RK Patrol.

Slides:

Advertisements

Similar presentations

Physics Energy.

Advertisements

11.2 notes.  In other words, all the kinetic energy in a system plus all the potential energy of a system is total amount of mechanical energy in the.

AP PHYSICS REVIEW Energy. Work  Work is when a force is applied to an object to move it a distance.  W = Fd cos( Ɵ )  Work can be done by many forces.

Kinetic and Potential Energy

CONSERVATION OF MECHANICAL ENERGY

Chapter 7: Work and Energy (Ewen et al. 2005) Objectives: Related kinetic and potential energy to the law of conservation of mechanical energy. Related.

Kinetic and Potential Energy

There are 2 forms of energy… Kinetic Energy Potential Energy.

When we say something is conserved, we mean it remains constant.

Chapter 15 Energy Assignments 15.1 Math Skills 1-3 p 448; AQs 1-9 p452

Physics Chapter 11 Energy.

Energy Chapter 5 Section 2.

There are 2 forms of energy… Kinetic Energy Potential Energy.

Unit 2 Lesson 2 Kinetic and Potential Energy

Mechanical Energy. Kinetic Energy, E k Kinetic energy is the energy of an object in motion. E k = ½ mv 2 Where E k is the kinetic energy measured in J.

Energy is Conserved. Page 220 Example 7.9 Gravitational Potential Energy = mgh = mgy Elastic Potential Energy = ½ky 2 F spring = ky Kinetic Energy = ½mv.

Daily Agenda Ms. DeSalvo December 5, CPS Bell Ringer: 12/5/13 Activity: Energy Review 1.What is the unit for energy? 2.T or F? If an object has.

SP1.Students will analyze the forms and transformations of energy.

Aim: How can we explain the Law of Conservation of Energy? Do Now: Homework Review.

Conservation of Energy. The Law of Conservation of Energy Energy cannot be CREATED or DESTROYED. Energy is just CONVERTED from one form to another.

Potential energy is the stored energy of an object.

Energy  Change Requires Energy  What is energy? –The ability to cause change or do work  Is energy scalar or vector?

Conservation of Mechanical Energy Mechanical Energy – The sum of Potential and Kinetic Energies ME=PE+KE The conservation of mechanical energy states that.

Section 15.1Energy and Its Forms

Energy – the ability to do work W = Fd = m a d V f 2 = V i 2 + 2a  x V f 2 - V i 2 = + 2a  x V f 2 - V i 2 = a  x 2.

STORED ENERGY Wood is stored chemical energy until it is burned and the potential energy is released. A ball held above the ground has potential energy.

Potential energy is the stored energy of an object.

Energy. Energy and Work Energy – the ability to do work Work is a transfer of energy Energy is also measured in Joules.

Unit 7: Work, Power, and Mechanical Energy.

Unit 2 Lesson 2 Kinetic and Potential Energy

Potential Energy and Conservation of Energy

Work-Energy Theorem Recall that Work equals a change in the kinetic energy of an object ( W = ∆KE). Therefore, W = KEafter - KEbefore Also recall.

What is it? What makes it change?

Unit 2 Lesson 2 Kinetic and Potential Energy

Section 3 Conservation of Energy

Chapter 5.3 Review.

Energy. Energy Energy (def.) the ability to do work. Unit is Joules. Work and energy are interrelated. Work must be done on an object to get it to.

Aim: How is energy Conserved?

Unit 2 Lesson 2 Kinetic and Potential Energy

KE and PE Practice Quiz Solutions.

Section 11.2 Conservation of Energy

Conservation of Energy

Energy – the ability to do work W = Fd = m a d Vf 2 = Vi2 + 2aDx Vf 2 - Vi2 = + 2aDx Vf.

Chapter 5 Work and Energy.

Energy: Forms and Changes

Energy Chapter 4.

Potential Energy.

Work-Energy Theorem Energy is the ability to do work.

Review of Work and Power

Chapter 5 Definition of Work

Chapter 11 Energy and Its Conservation

Energy Chapter 11.

Kinetic and Potential Energy

PE, KE Examples Answers 1. A shotput has a mass of 7.0 kg. Find the potential energy of a shotput raised to a height of 1.8 m. m = 7.0 kg h.

Momentum September 21, Momentum September 21, 2010.

Physical Science Chapter 13 Section 3

Chapter 5.2 Review.

In this section you will:

Ch 4 Energy Kinetic Energy (KE) – the energy a moving object has because of its motion; depends on mass and speed of object KE = mv2/2 Joule – SI unit.

Potential and Kinetic Energy

Ch 8 Energy Notes ENERGY – 5.2 PPT.

GRAVITATIONAL POTENTIAL & KINETIC ENERGY

GIG Read the passage and mark your answers on your whiteboard. NOT ON THE PAPER. Questions or

Presentation transcript:

RK Patrol

The HOT, BURNING News TODAY: Mechanical Energy and its types: DISCOVERED What is meant by Conservation of Mechanical Energy: ANSWERED THINGS TO REMEMBER when solving conservation of Energy problems Formulas to be IMPLANTED on mind and EXAMPLES of Energy Transfers Problem SOLVED

Mechanical Energy and its types: DISCOVERED Mechanical Energy is the sum of KINETIC and POTENTIAL ENERGY. 3 TYPES: Kinetic Energy a.k.a. KE Gravitational Potential Energy a.k.a PEg Elastic Potential Energy a.k.a. PEs

What is meant by Conservation of Mechanical Energy: ANSWERED In a closed system, nothing leaves and nothing enters. Therefore, in a closed system, total mechanical energy is conserved. An example of a mechanical system: A satellite is orbiting the Earth only influenced by the conservative gravitational force and the mechanical energy is therefore conserved.

THINGS TO REMEMBER when solving conservation of Energy problems Carefully identify the system. Make sure it is closed; no objects can enter it or leave it. It must also be isolated; no external force can act on any object in the system. Thus, no work can be done on or by objects outside the system. Is friction present? If it is, then the sum of kinetic and potential energy will not be constant. But, the sum of kinetic energy, potential energy and the work done against friction will be constant. Finally, if there is no friction, find the initial and final total energies and set them equal

Formulas to be IMPLANTED on mind and EXAMPLES of Energy Transfers KEi + PEi = KEf + PEf PE = mgh KE = ½ mv2

Formulas to be IMPLANTED on mind and EXAMPLES of Energy Transfers KEi + PEi = KEf + PEf PE = mgh KE = ½ mv2

Formulas to be IMPLANTED on mind and EXAMPLES of Energy Transfers KEi + PEi = KEf + PEf PE = mgh KE = ½ mv2

Formulas to be IMPLANTED on mind and EXAMPLES of Energy Transfers KEi + PEi = KEf + PEf PE = mgh KE = ½ mv2

Problem SOLVED Problem: A large chunk of ice with mass 15.0 kg falls from a roof 8.00 m above e the ground a. Find the kinetic energy of the ice when it reaches the ground b. What is the speed of the ice when it reaches the ground? c. Is the answer the same as you would determine by solving as a constant acceleration problem?

Problem SOLVED Given: m = 15.0 kg Unknowns: a. Kef b.Vf g = 9.80 m/s2 Basic Equations: KEi + PEi = KEf + PEf Given: m = 15.0 kg g = 9.80 m/s2 h = 8.00 m KEi = 0 PEf = 0 Solution: KEi + PEi = KEf + PEf 0 + mgh = KEf + 0 KEf = mgh = (15.0 kg) (9.80 m/s2) (8.00 m) = 1.18 x 10^3 J

Problem SOLVED b. KEf = ½ mvf2 vf2 = 2KEf = 2(1.18 x 10^3 J) =157 m2/s2 m 15.0 kg vf = 12.5 m/s c. yes

THE END

Questions to Answer I. IDENTIFICATION 1. What is mechanical energy? 2 – 4. Give the 3 types of Mechanical energy and their corresponding examples. (0.5 point each number) 5. What is meant by Conservation of Mechanical Energy?

6. A mechanical system has been mentioned earlier and in connection to that, cite an example of it. 7-9. Identify the formulas needed to be implanted on mind with regards to this topic. 10. What formula would perfectly suit to this problem and how is it derived? Bill throws a 10 g ball straight down from a height of 2.0m. The ball strikes the floor at a speed of 7.5 m/s. What was the initial speed of the ball?