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CONSERVATION OF ENERGY Chapter 2 Section 8 & 9 GOOD MORNING! Today we will: Watch an intro video Connect energy with Ch 3 Sec 2 What Do You See Materials you need: Lab Notebook Textbook Something to write with Before we get to airbags… We need to review forms of Energy! Let’s take a look back at our seatbelt video The physicist in the video mentioned that a seatbelt’s purpose is to absorb the ____________ energy of the person inside the car But what exactly is ____________ energy? IN YOUR LAB NOTEBOOK Table of Contents & New Blank Page Chapter 2 Sec 8/9 Potential and Kinetic Energy: Energy of the Pole Vault Pg. 220 WHAT DO WE NEED TO KNOW? Essential Questions: What is Kinetic Energy? What is Potential Energy? What is the Conservation of Energy? Learning & Language Objective: I will be able to describe how energy changes form and its relation to velocity, height, and bend of a pole vaulter. WHAT DO YOU SEE? WHAT DO YOU SEE? Compare and Contrast the Kinetic Energy of our last two WHAT DO YOU SEE photographs Pg. 220 Pg. 266 Please use your Constructing Meaning flipbook for assistance (page 5). GOOD AFTERNOON! Today we will: Finish Compare & Contrast What Do You Think Skate Park Lab Materials you need: Lab Notebook Something to write with WHAT DO YOU SEE? Compare and Contrast the Kinetic Energy of our last two WHAT DO YOU SEE photographs Pg. 220 Pg. 266 Please use your Constructing Meaning flipbook for assistance (page 5). WHAT DO YOU THINK? What factors do you think might limit how high a pole vaulter can go? POLE VAULTING What exactly is pole vaulting?? Let’s take a look! https://www.youtube.com/watch?v=WeVOPq2Nsjg POLE VAULTING Did Sean ever CREATE ENERGY? SKATE PARK LAB You have 1 min to get into groups of 2 Everyone will be turning in a worksheet! At the top of the first table, please record the mass of each object PHET Skater Max PE Min PE Max KE Star Skater Bulldog Bug SKATE PARK LAB All completed lab worksheets need to be turned into the white basket once you are finished! GOOD MORNING! Today we will: Warm-Up Complete Skate Park Lab Begin the Physics Talk Materials for today: ½ sheet of notebook paper Lab Notebook Textbook Something to write with WARM UP QUESTION On your ½ sheet of notebook paper: Where do you see Kinetic and/or Potential energy in the skater on the ramp? SKATE PARK LAB You have to complete the PHET lab TODAY. Turn in your completed lab into the white basket If you are finished with the lab before time is up, please open your textbook to pg. 222 and begin reading the Physics Talk. Please take notes while you are reading! GOOD MORNING! Today we will: Warm Up Physics Talk Materials we need: Lab Notebook Textbook WARM UP! Spend 2-3 min discussing with your elbow partner what was the purpose of our lab last week What did we find out?? PHYSICS TALK In your textbook… Turn to pg. 222 – 227 You and your elbow partner will: Split up the Physics Talk reading and share what you read with each other Take notes on any important vocab/equations/concepts you come across while reading PHYSICS TALK Energy The ability to do Work Energy = Work …but what is Work? Take Notes! Take Notes! PHYSICS TALK Work product of force and distance of an object Equation Work = Force X distance W=Fxd W Units Joules (J) F d ÷ x Is work done if a large force is applied and an object doesn‘t move? PHYSICS TALK Kinetic Energy (KE) Energy in motion The FASTER the speed (velocity), the MORE Kinetic Energy (KE). The SLOWER the speed ( velocity), the LESS Kinetic Energy(KE). Equation Kinetic Energy = ½ mass x velocity2 KE = ½ mv2 Take Notes! Units Joules (J) PHYSICS TALK Gravitational Potential Energy (GPE) Take Notes! Stored Energy Height GPE GPE = mass x gravity x height Equation GPE = m x g x h Units Energy = Joules (J) PHYSICS TALK Elastic Potential Energy (EPE) Stored energy in a spring Equation Elastic PE = ½ kx2 k = spring constant x = displacement of the spring Units Energy = Joules (J) Take Notes! CONSERVATION OF ENERGY Can energy ever be created or destroyed? It can only change _____________. CONSERVATION OF ENERGY Energy can never be created or destroyed, it can only change form. Therefore: Work = KE = GPE = EPE ½ mv2 mgh Any change in energy is due to work ½ kx2 CONSERVATION OF ENERGY 1. Pole vaulter is waiting to run. Energy? CONSERVATION OF ENERGY 1. 2. Pole vaulter is waiting to run. Energy? Pole vaulter begins to run. Energy? CONSERVATION OF ENERGY 1. 2. 3. Pole vaulter is waiting to run. Energy? Pole vaulter begins to run. Energy? Pole vaulter plants pole in the ground, causing her to stop but pole to bend. Energy? CONSERVATION OF ENERGY 1. 2. 3. 4. Pole vaulter is waiting to run. Energy? Pole vaulter begins to run. Energy? Pole vaulter plants pole in the ground, causing her to stop but pole to bend. Energy? Pole Vaulter is flung into the air. Energy? PRACTICE: I DO 1. W F d If a quarterback applies a 100N force on a football for a distance of .5m as he is throwing to one of his receivers, how much energy does he put into the ball? PRACTICE: WE DO 2. If a soccer player accidentally slams into a stationary wall with a force of 500N, how much work does she do on the wall? PRACTICE: YOU DO 4. A student lifts a box of books which weighs 100N. The box is lifted 2m high. How much work does the student do? 5. Two students together exert a force of 1000N in pushing a car. They exert 20,000 J of work on the car. What is the distance they pushed? 6. A fork lift raises a box 2.0m by doing 6000.0J of work on it. What is the weight of the box? 7. A .2 kg football falls 3m, how much work does the force of gravity do on the ball? (Hint: F = m · a ) GOOD MORNING! Today we will: Review EPE, GPE, KE Do Practice Problems Prepare for quiz Materials we need: Lab Notebook Calculator Something to write with WARM UP How much energy is stored in a pole with a spring constant of 15 N/m if it is deflected 1.6m?
