2. What is meant by the statement that the MA of a simple machine is 3

Explanation:

MA of a machine is its mechanical advantage.

 Mechanical advantage is the ability of a machine to multiply force so as to get a work done.

This is done by minimizing effort and maximizing the load or output. A MA of a simple machine with a value of 3 suggests that such a machine will multiply input force by a factor of 3. Therefore, such a machine will amplify the force input into the system.

Ithink they do have the same properties just in less quantities i think

If there was no gravity then their would be no downword force on the football to have it return the the grownd, and if there was no friction (mainly air friction) then there would be no opposing force the stop the ball from moving through the air allowing the ball to travle ∞.