Do Now 1. How do we find total mechanical energy? 2. A 3 kg soccer ball is travelling at 15 m/s when it is 9 m above the ground. A. What is its kinetic.

Slides:



Advertisements
Similar presentations
Reading Quiz A cannonball is dropped from a tower. As it falls,
Advertisements

Chapter 15 Energy Assignments 15.1 Math Skills 1-3 p 448; AQs 1-9 p452
ENERGY TRANSFORMATION. ● The Law of Conservation of Energy states that energy cannot be created nor destroyed. ● Energy can be transformed from one form.
Fall Final Review WKS: WORD PROBLEMS Part II. 1. A car travels at a constant speed of 15 m/s for 10 seconds. How far did it go?
Fall Final Review WKS: WORD PROBLEMS. Average Speed 1. A rock is dropped from the top of a tall cliff 9 meters above the ground. The ball falls freely.
 A weightlifter lifts a barbell 0.65 m with a constant force of 435 N. If it takes 280 W to move the barbell, how many seconds did it take?
Energy.
Conservation of Energy
Friday, March 19th Agenda Collect Conservation of Energy Worksheets
Mechanical Energy Copy these notes into your journal.
Chapter 7: Work and Energy (Ewen et al. 2005) Objectives: Related kinetic and potential energy to the law of conservation of mechanical energy. Related.
Law of Conservation of Energy
Chapter 15 Energy. Windup Toy xwCUzYuiTdkhttp:// xwCUzYuiTdk.
Work Kinetic Energy Potential Energy. Work is done when There is an application of a force There is movement of something by that force Work = force x.
Conservation of Energy Chapter 5 Section 3. What is Conservation? When something is conserved, it is said that it remains constant. The same holds true.
Energy. Energy & Work Closely related Energy: ability to do work Work: transfer of energy Both measured in Joules.
Energy Energyis anything that can be con- verted into work; i.e., anything that can exert a force through a distance Energy is anything that can be con-
How much work does a 154 lb. student do when climbing a flight of stairs that are 6 meters in height and 30 meters in length? If the stairs are climbed.
Unit 07 “Work, Power, Energy and Energy Conservation” The Conservation of Mechanical Energy Kinetic and Potential Energy.
Do Now: Determine the change in potential energy if a 3 kg box is raised from a height of 1 m to a height of 3 m.
Energy Chapter 7.
Equilibrium Forces and Unbalanced Forces. Topic Overview A force is a push or a pull applied to an object. A net Force (F net ) is the sum of all the.
Conservation of Mechanical Energy. Introduction “The laws of conservation are the cornerstone of physics.”
Chapter 15 Energy 15.1 Energy and Its Forms. How are energy and work related? Energy is the ability to do work. Energy and Work Work is a transfer of.
Aim: How can we explain the Law of Conservation of Energy? Do Now: Homework Review.
Work and Energy. What is energy? Defined as “ability to do work” But, what is work? Work = Force * displacement When work is done, energy is transferred.
5.3 The Conservation of Mechanical Energy THE PRINCIPLE OF CONSERVATION OF ENERGY The term conserved means constant.
Energy Study Guide for Review General Science. 1. Energy in the form of motion is ______ energy. kinetic.
ENERGY Energy.
Equilibrium Forces and Unbalanced Forces. Topic Overview A force is a push or a pull applied to an object. A net Force (F net ) is the sum of all the.
EQ: How is mechanical energy conserved in regards to potential and kinetic energy? LO: We will understand that energy can take many forms but the total.
Potential Energy Kinetic Energy Mechanical Energy
The ability to make something happen, to create a change
Chapter 5.2. What do you think? What is meant when scientists say a quantity is conserved? Describe examples of quantities that are conserved. Are they.
Work, Power & Energy How do they relate? (Stone, Ebener, Watkins)
 A weightlifter lifts a 45 kg barbell 0.65 m. If it takes 280 W to move the barbell, how many seconds did it take?
Do Now What is the difference between kinetic and potential energy?
Do Now Answer the following questions on your Daily Organizer:
Conservation of Energy IT’S THE LAW. Lifting a Ball When you lift a ball to a certain height you do work on it. When you lift a ball to a certain height.
Energy and Work Part 2. What is Work Work is the transfer of energy through motion –When force acts over a distance in the direction of an object’s motion.
Vocabulary Work Problems Potential Energy Problems Kinetic Energy Problems Extra Questions
Conservation of Energy (a.k.a Slacker Physics). Now, Really…Conservation of Energy In a system, energy can not be created or destroyed. Energy can change.
Warm Up For a pendulum in motion, when does it have the most potential energy? Kinetic energy? How are these maximums related? For a pendulum in motion,
Work-Energy Relationship Already understand that lifting an object will increase the object’s gravitational potential energy. W=ΔPE= mgΔh No friction.
Work is the product of a force moving an object a given distance.
Chapter 2 Extra Review.
ENERGY & POWER.
Do Now 10/29/14 5 minutes Take out Scratch Paper and Calculator for our Jeopardy Review Write down formulas PE = mgh, KE = ½mv2, TME = PE + KE Gravitational.
Cliff Diver A 50kg cliff diver climbs to a
Do Now: 1. Describe the energy conversion that takes place when a match is struck. 2. I spin a 2kg bucket of water around in a horizontal circle. The length.
Do Now Turn in Homework – it is LATE after the Do Now.
Let’s Play! Please listen carefully and think before answering.
Conservation of Energy
Do Now Heading: Energy Transformations
Motion Intro Questions
Conservation of Energy
6 8 5 Energy Breakout Solutions 750 J 1500 W 225 N 2700 J
Energy.
7.2 Conservation of Energy
Free Fall Free fall: when an object is only affected by gravity
Chapter 9.3 Mechanical Energy.
Kinetic and Potential Energy
Energy Review.
Potential vs. Kinetic Energy
Catalyst – Tuesday 18th 1. Give two examples of heat convection.
Let’s Play! Please listen carefully and think before answering.
Physical Science Chapter 13 Section 3
7.2 Conservation of Energy
Energy and Momentum.
GRAVITATIONAL POTENTIAL & KINETIC ENERGY
Presentation transcript:

Do Now 1. How do we find total mechanical energy? 2. A 3 kg soccer ball is travelling at 15 m/s when it is 9 m above the ground. A. What is its kinetic energy? B. What is its potential energy? 3. What does the law of conservation of energy state?

Today’s Agenda 5 min Do Now 5 min Important Dates 40 min Energy Review 10 min Practice Test

Today’s Agenda 5 min Do Now 5 min Important Dates 40 min Energy Review 10 min Practice Test

Important Dates & Reminders  Final Exam Next Thursday!  Tutoring during advisory or after school most days!  Monthly News Project  Due on next Tuesday  Photography Project  Due Friday, May 4 th  Extra Credit Opportunities  US Space and Rocket Center Thank You Letter Due Monday, May 7 th  Extra Monthly News Project Due Friday, May 4 th

Today’s Agenda 5 min Do Now 5 min Important Dates 40 min Energy Review 10 min Practice Test

TME is the sum of all kinetic and potential energy. Total Mechanical Energy

Total Mechanical Energy Graphs Potential energy is plotted with the total mechanical energy on the graph below. What does the graph of kinetic energy look like? Position (m) Energy (J) Total mechanical energy PE Position (m) Energy (J) Total mechanical energy PE KE ½ Total

Example  A 40-kg skydiver has a speed of 25 m/s when he is 300 m above the ground.  What types of energy does he have?  Calculate the values for both types of energy.  Calculate total mechanical energy.

Student-Guided Example  A 2 kg soccer ball has a speed of 15 m/s when it is 10 m above the ground.  What types of energy does it have?  Calculate the values for both types of energy.  Calculate total mechanical energy.

Think-Pair-Share  A 0.5 kg paper airplane has a speed of 4 m/s when it is 3 m above the ground.  What types of energy does it have?  Calculate the values for both types of energy.  Calculate total mechanical energy.

Complete the three independent practice problems on the Daily Organizer. Independent Practice

Energy cannot be created or destroyed. Energy can only be transferred from one form to another but the total amount never changes! Law of Conservation of Energy

 The sum of KE and PE remains constant.  One type of energy changes into another type.  For the falling book, the PE of the book changed into KE as it fell.  As a ball rolls up a hill, KE is changed into PE. PE I + KE I = PE F + KE F

Kinetic and potential energy convert to one another KE max no PE PE max no KE PE max no KE

Example  A 4 kg crate is dropped from the top of a 20 m tall ledge and falls to the ground.  What was its initial potential energy?  What was its initial kinetic energy?  What was its final potential energy?  What was its final kinetic energy?

Student-Guided Example  A 7 kg crate is dropped from the top of a 40 m tall ledge and falls to the ground.  What is its initial potential energy?  What is its initial kinetic energy?  What is its final potential energy?  What is its final kinetic energy?  What is its final speed?

Think-Pair-Share  A 40 kg skydiver drops from an airplane, which is 1500 m high in the air. What is the kinetic energy of the skydiver when he gets to the ground?  Find the initial potential energy.  Find the initial kinetic energy.  Find the final potential energy.  Find the final kinetic energy.  Find the final speed of the diver.

Tag Team Problems

Tag Team 1  A 3 kg bowling ball is dropped from a building that is 10 m tall. How fast is the ball going right before it hits the ground?  Partner 1: Find the initial potential energy and the final kinetic energy.  Partner 2: Find the final speed.  Partner 3: Check their work

Tag Team 2  A 0.7 kg book falls from the top of a shelf that is 3.5 m tall. How fast is the book going right before it hits the ground?  Partner 1: Find the initial potential energy and the final kinetic energy.  Partner 2: Find the final speed.  Partner 3: Check their work

Multiple Choice Problem

Law of Conservation of Energy  A 2 kg crate is dropped from the top of a 40 m tall ledge and falls to the ground. What is its speed when it hits the ground? A. 28 m/s B. 40 m/s C. 80 m/s D. 784 m/s

Law of Conservation of Energy  A 2 kg crate is dropped from the top of a 40 m tall ledge and falls to the ground. What is its speed when it hits the ground? A. 28 m/s B. 40 m/s C. 80 m/s D. 784 m/s

Complete the three independent practice problems on your Daily Organizer. Independent Practice

Independent Practice Problems 1. A 1 kg plate was at rest on a tabletop 1.5 m above the ground before falling to the ground. What was its speed right before it hits the ground? 2. A 0.5 kg rock is dropped from a cliff 70 meters high. What is its speed right before it hits the ground? 3. A 0.25 kg apple falls from a tree that is 16 m tall. What is the speed of the apple right before it hits the ground?

Silently and independently complete the provided exit ticket. When you are finished, work on the homework (practice test). Exit Ticket

Today’s Agenda 5 min Do Now 5 min Important Dates 40 min Energy Review 10 min Practice Test

You have the next 10 minutes to silently and independently work on the practice test that is due Friday. Feel free to ask questions during this time! Practice Test