# physics

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what is the equal and opposite force the force of friction

like if a block is at rest on a table static friction is stil exerted by the table onto the block keeping it from moving

what is the equal and opposite force of this force?

• physics -

Is the table tilted? then gravity is the other force. Friction force only exists if there is a force trying to move an object.

• physics -

so there is no static friction when a block is just sitting there and not moving with no applied force?

• physics -

no, of course not. Don't get into the question if no one is in the forest to hear the tree fall, does it make a sound.

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