Now that you've created a scale model of the solar system, describe the relative distances between the planets. What patterns, or similarities, do you notice? How do these distances affect the amount of time it takes each planet to orbit the Sun? ​

The answer is c) tons

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on