Which refers to the ratio of output force to input force of a machine?

mechanical advantage

average strength

total power

energy requirement

Mechanical advantage refers to the ratio of output force to input force of a machine.

Explanation:

The formula for mechanical advantage is MA= D/d where D denotes output force and on the other hand, d denotes input force. Mechanical advantage can be increased when the fulcrum moves very close towards the load and another way of increasing mechanical advantage is that when the effort moves away from the fulcrum. Through mechanical advantage we come to know how much force is exerted by a machine when force is applied on the machine.

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant.