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Gravity, Friction and Force

Study Slideshow

Two factors effecting the magnitude of the force of gravity between 2 objects are...

Mass and distance

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What is the SI unit used to measure weight? (Remember the definition of weight!)

Newton

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What is the force acting between any two objects in the known universe all the time?

Gravitational force

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The measure of how much matter is in an object.

Mass

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The law of universal gravitation is credited to whom?

Newton

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Oil between machine parts would be an example of which type of friction?

Fluid friction

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It is a force that acts in an opposite direction of movement.

Friction

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A type of friction that occurs when air pushes against a moving object causing it to negatively accelerate.

Air resistance

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Which type of friction occurs when an object moves through a liquid or gas?

Fluid friction

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What the of friction occur in this picture?

Rolling Friction

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Sally experiences -

Sliding friction

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Swimming fishes experience -

Fluid friction

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When most objects with smooth surfaces rub, there is less friction.

True

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What does friction produced? (Form of energy)

Heat

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Two ways how friction increases

Rougher surfaces and weight increase

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Methods how to reduce friction

Make the surface smooth and rolling friction

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