Download e-book for kindle: Force and motion by William C Robertson; Brian Diskin

By William C Robertson; Brian Diskin

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Heck, I don’t really know why inanimate objects push back—they just do. More things to do before you read more science stuff Find a place outside where you can walk and run, preferably alone because you’re about to look foolish. First just walk normally and pay attention to what your body is doing. Pay special attention to how you go about starting from a standstill. Now run and do the same thing. What do you do to begin running from a standstill? Now answer a question. In going from a standstill to walking, or from a standstill to running, you’re accelerating, right?

In what follows we’ll concentrate on the Moon and the Earth, but just so you know, the Sun also affects tides. You know that everything exerts a gravitational force on everything else, so it shouldn’t surprise you that the Moon pulls on the Earth and everything on it. 8 Let’s focus on the Earth, the ocean water closest to the Moon, and the ocean water farthest from the Moon. Gravitational forces get weaker the farther apart the objects. So the Moon exerts forces on things as follows: Gravitational force of the Moon acting on the ocean water closest to the Moono strongest force Gravitational force of the Moon acting on the Eartho medium force Gravitational force of the Moon acting on the ocean water farthest from the Moono weakest force Let’s see—three forces of different strengths—acting on three things that were together—reminds me of—hey, rubber bands!

Of course, those bathroom scales that measure your weight in pounds (an appropriate unit for measuring weight) and also give a readout in kilograms (a unit of mass, not weight) don’t help any. Suffice to say that if you don’t understand Newton’s second law, you’ll have a difficult time understanding the difference between mass and weight. If you do understand Newton’s second law, then you’re in business. Weight is a force, and thus belongs on the F side of the equation. Mass is what goes in for the m on the right side of the equation.

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