What is friction???
What is gravity???
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Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact
Gravity, also called gravitation, in mechanics, the universal force of attraction acting between all matter. ... On Earth all bodies have a weight, or downward force of gravity, proportional to their mass, which Earth's mass exerts on them. Gravity is measured by the acceleration that it gives to freely falling objects.
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- Friction - Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other
- Gravity - An invisible force that pulls objects toward each other. Earth's gravity is what keeps you on the ground and what makes things fall.
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