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

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Presentation transcript:

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 There seems to be a myriad of forces we deal with each day - they all can be related to just 4!

Force Laws Gravity Electricity and Magnetism Strong Nuclear Weak Nuclear

Gravity Force Distance behavior source of the force –cause? receiver - what can feel the force 1/r 2 gravitational charge - mass (m) F = Gm 1 m 2 /r 2 ATTRACTIVE ONLY - LARGE SCALE STRUCTURE/ STABILITY OF THE UNIVERSE

Electric force Distance source receiver 1/r 2 charge(q) F= kq 1 q 2 /r 2 ATTRACTIVE AND REPULSIVE - STABILITY OF THE ATOM/MOLECULES/MATTER

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

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

Range Gravity E & M Strong Weak Infinite Short cm Very short cm

Strength Strong E & M Weak Gravity

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