NS3310 – Physical Science Studies

NS3310 – Physical Science StudiesNS3310 – Physical Science Studies

Classical Physics and Plate Tectonics

Rube Goldberg Machine CompetitionRube Goldberg Machine Competition

Physics QuestionsPhysics Questions What is mass?

What is force?

What is inertia?

How are they related?

What is momentum?

What are Newton’s three laws?

How do they account for the motions we observe in nature?

How do friction and gravity work?

Why does the moon orbit the earth, but a bullet shot into the air falls to the ground?

Newton’s 1st LawNewton’s 1st Law

Every Object (mass) retains its state of rest or its state of uniform straight-line motion (inertia) unless acted on by an unbalanced force.

Mass Corresponds to InertiaMass Corresponds to Inertia

Mass is matter occupying Space-time

Inertia is the tendency of mass to stay at rest or remain in motion unless acted on by an outside force

A force is a push or a pull

Space-TimeSpace-Time d = vt

d is distance

(displacement is different from distance)

v is velocity

t is time

Speed is change in distance over time (magnitude)

Velocity is speed plus direction (vector)

(scale is important)

Newton’s 2nd LawNewton’s 2nd Law The acceleration of an object is directly

proportional to the net force acting on it inversely to the mass of the object.

Net Forces can be balanced or unbalanced

F = maF = ma Force equals mass X acceleration

Acceleration is change in velocity over time

There are three ways to accelerate: – speed up– slow down – change direction

A motorist wishes to travel 40 kilometers at an average speed of 40 km/hr. During the first 20 km, an average speed of 40 km/hr is maintained. During the next 10 km, however, the motorist goofs off and averages only 20 km/hr. To drive the last 10 km and average 40 km/hr, the motorist must drive:

a) 60 km/hr c) 90 km/hr

b) 80 km/hr d) faster than light

Acceleration ProblemsAcceleration Problems Roller Coaster Physics

Where is the greatest thrill on a roller coaster?

Why?

Which Lane?Why is a race on a straight track faster than one the same distance on a curved track? Why is there an advantage to running in the outside lane?

Run or Walk in the Rain?Should you run or walk when crossing

a street in the rain without an umbrella?

MomentumMomentum

p = mvClowns on IceLife Preserver Problem

Momentum is ConservedCollisions– Elastic– Inelastic

Momentum ProblemsMomentum Problems Why are Boxing Gloves Safer than Bare Hands?

How Can Cats Survive Long Falls?

Bed of Nails, Anyone?

What should you do if you are trapped in a falling elevator?

ImpulseImpulse Impulse = Ft

Impulse = Dp (Impulse equals change in Momentum)

Why is it easier to accelerate a soccer ball than a bowling ball?

Can you push your van from the inside?

Why is it better to push your stalled van than to hit it?

Newton’s 3rd LawNewton’s 3rd Law Whenever two objects interact, the force exerted on one object is equal in strength and opposite in direction to the force exerted on the other object.

Rocket Science

Support Force is NOT Reaction Force

A Couple of Forces Worth Special AttentionA Couple of Forces Worth Special Attention Gravity

– Newton’s Gravity (G = m1 X m2 / d2)

Newton’s Apple

– Einstein’s Gravity (G = ma of space-time)

Friction(Friction is the earth’s reaction force to our pushing against it . Remember, we are accelerating toward the earth due to the earth’s gravity, we accelerate toward the earth since the earth’s mass is much greater than our own)

Inertia is independent of gravity(Weight is the Force of Gravity on Mass)Inertia is independent of gravity(Weight is the Force of Gravity on Mass)

FG = M1 X M2 / d2

Galileo

Center of gravity?

How does Newton’s gravity differ from Einstein’s gravity?

Projectile MotionProjectile Motion Projectile Motion is a balance between straight line motion and gravity

– Baseball Physics

– Ballistics

– The Monkey Problem

An Orbit is an example of projectile motion

– What would happen to the moon if the earth disappeared?

A zookeeper devises a rubber-band gun to shoot food to a monkey who is too shy to come down from the trees. If the monkey does not move, should the keeper aim above, at, or below the monkey?

If the monkey lets go of the branch at the instant the keeper shoots the food, should the keeper aim above, at, or below the monkey to get food to the monkey in mid-air?

Key ConceptsKey Concepts Newton’s 1st law is known as the law of inertia Mass is matter (and energy) occupying space-time (E=mc2) Inertia is the tendency of mass to stay at rest or remain in motion unless

acted on by an outside force Acceleration a is change in velocity with time A force is a push or a pull (Newton’s 2nd Law) F=ma (force = mass X acceleration) Momentum is mass X velocity Momentum is conserved For every action there is an equal and opposite reaction

(Newton’s 3rd Law) Reaction pairs are specific Gravity (G) = M1XM2 / d2

Projectile motion is the result of the balance between straight line motion and gravity

An orbit is an example of projectile motion

GeoblocksGeoblocks You will create the model of plate tectonics which will be used on your

practical exam.

Be sure to use the colors indicated for each layer.

Be sure to match the correct top to each block.

Be careful to distinguish sedimentary layers at the very top of some blocks from the igneous layers (some colors are the same, but the sedimentary layers are only at the very top of some blocks and on the tops)

If you have any questions, ask me

Questions Plate Tectonics AnswersQuestions Plate Tectonics Answers

What is the internal structure of the earth?

What is the earth’s crust and how did it form?

What is the difference between ocean crust and continental crust?

Why do mountain chains on different continents have similar rocks and fossils?

Why do the continents look like a puzzle?

How can continents move around?

Okay, so if the plates are moving around, what happens if they run in to each other?

Plate TectonicsPlate Tectonics The theory of plate tectonics is the unifying

theory of geology.

The earth is made of many layers: the solid inner core, liquid outer core, plastic mantle, and solid crust.

The earth’s crust is a thin solid layer of rock floating on the plastic mantle below it. The crust is broken up into many plates. Plates can have ocean crust, continental crust, or combinations of both.

Ocean crust is denser than continental crust, so it floats deeper in the mantle.

Plate TectonicsPlate Tectonics Where plates move apart as new crust

forms is called a spreading center or rift zone. This can occur in the oceans or on land.

When plates with ocean crust run into plates with continental crust they are subducted.

When two plates with continental crust collide, mountains form through orogeny.

When plates with a combination of ocean and continental crust collide they slide against each other along transform faults.

The Structure of the EarthThe Structure of the Earth

Inner Core

Outer Core

Mantle

Crust

Divergent Plate BoundariesDivergent Plate Boundaries

Sea-Floor Spreading Age of Ocean Floor Magnetic Anomalies

Example of Divergent Boundary – Mid-Atlantic Ridge

Convergent Plate BoundariesConvergent Plate Boundaries

Subduction Ocean trenches Volcanism Back-arc basins

Orogeny (examples: Himalaya and Appalachia Mountains

Transform BoundariesTransform Boundaries San Andreas Fault

Active and Passive Margins

Hot SpotsHot Spots

Oceanic Hot SpotsIsland Chains

Continental Hot Spots

Key ConceptsKey Concepts The theory of plate tectonics is the unifying theory of geology.

The earth is made of many layers: the solid inner core, liquid outer core, plastic mantle, and solid crust.

The earth’s crust is a thin solid layer of rock floating on the plastic mantle below it. The crust is broken up into many plates. Plates can have ocean crust, continental crust, or combinations of both.

Ocean crust is denser than continental crust, so it floats deeper in the mantle.

Where plates move apart as new crust forms is called a spreading center or rift zone. This can occur in the oceans or on land.

When plates with ocean crust run into plates with continental crust they are subducted. When two plates with continental crust collide, mountains form through orogeny. When plates with a combination of ocean and continental crust collide they slide against each other along transform faults.

Different types of volcanoes are produced at rift zones and behind subduction zones.

Hot spots in the mantle form island chains as ocean crust moves above them.

Egg DropEgg Drop 1. The device must be of original design.

2. It can constructed of any the materials placed on the front tables.

3. Upon the initial release of the device, it must be able to fit within a 10" X 10" X 10" cube. Once the device is released, it may take any shape or size.

4. There will be no physical contact with the device and the designer once the device has been released.

5. The design must allow for easy opening and inspection of the egg.

6. Repairs requiring additional materials will not be allowed once the competition has begun—accept for "re-closing" after each inspection.

7. "Free Fall" indicates the use of gravitational acceleration forces only, therefore no propulsion devices or air drag devices.

9. Be prepared to clean up your mess, if necessary.

10. The device will be dropped from the third, second, then first floor of the parking garage. Your package will be inspected to see that the egg has survived from each height.

11. Originality will be awarded

EnergyEnergy Energy is the capacity to do work!

Potential Energy = the potential to do work

Kinetic Energy = the energy of motion (momentum)

Forms of EnergyForms of Energy

Mechanical (mass)

Chemical (heat)

Radiant (light)

Electrical (electricity and magnetism)

Nuclear (atomic)

Energy ConversionEnergy Conversion Any form of energy can be converted to any other

form of energy

Energy is Conserved!

Entropy (DS = q/T, where T = temperature, so we’ll get back to

this later)

Sources of EnergySources of Energy Fossil Fuels

Biofuels

Hydrodynamic (water)

Aerodynamic (wind)

Geothermal

Solar

Hydrogen

Nuclear

An Interesting ProblemAn Interesting Problem The electricity consumption in the United States in the year 2001 was about 3600

billion kWh ("kilowatt-hour"), and in the whole world, 13,900 billion kWh (data from "International Energy Annual"; http://www.eia.doe.gov/emeu/iea/table62.html). A kWh is a measurement of the amount of energy supplied by 1 kW in one hour. For example, if a 100-W light bulb is on for 10 hours, the energy used is 1 kWh of energy.

If we were able to capture all solar radiation arriving on Earth (at the top of the atmosphere) and convert it to electricity with 100% efficiency, how long would we need to capture this energy to satisfy the electricity consumption for the whole year for the United States? The world? (Hint: calculate the cross-sectional area of Earth.)

Answer:Cross-sectional area of Earth facing the Sun at any given time = pRe

2 = 1.28 X 1014 m2 (where Re is the Earth’s radius)

The amount of energy received by the Earth in one second is

E =1370 J/s/m2 X 1.28 X 1014 m2 X 1 s = 1.75 X 1017 J

Length of time required to satisfy electricity consumption for one year:

tUSA = 1.30 X 1019J / 1.75 X 1017 J = 74 s (1 min 14 sec)tWorld = 5.00 X 1019 J / 1.75 X 1017 J = 286 s (4 min 46 sec)

Key ConceptsKey Concepts Energy is the capacity to do work

Potential Energy is energy of position relative to gravity

Kinetic Energy is the energy of motion

There are many forms of energy, but any one form can be converted to any other

Energy is released in collisions

Energy is always conserved

Earthquake TableEarthquake Table You must build a structure that will survive an earthquake. You will build your structure

from play dough and paper cards. You must build your structure with the following specifications:

1. Your building must be of original design.

2. It can constructed only out of the materials provided (you are on a budget).

3. The structure should be at least three stories tall, with a base of at least seven inches by seven inches.

The top floor must measure at least five inches by five inches.

4. The total height must be at least 12 inches.

5. There will be no physical contact with the structure by the designer once the earthquake table has been started.

Remember - Tectonic ForcesRemember - Tectonic Forces Tectonic forces include

Plate tectonics– Compressional forces– Tensional forces– Shearing forces

Volcanism

Orogeny (mountain building)

Faulting and Folding

And Intrusions of magma into the crust

Types of VolcanoesTypes of Volcanoes Quiet

Shield Volcanoes

Hot Spot Volcanoes

Fissure Volcanoes

Pillow Lava

Types of VolcanoesTypes of Volcanoes Explosive

Magma Chamber

Vent

Crater

Caldera

Pyroclastic flow

Cinder Cone

How Dangerous are Volcanoes?How Dangerous are Volcanoes?

Volcano Hazards

Historic Eruptions

Earth QuakesEarth Quakes Focus

Epicenter

Seismic Waves

Primary Waves

Secondary Waves

Moho (Mohorhovicic Discontinuity)

Type of FaultsType of Faults Normal Fault

Reverse Fault

Strike-Slip Fault

Horst and Graben

FoldingFolding Anticlines

Synclines

IntrusionsIntrusions

Batholiths

Laccoliths

Sills

Dikes

Key ConceptsKey Concepts Many forces change the earth’s surface

Tectonic forces change the earth from the inside out

A fault is a break in the earth’s crust

Tensional, Compressional and Shearing stress on a fault can cause folding of the crust and earthquakes

Seismic waves are created by the friction of movement along a fault

A volcano is a vent of molten rock to the earth’s surface

Intrusions are formed by magma which does not reach the earth’s surface

Cartoon Laws of PhysicsCartoon Laws of Physics

Cartoon Laws of Physics

Falling Hare

Looney Tunes

RememberRemember

F=ma

P=mv

Impulse=Ft (or DP)

WorkWork

W = Fd

Force is measured in Newtons (N), or Pounds (lb)

Distance is measured in meters (m), or feet (ft)

Work is measured in Joules (J, which = 1 Nm), or Foot-Pounds (ft-lbs)

HINT: Don’t forget the units! Without units, you don’t have a complete answer. And, if you don’t have the right units at the end, you did something wrong.

PowerPower Power = W / t

Work is measured in Joules (J), or Foot-Pounds (ft-lbs)

Time is measured in hours or seconds (hr, s)

Power in measured in J/t (Joules per second) or horsepower (550 ft-lbs/s)

Work ProblemsWork Problems How do simple machines reduce the amount of

work?

How do gears work?

How do engines have horsepower?

Simple MachinesSimple Machines Simple Machines

Levers

Pulleys

Inclined Planes

– Wedges

– Screws

Fun with PhysicsFun with Physics Roller Coaster Physics

The Physics of Baseball

NASCAR Physics

Physics of Martial Arts

Movie Physics

Physics of Superheroes

Key ConceptsKey Concepts Energy is the capacity to do work Potential Energy is energy of position relative to gravity Kinetic Energy is the energy of motion There are many forms of energy, but any one form can be

converted to any other Energy is conserved Energy is released in collisions Energy is always conserved Impulse is momentum / time Work equals force times distance Power equals work divided by time Simple machines make work easier by increasing the distance

across which force is applied