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神秘无形 「忽 然，从天上有响声下来，好像一阵大风吹过，充满了他们所坐的屋 子。」 使 徒行传 2 章 2 节 读经 :  使徒行传 2 章 1-11 节 全 年读经 : 箴 言 1-3 章

神秘无形 「忽 然，从天上有响声下来，好像一阵大风吹过，充满了他们所坐的屋 子。」 使 徒行传 2 章 2 节 读经 :  使徒行传 2 章 1-11 节 全 年读经 : 箴 言 1-3 章. 无 论在美国或世界各地，我们常经历到一些无形力量所造成的巨大影响。例如在 2011 年，美国许多城市都受到龙捲风的侵袭，邻里和商业区都面目全非。每逢颶风或颱风季节，我们都饱受惊吓和威胁，因时速超过 160 公里的狂风，能轻易摧毁我们所建设的一切 。 这 些都由一股看不见的力量所致。当然，从旗帜飘舞和尘土飞扬中，我们可以看见风的效果，但我们无法看见风本身。风以一种神祕而无形的方式在运行 。.

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神秘无形 「忽 然，从天上有响声下来，好像一阵大风吹过，充满了他们所坐的屋 子。」 使 徒行传 2 章 2 节 读经 :  使徒行传 2 章 1-11 节 全 年读经 : 箴 言 1-3 章

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  1. Newton’s 3rd Law and Law of Gravitation Physics

  2. Learning Target: You will apply Newton’s Second Law after drawing free body diagrams to determine the net force. • Bell Ringer: Why do people say, ‘ Its not the fall that kills a person jumping off a bridge”? • Agenda: Newton’s 3rd law – 3 slides/notes • Finish page 138 # 1-5 • Complete force packet

  3. Newton’s Third Law “For every action there is an EQUAL and OPPOSITE reaction. • This law focuses on action/reaction pairs (forces) • They NEVER cancel out • All you do is SWITCH the wording! • PERSON on WALL • WALL on PERSON

  4. N.T.L This figure shows the force during a collision between a truck and a train. You can clearly see the forces are EQUAL and OPPOSITE. To help you understand the law better, look at this situation from the point of view of Newton’s Second Law. There is a balance between the mass and acceleration. One object usually has a LARGE MASS and a SMALL ACCELERATION, while the other has a SMALL MASS (comparatively) and a LARGE ACCELERATION.

  5. N.T.L Examples Action: HAMMER HITS NAIL Reaction: NAIL HITS HAMMER Action: Earth pulls on YOU Reaction: YOU pull on the earth

  6. Newton’s Law of Gravitation What causes YOU to be pulled down? THE EARTH….or more specifically…the EARTH’S MASS. Anything that has MASS has a gravitational pull towards it. What the proportionality above is saying is that for there to be a FORCE DUE TO GRAVITY on something there must be at least 2 masses involved, where one is larger than the other.

  7. N.L.o.G. As you move AWAY from the earth, your DISTANCE increases and your FORCE DUE TO GRAVITY decrease. This is a special INVERSE relationship called an Inverse-Square. The “r” stands for SEPARATION DISTANCE and is the distance between the CENTERS OF MASS of the 2 objects. We us the symbol “r” as it symbolizes the radius. Gravitation is closely related to circular motion as you will discover later.

  8. N.L.o.G – Putting it all together

  9. Try this! Let’s set the 2 equations equal to each other since they BOTH represent your weight or force due to gravity SOLVE FOR g!

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