Midterm: 11-1150am, Friday Oct 10, 2008. Q0 (review question) A block slides on a surface with an initial velocity 5m/s. If the surface becomes rougher,

Slides:

Advertisements

Similar presentations

Lecture – 3 Energy, Work and Momentum

Advertisements

Unit 7 Energy.  Energy is the ability to do work or cause change. I can work…but I won’t.

Chapter 9 “Heat” Honors Physics.

Q0 (review question) A block of 2kg slides on a surface with an initial velocity 5m/s. The frictional force between the block and the surface is 5N. How.

Phy100: More on Energy conservation Mechanical energy (review); Goals: Work done by external forces; Understand conservation law for isolated systems.

Phy100: More on Energy conservation 1) General conservation law for isolated systems; 2) Thermal energy.

Phy100: More on thermal energy 1)Thermal energy simulation: a microscopic point of view; 2) Energy transfer and heat; power. 3) On labs: data fitting.

Chapter 8: Potential Energy and Conservation of Energy.

Midterm and course website 1)Midterm: Friday, Oct 12, 2007 Please mark your calendar!! 2) Physics 100 Home Page

Energy – you can’t have change without it! Unit 2.

Chapter 7: Kinetic Energy and Work. Energy and Work Kinetic energy Work done by a constant force Work–kinetic energy theorem.

Mechanical Work: More Practice. Gravitational Potential Energy: More Practice.

Do Now Give an example for each of the following energy conversions. 1.Electrical → Thermal 2.Chemical → Mechanical 3.Electrical → Mechanical 4.Mechanical.

Roy Kennedy Massachusetts Bay Community College Wellesley Hills, MA Chapter 6 Thermochemistry 2008, Prentice Hall.

Thermal Energy. Atomic Motion  The macroscopic properties of a system are based on the microscopic behavior of atoms. Macroscopic equation of state:

Unit 1-3 Review 1. Calculate acceleration, distance, velocity & time Read position-time, velocity time graphs Define velocity, speed and acceleration.

Physics Review for the GHSGT. Speed Measure of how quickly an object gets from one place to another.

Dr. Jie Zou PHY 1151G Department of Physics1 Chapter 16 Temperature and Heat.

Mechanical Work and Power: Learning Goal The student will use appropriate terminology related to energy including work, gravitational potential energy,

Energy. Energy The capacity to do some kind of work. The capacity to do some kind of work. Involved when there is a change in matter Involved when there.

Heat and TemperatureSection 1 SPS7.c Determine the heat capacity of a substance using mass, specific heat, and temperature.

Work, Energy, and Power “It is important to realize that in physics today, we have no knowledge of what energy is.” - R.P. Feynman.

Temperature and thermal equilibrium Hot Cold. Temperature is proportional to the kinetic energy of atoms and molecules: T~KE.

Ch. 21 Temperature, Heat, and Expansion. Question to the class: Discuss with your neighbor, in what terms have we discussed energy so far? – What equations.

Work, Energy, and Power “It is important to realize that in physics today, we have no knowledge of what energy is.” - R.P. Feynman.

NOTES-Chapter 12 Thermal Energy. Heat is defined and expressed by the Kinetic Molecular Theory of heat.

Introduction to Simple Harmonic Motion Unit 12, Presentation 1.

Thermal Energy Heat & Temperature. Definitions  Energy  Can do work  Kinetic Energy  Energy associated with the motion of objects, large or small.

Thermal Physics Introduction. From mechanics to thermal physics Many concepts in thermal physics are based on mechanical concepts. For example, temperature.

Heat and the 2 nd Law of Thermodynamics.  Although we learned in the first law that the total amount of energy, including heat, is conserved in an isolated.

Thermodynamics. What is Temperature Temperature is a measure of the kinetic energy of matter. Collision between molecules causes energy transfer Motion.

Physics Review for the GHSGT. Types of energy Solar Electrical Nuclear Chemical Mechanical Potential Kinetic.

Heat Molecules and Motion The motion of molecules produces heat The motion of molecules produces heat The more motion, the more heat is generated The.

Temperature and Kinetic Theory

Temperature vs. Heat. Thermal Energy The total potential and kinetic energy of the particles in a system make up thermal energy. The kinetic energy comes.

Work Readings: Chapter 11.

1 Work and Heat Readings: Chapter Internal Energy -Initial kinetic energy is lost due to friction. -This is not completely true, the initial kinetic.

Chapter 5 Section 1: Temperature, Thermal Energy, and Heat.

Thermochemistry. Thermodynamics Study of energy transformations Thermochemistry is a branch of thermodynamics which describes energy relationships in.

Heat and Heat Technology. Temperature  …is the measure of the average kinetic energy of the particles in an object.  - the faster the particles, the.

THERMAL Energy Chapter 5.

Physics 101: Lecture 9, Pg 1 Physics 101: Lecture 9 Work and Kinetic Energy l Today’s lecture will be on Textbook Sections

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 1 Work Chapter 5 Definition of Work Work is done on an object.

ENERGY UNIT Common Assessment Review. DO NOW Turn in “How Much Energy” lab – remember that I am not taking it late so you need to turn in what you have.

Thermal Energy & Energy Transfer. Kinetic-Molecular Theory in a hot body, the particles move faster, and thus have a higher energy than particles in a.

The Measurement of Heat Calorimetry. Kinetic molecular theory Collective hypotheses about the particulate nature of matter and the surrounding space Greeks.

Temperature - A measure of how hot or cold. Measured in Celsius, Fahrenheit, and Kelvin. THERMAL ENERGY AND MATTER.

Physics 141Mechanics Lecture 24 Heat and Temperature Yongli Gao So far we have concentrated on mechanical energy, including potential and kinetic energy.

CHAPTER 4 ENERGY Energy changes With all motion energy is required. When an object moves it has Kinetic energy (motion). When an object is standing still.

Energy of Simple Harmonic Motion

Thermal Energy.

Temperature and Heat Unit 6: Thermal Energy.

Temperature (Sect. 8.2) There are two common temperature scales:

THERMAL ENERGY.

Energy IN = Energy OUT Means ALL Energy

Thermal Energy.

Chapter 11 Energy and Its Conservation

Work and Kinetic Energy

Temperature (Sect. 8.2)  There are two common temperature scales: Fahrenheit scale Fahrenheit scale ○ Water freezes at 32º and boils at 212º Celsius scale.

Work and Kinetic Energy

Temperature, Heat and Energy

THERMAL ENERGY.

Unit 3 - Energy Learning Target 3.2 – Be able to use the equations for Potential Energy & Kinetic Energy.

Mechanical Work and Power: Learning Goal

Energy IN = Energy OUT Means ALL Energy

Thermal Concepts Heat & Thermodynamics.

Temperature Main Concept:

Presentation transcript:

Midterm: am, Friday Oct 10, 2008

Q0 (review question) A block slides on a surface with an initial velocity 5m/s. If the surface becomes rougher, 1)There will be more heat generated; 2)There will be less heat generated; 3)The same heat generated; 4) The heat generated depends on the distance it travels.

Summary : Energy transfer, work and energy conservation for open systems Work is an energy transfer due to mechanical forces. W= +Fd or -Fd

Three Steps C. If there are external forces, calculate the work done. W =+ Fd if an external force F is applied along the direction of motion; (s is the distance). W=-Fd if the force F is applied opposite to the direction of motion. Power= W/t, work done per unit time. A. Correctly identify “ system” and “external forces”. B. Identify kinetic energy, potential energy and thermal energy. E(final)=E(initial) if external forces are zero.

Phy100: Thermal energy Goals: Microscopic view of thermal energy; Dynamic equilibrium.

What is thermal energy? Thermal energy is a measure of how hot an object is. Temperature is a quantity that can be used to characterize the amount of thermal energy. More precisely, thermal energy is the total energy of microscopic motions of atoms (either vibrational or rotational but at atomic scales). HOT physically, motions of atoms speed up!!

Simulations on heat and thermal energy Microwaves heat up coffeeMicrowaves heat up coffee

Temperature units: ºC, K, ºF Kelvin Scale, Celsius/centigrade scale, Fahrenheit scale

Power as the rate of energy transfer Units: 1watt=1W=1J/s

Dynamic Equilibrium A) To maintain a const water level of a reservoir; B)To maintain a constant temperature of a house. The incoming mass or energy flux= the outgoing mass or energy flux; Or P(in) = P(out).