Question

Explain how the law of conservation of energy can be resolved with the fact that machines allow a large object (resistance) to be moved with very little force (effort). Pick the best answer.
since work equals force times distance, the distance over which the effort takes place increases since F = ma,
if the acceleration is increased, the force can be increased even though the mass stays small since Efficiency = ,
if the efficiency percentage is increased, the small mass can do more work since , if the t is increased,
the same amount of work can be done with a smaller mass

Answer 1

Answer:

since work equals force times distance, the distance over which the effort takes place increases since F = ma

Explanation:

Work is equal to force times distance.  Rather than use a large force over a short distance, machines allow us to use a small force over a large distance (for example, a lever).  The amount of work is the same either way.

Answer 2

Answer:

since work equals force times distance, the distance over which the effort takes place increases