Planet Earth

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# Planet Earth - PowerPoint PPT Presentation

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

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
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

Distance

source

1/r2

charge(q)

charge (q)

Electric force

F= kq1q2/r2

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

Distance

source

Scotch tape 10-13cm

many “charges”

many “charges”

Strong Force

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

ATTRACTIVE AND REPLUSLIVE

STABILITY OF ATOMIC NUCLEOUS

Distance

source

Scotch tape 10-16cm

many “charges”

many “charges”

Weak Force

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

Radio active decay - instability of matter

Gravity

E & M

Strong

Weak

Infinite

Infinite

Short 10-13 cm

Very short 10-16 cm

Range
Strong

E & M

Weak

Gravity

1

10-2

10-13

10-42

Strength
Strong

E & M

Weak

Gravity

Gluons

Photons

Weakons

Gravitons

Mediators

Exchange particles (1949) vs.

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