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Physics 1 honors Chapter 6 – Newton’s Third law of motion

Sections 6.1 to 6.4. Physics 1 honors Chapter 6 – Newton’s Third law of motion . Forces and Interactions. Place your hand on a wall and lean against the wall. What force(s) are acting in this situation?. Forces and Interactions.

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Physics 1 honors Chapter 6 – Newton’s Third law of motion

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  1. Sections 6.1 to 6.4 Physics 1 honorsChapter 6 – Newton’s Third law of motion

  2. Forces and Interactions • Place your hand on a wall and lean against the wall. • What force(s) are acting in this situation?

  3. Forces and Interactions • Newton realized forces are part of a mutual action or interaction. • When you stand on the floor you exert a force downward, but the floor must also exert a force upward. • How can you be sure this is the case?

  4. Newton’s Third Law • Newton’s Third Law states: • Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object. • Forces • One force is the action force • The other force is the reaction force • Which is which is unimportant • The are part of a single interaction • Each force cannot exist without the other.

  5. Newton’s Third Law • Forces occur in pairs: • The floor and you foot when walking • The bus tires and the road on the way to school • Weight and buoyancy on a boat • Dress shoes and ice????????

  6. Identifying the Action and Reaction • Object A exerts a force on object B • Object B exerts a force on object A • What are these forces when an engine falls off a jetliner? • What if I drop a ball off the top of the school? • What about a jet flying?

  7. Action and Reaction on Different Masses • Does the jet engine fall to the earth or the earth fall to the jet engine? • Why? • Newton’s Second Law • a α net force • a α 1/mass

  8. Action and Reaction on Different Masses • So the earth is moving toward the jet engine, just like the jet engine is moving toward the earth. • However, although the forces are equal and opposite, because of the difference in mass, the earths movement is insignificant in comparison to the movement of the jet engine.

  9. Action and Reaction on Different Masses • On the first day of the bear hunt, what about the recoil of a rifle? • Bullet: F/m = a • Rifle: F/m = a

  10. Action and Reaction on Different Masses • What about the space shuttle? • What are the forces acting on the shuttle at launch? • What are the forces acting on the scuttle when firing its engine in space?

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