What holds the atoms together? Need to start considering Forces Electricity tends to split atom apart (like charges repel; unlike charges attract) So what.

Slides:

Advertisements

Similar presentations

Newton’s Laws. Newton’s First Law of Motion “Every object continues in its state of rest, or of uniform motion in a straight line, unless it is compelled.

Advertisements

Universal Forces Chapter Electromagnetic Forces Electric Forces Magnetic Forces They are the only forces that can both attract and repel.

The Atom - Continued. What are quarks? protons & neutrons can be separated into smaller particles called quarks these are a different kind of particle.

Unit 2 - Forces. Types of Forces In this chapter we will explore; Different types of forces and learn about how they affect the velocity and acceleration.

Fundamental Forces of the Universe

Electricity&… Magnetism Review of Coulomb`s Force,Magnetic Fields and Magnetic Force Lecture 22 Monday: 5 April 2004.

Introduction and Forces in Nature

Electromagnetic Waves. Electromagnetic waves are simply oscillating electric and magnetic fields where the they move at right angles to each other and.

Physics I Honors 1 Specific Forces Fundamental Forces Universal Gravitation.

Chapter 4 The Laws of Motion. Classical Mechanics Describes the relationship between the motion of objects in our everyday world and the forces acting.

Newton’s 1 st Law. Newton’s First Law of Motion Objects in motion will to stay in motion, objects at rest will stay at rest unless they are acted upon.

Newton’s Law of Universal Gravitation

C H A P T E R 4 Forces and Newton's Laws of Motion

Radioactivity and Nuclear Reactions. How Did It All Happen? Radioactivity 4.16.

Ch 16.1 Electric Charge and Static Electricity

1. Electrostatics Electric Force. First review the gravitational force… Any two masses are attracted by equal and opposite gravitational forces: m1m1.

Chapter #4 - Dynamics Mr. Jean

What are the basic building blocks of matter? Empedocles – Earth, Air, Water, Fire Democritus – “Nothing exists except atoms and space; everything else.

Electricity and Magnetism Explore the second of the four fundamental forces in nature –Gravity –Electricity and Magnetism –Weak Nuclear Force –Strong Force.

I. Characteristics of Magnets

Radioactivity and the Four Forces Chapter 9, Section 1, Page 258 – 262 Monroe 12/01/08.

The Laws of Motion & Force!

Forces in the Universe What is a force? What is a force? A push or a pull.

Section 4 Universal Forces.

ATOMIC STRUCTURE SUBATOMIC PARTICLES. WHATS IN AN ATOM? THREE MAIN PARTICLES THREE MAIN PARTICLES PROTONS PROTONS NEUTRONS NEUTRONS ELECTRONS ELECTRONS.

Unit 2 - Forces. In this unit, you will be able to: 1.Define and describe concepts related to force – i.e. types of forces 2.State and apply Newton’s.

1.Electricity 2.Magnetism 3.Electromagnetism CLASSICAL PHYSICS Electricity & magnetism.

C H A P T E R 4 Forces and Newton's Laws of Motion

What makes up the nucleus? Nucleus is positively charged Different atoms have same electrical properties but different masses Isotopes – same atomic number,

FORCES Chapter 5. Mechanics The study of Motion Isaac Newton, 1600’s The father of mechanics.

Universal Forces 12.4 Assessment Qs 1-4.

Types of Forces Observations of planets, stars, and galaxies strongly suggest four universal forces exist throughout the universe. electromagnetic strong.

Electromagnetism-1 (Electric Charge and Coulomb’s Law) by Dr. Adam A. Bahishti.

An artist’s depiction of a planet’s surface shows a world very different from Earth. Certain universal forces are present.

Universal Forces Chapter Universal Forces Observations of planets, stars, and galaxies strongly suggest four universal forces exist throughout the.

Chapter 5 IONS/IONIC COMPOUNDS AND NEWTON’S LAWS (FORCES)

Chapter 4 Forces in One Dimension. Classical Mechanics Describes the relationship between the motion of objects in our everyday world and the forces acting.

Modern Physics Four Forces of nature. Scientists describe all of nature with only four forces. Gravitational force Weak Nuclear force Electromagnetic.

Modern Physics Four Forces of nature. Scientists describe all of nature with only four forces. Gravitational force Weak Nuclear force Electromagnetic.

Forces & Newton’s First Law

An artist’s depiction of a planet’s surface shows a world very different from Earth. Certain universal forces are present.

Electromagnetic Radiation

Magnetism & Electricity

Electromagnetism 1865: James Clerk Maxwell 1887: Heinrich Hertz

Chapter 9: Gravity Gravity is the force most familiar to us, and yet, is the least understood of all the fundamental forces of nature.

Universal Forces Chapter 12-4 pg

Fundamental Forces of the Universe

Four Fundamental Forces

Universal Forces.

Forces & Newton’s First Law

Star Forces: Question of the day!

Fundamental Forces of the Universe

Gravity The Forces in Creation.

Universal Forces 12.4 Notes.

An artist’s depiction of a planet’s surface shows a world very different from Earth. Certain universal forces are present.

Introduction to Forces

The Four Forces of Nature

Chapter 12.4 Notes Name: Observations of planets, stars, and galaxies strongly suggest four universal forces exist throughout.

An artist’s depiction of a planet’s surface shows a world very different from Earth. Certain universal forces are present.

Physics I Gravity.

Chapter 12 Review Albert’s group.

Fundamental Forces.

Newton’s Law of Universal Gravitation

An artist’s depiction of a planet’s surface shows a world very different from Earth. Certain universal forces are present.

I. Characteristics of Magnets

Forces & Newton’s First Law

Universal Forces.

Momentum = the product of an object’s mass and it’s velocity

What Holds the Nucleus Together?

Presentation transcript:

What holds the atoms together? Need to start considering Forces Electricity tends to split atom apart (like charges repel; unlike charges attract) So what holds it together? Gravity?

The Force of Gravity Isaac Newton (among others) – Gravity is an Inverse Square Law: F grav = GM 1 M 2 / R 2 G is a constant that gets the units correct – the physics is in the product of the masses and the R-squared in the denominator.

The Electrical Force Henry Cavendish: Electricity is an Inverse Square Law: F el = kq 1 q 2 / R 2 k is a constant that gets the units correct – the physics is in the product of the charges and the R-squared in the denominator.

Okay, so the atom is solved! Electricity holds the electrons in orbit around the positively charged nucleus – yeah! Electricity also wants to push the positive charge in the nucleus apart, but... Gravity holds the nucleus together! Yeah! Umm... Hold on a minute (see the board...)

So gravity isn’t enough.. Let’s look at other forces that can attract and repel. Like magnetism... Magnetism is produced by electric currents.

Electricity and magnetism Okay, electricity produces magnetism... But Faraday showed that magnetism can also produce electricity! And... It was later shown that electricity can produce magnetism in more than one way, leading to...

Unification => Electromagnetism Electricity and magnetism are two aspects of the same fundamental interaction – Electromagnetism. James Clerk Maxwell (1865) showed that the two “fields” interact to form EM waves. Speed of those waves? 3 × 10 8 m/s! Speed of light!

Optics and EM Unification So Light is an EM wave. Many other EM waves (like microwaves) Electricity, Magnetism, and Optics are unified. But none of them is strong enough to keep the nucleus together.

So what DOES keep the nucleus together? “The Hand of God?” Well... The force is in the nucleus, so we’ll call it... “The strong nuclear force”. Better than the “Hand of God”??

So why “Strong”? Still need one more interaction Radioactivity The Weak Nuclear Force.