What's the difference between the bulk properties of a material and the surface properties?

What is the correct term for living the most sustainable life you can within your current circumstances?

All forces cause motion? true or false

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the independent variable in galileo's experiment? a. the speed of the ball b. the slope of the plane c. whether the ball moved d. what the ball was made of