a machine can never be 100% efficient because some work is always lost due to which factor?\n○ friction\n○…

a machine can never be 100% efficient because some work is always lost due to which factor?\n○ friction\n○ gravity\n○ static\n○ input force

a machine can never be 100% efficient because some work is always lost due to which factor?\n○ friction\n○ gravity\n○ static\n○ input force

Answer

Brief Explanations:

Friction causes energy - loss in machines as it resists motion and converts mechanical energy into heat energy, reducing efficiency. Gravity is a force that acts on objects due to mass, static is a state, and input force is what starts machine operation, none of which directly cause work - loss like friction.

Answer:

A. friction