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Planet Earth

Planet Earth. Force Laws in Nature - Dynamics. kinds - sources - strengths - ranges - mediators. Review. Newton’s Laws Law of Inertia - definition of mass F = ma mutual interaction These give the existence and strength of all forces

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Planet Earth

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  1. Planet Earth Force Laws in Nature - Dynamics kinds - sources - strengths - ranges - mediators

  2. Review • Newton’s Laws • Law of Inertia - definition of mass • F = ma • mutual interaction • These give the existence and strength of all forces • There seems to be a myriad of forces we deal with each day - they all can be related to just 4!

  3. Force Laws • Gravity • Electricity and Magnetism • Strong Nuclear • Weak Nuclear

  4. Distance behavior source of the force cause? receiver - what can feel the force 1/r2 gravitational charge - mass (m) gravitational charge - mass (m) Gravity Force F = Gm1m2/r2 ATTRACTIVE ONLY - LARGE SCALE STRUCTURE/ STABILITY OF THE UNIVERSE

  5. Distance source receiver 1/r2 charge(q) charge (q) Electric force F= kq1q2/r2 ATTRACTIVE AND REPULSIVE - STABILITY OF THE ATOM/MOLECULES/MATTER

  6. Distance source receiver Scotch tape 10-13cm many “charges” many “charges” Strong Force ?????????????? ATTRACTIVE AND REPLUSLIVE STABILITY OF ATOMIC NUCLEOUS

  7. Distance source receiver Scotch tape 10-16cm many “charges” many “charges” Weak Force ???????????????? Radio active decay - instability of matter

  8. Gravity E & M Strong Weak Infinite Infinite Short 10-13 cm Very short 10-16 cm Range

  9. Strong E & M Weak Gravity 1 10-2 10-13 10-42 Strength

  10. Strong E & M Weak Gravity Gluons Photons Weakons Gravitons Mediators Exchange particles (1949) vs. Action at a distance /field concept (19th century)

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