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

a machine can never be 100% efficient because some work is always lost due to which factor?\nfriction\ngravity\nstatic\ninput force

a machine can never be 100% efficient because some work is always lost due to which factor?\nfriction\ngravity\nstatic\ninput force

Answer

Answer:

A. friction

Brief Explanations:

Friction causes energy loss in machines. It converts some input work into heat, reducing efficiency. Gravity and static are not main factors for work loss in machines. Input force is what we apply, not a loss - causing factor. So, friction is the reason a machine can't be 100% efficient.