Look at the simple machine shown below and determine the mechanical advantage. A. 1.4
B. 0.2
C. 3.0
D. 4.9

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

If two students are running down the hall toward each other, trying to get to class, and they have the same mass and acceleration, what will happen when they collide? will their forces cancel out or will each one experience a reaction?

Most short-period comets do not have randomly oriented orbits because