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Section 1 Energy Conservations All assigned readings are in the textbook; the pages you will need to refer to are stated before the questions to be answered. Read all parts of your assignment carefully and record your answers in the appropriate places. Be sure and proofread your answers carefully before submitting your Read each question carefully, and decide which of the choices BEST completes the statement or answers the question. Place your answer in the blank space provided Read pages 80 to 83 in your textbook, and answer the following questions 1) A car moving at a constant speed up a ramp A. gains potential energy loses potential energy C. gains kinetic energy D. does not gain or lose energy 2) A book falling from a tabletop A. gains both potential and kinetic energy B. loses both potential and kinetic energy C. gains potential energy and loses kinetic energy Bloses potential energy and gains kinetic energy 3) Cora is swinging back and forth on a swing. Which of the following statements is correct? A. At the bottom of the swing, Cora's potential energy is a maximum and her kinetic energy is zero. B. At the top of her swing, Cora's potential energy is a maximum and her kinetic energy is zero. At the bottom of her swing, Cora's potential energy is a minimum and her kinetic energy is zero. D. At the top of her swing, Cora's potential energy is a minimum and her kinetic energy is zero. OUTREACH PROGRAMS Science 24 - Module 2 CHAPTER 5 Energy Conversions As Jamie Sale and David Pelletier complete a difficult move training and a carefully controlled diet help them transform chemical energy into motion Getting Ready... - List three kinds of energy used around the home - Is all the energy that goes into a mixer used to mix the food in the bowl? . Much of the energy that goes into a dragster is not used to move it down the track. Suggest two other ways the energy is used A dragster converts the potential energy of fuel into the mechanical energy that drives it down the track that . Science Log L. Develop an Energy Transfer flowchart that uses a series of circles around a central point. At the centre, place the title Energy I Use. List five ways you use energy in the first ring. List the source of each kind of energy in the second ning List where each of these energies came from in the third ook at the photograph of Jamie Sal and David Pelletier Stored energy from the food they have eaten allows them to complete difficult skating figures Fuel in the dragster works in a similar way to the food the skaters eat. That is because in energy transformations, food is a fuel. The roar of unmuffled engines sound energy), flames exploding from exhaust pipes Tsound, light, and thermal energy), and heat from engines and spinning tires (thermal energy) all point to these other energy conversions Consider how your life is tied to forms of energy and energy changing from one form to another. For example, you may depend on an alarm clock changing electric energy to sound energy to wake you up in the morning. For breakfast, you probably expect electric energy to convert to thermal energy to cook your eggs and toast How would your life be changed if it were not possible to convert kinetic and thermal energy? In this chapter you will take a closer look at the sources of energy you use. You will examine ways some forms of energy convert to other forms of energy. In the dragster, one kind of energy transforms to several other kinds. You will also learn how scientists account for all energy conversions. 5.1 Energy P 1 Energy is the ability to do work. It can cause changes to the temperature, shape, speed, or direction of an object Where does your body get its energy? The human body converts stored (potential energy in food into other forms of energy. Eating the right foods provides you with energy Exercise speeds up the release of chemical energy from food stored in the muscles. Sleep gives the body's cells a chance to clear waste products and renew stores of energy Using Energy to Do Work Like the people in the pictures, you use potential and kinetic energy throughout the day. In the morning, you depend on potential energy when you turn on a light as you get out of bed. At breakfast, you count on potential energy from the foods you eat to fuel your body. Potential energy becomes useful energy when: electric energy is converted to light energy to illuminate your room the stored energy in food is converted to kinetic energy as you walk out the door. Moring Figure 5.1 Expert golfers like Tiger Woods master the way their muscles transfer energy to their club and then to the ball. They control the transfer of energy in ways that affect the golf bail's speed, direction, and behaviour of a ball is hit one way, it will roll forward when it lands. Hit another way, it will roll back In order to get a good shot, golfers depend on energy changing from one form to another. For example, energy is converted in the golfer's muscles during the swing. When the club hits the ball, transmits some of its energy to the ball READING Check List three ways potential energy is useful to you Try This! Figure 5.2 These tubers have potential energy. Sitting at the top of a hill, they are in a position to do work Figure 5.3 Kinetic energy is energy due to motion. As they slide down the hill, tubers are doing work. Practise serving a large, soft volleyball. Experiment with different ways of hitting the ball. What can you do to make the ball spin forward and backward when it hits the ground? 82 MHR Energy Transformations