Static friction is ____ than sliding friction. Fluid friction affects objects moving in air or ____. Friction always acts in the ____ direction of the applied force. Oil, grease and wax are examples of ____. If applied force is greater than sliding friction, then the object will remain at ____. If static friction is greater than the applied force, the object will ____. Friction depends on the roughness or ____ of the surfaces in contact.

Friction

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