An axe provides a mechanical advantage of 8. If a grade eight student can provide a force of 90N with a swing of an axe. What is the force the student can provide to the
wood with each swing?

Adding more pulleys to a system of pulleys needed to lift an object. a. increases the force b. decreases the force c. increases the amount of work d. decreases the amount of work

Which car has the most kinetic energy? a. a car of mass 1000 kg with a speed of 3 m/s b. a car of mass 2000 kg with speed 7 m/s c. a car of mass 1000 kg with speed 7 m/s d. a car of mass 2000 kg with speed 3 m/s

How does the formation of intrusive and extrusive igneous rocks differ?