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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

Planet Earth

Force Laws in Nature - Dynamics

kinds - sources - strengths - ranges - mediators

review
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
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/r2

gravitational charge - mass (m)

gravitational charge - mass (m)

Gravity Force

F = Gm1m2/r2

ATTRACTIVE ONLY - LARGE SCALE STRUCTURE/

STABILITY OF THE UNIVERSE

electric force
Distance

source

receiver

1/r2

charge(q)

charge (q)

Electric force

F= kq1q2/r2

ATTRACTIVE AND REPULSIVE - STABILITY OF THE ATOM/MOLECULES/MATTER

strong force
Distance

source

receiver

Scotch tape 10-13cm

many “charges”

many “charges”

Strong Force

??????????????

ATTRACTIVE AND REPLUSLIVE

STABILITY OF ATOMIC NUCLEOUS

weak force
Distance

source

receiver

Scotch tape 10-16cm

many “charges”

many “charges”

Weak Force

????????????????

Radio active decay - instability of matter

range
Gravity

E & M

Strong

Weak

Infinite

Infinite

Short 10-13 cm

Very short 10-16 cm

Range
strength
Strong

E & M

Weak

Gravity

1

10-2

10-13

10-42

Strength
mediators
Strong

E & M

Weak

Gravity

Gluons

Photons

Weakons

Gravitons

Mediators

Exchange particles (1949) vs.

Action at a distance /field concept (19th century)