PHY 2020 Chapter Notes - Chapter 9: Tide, Gravitational Constant, Weightlessness
Document Summary
A force of gravity might account for the motions of the planet. Newton realized that the moon falls in the sense that it falls away from the straight line it would follow if there were no forces acting on it. Figure 9. 2: the tangential velocity of the moon about earth allows it to fall around earth rather than directly into it. If both masses are doubled? (3) gravitational force acts on all rather than straight into it. )f the moon"s tangential velocity were zero, how bodies in proportion to their masses. Why, then, doesn"t a heavy body fall have the same ratio of weight to mass. Newton"s second law reminds: (1) the moon would fall straight down and crash into earth, (2) when one mass is doubled, the force between it and the other mass doubles. If both masses double, the force is 4 times as great: (3) the answer goes back to chapter 4.
