1/6
gravity depends on: 1. mass2. distance
gravity the force that pulls objects towards earth
projectile an object that is thrown
air resistance a type of fluid friction
terminal velocity the greatest velocity of an object in free fall
weight the force of gravity on a person or object on the surface of the planet
gravity the force that pulls objects towards earth
projectile an object that is thrown
air resistance a type of fluid friction
terminal velocity the greatest velocity of an object in free fall
weight the force of gravity on a person or object on the surface of the planet
Created by: boogasdancer101