Mahmood is lifting a bag of cement. He uses 5 N of force to lift the bag 20 meters. If Mahmood uses a machine to decrease the distance to 10 meters, he will ___.

decrease the amount of work done

increase the amount of work done

decrease the amount of force needed

increase the amount of force needed

Answer;

Decrease the amount of force needed

Explanation; A machine does not decrease the amount of work that is done. Instead, a machine changes the way in which work is done. Recall that work is the use of force to move an object. Machines are used to make work easier by reducing the force needed. They do not decrease the amount of work. Machines make work easier to do by decreasing the force required by increasing the distance over which the work is done.

Decrease