PHYSICS WORK

1. A woman lifts her 100-newton child up one meter and carries her for a distance of 50 meters to the  child’s bedroom. How much work does the woman do?

2. How much work does a mother do if she lifts each of her twin babies upward 1 meter? Each baby weighs 90 newtons.

3.You pull your sled through the snow a distance of 500 meters with a horizontal force of 200 newtons. How much work did you do?

 4.Because the snow suddenly gets too slushy, you decide to carry your 100-newton sled the rest of the way home. How much work do you do when you pick up the sled, lifting it 0.5 meter upward? How much work do you do to carry the sled if your house is 800 meters away?

5. An ant sits on the back of a mouse. The mouse carries the ant across the floor for a distance of 10 meters.Was there work done by the mouse? Explain.

6. You decide to add up all the work you did yesterday. If you accomplished 10,000 newton·meters of work yesterday, how much work did you do in units of joules?

7. You did 150 joules of work lifting a 120-newton backpack.

a. How high did you lift the backpack?

b. How much did the backpack weigh in pounds? (Hint: There are 4.448 newtons in one pound.)

8. A crane does 62,500 joules of work to lift a boulder a distance of 25.0 meters. How much did the boulder weigh? (Hint: The weight of an object is considered to be a force in units of newtons.)

9. A bulldozer does 30,000 joules of work to push another boulder a distance of 20 meters. How much force is

applied to push the boulder?