Grade 4 | Science | Unit 2 - Concept 2 - Lesson 3 - Types of Energy - potential and kinetic energy скачать в хорошем качестве

Grade 4 | Science | Unit 2 - Concept 2 - Lesson 3 - Types of Energy - potential and kinetic energy

Welcome dear students! Forms of potential energy 1. Gravitational potential energy • The Earth attracts objects to its surface by a force called gravitational force (gravity). • When an object is raised up against the Earth's gravity, this object stores gravitational potential energy. Example: The roller coaster at the top of a hill stores gravitational potential energy. 2. Chemical potential energy Example: • The batteries store chemical potential energy. • The chemical potential energy stored in the battery is not used until this battery is connected to a device. Note When a spring is compressed, it stores potential energy inside it. Factors affecting potential energy of an object: 1. Mass By increasing the mass, the potential energy increases. Example: Ball 1 that has a mass of 500 grams has a greater potential energy than ball 2 that has a mass of 40 grams. 2. Height By increasing the height from the Earth's surface, the potential energy increases. Example: Ball 1 at a height of 1 meter has a greater potential energy than ball 2 at a height of 1/2 meter. Forms of Kinetic Energy 1. Sound energy • As: Movement of sound waves in the air. 2. Light energy • As: Movement of light waves in the air. 3. Electrical energy • As: Movement of electricity through wires. 4. Thermal energy • As: Vibration of particles in a substance during heating. Changing of potential energy into kinetic energy: Example 1 : • A child at the top of a playground slide has potential energy. • When the child moves down along the slide, the potential energy changes into kinetic energy. Example 2 : • The egg has potential energy when it is in the boy's hand. • The egg has kinetic energy as it falls down. Types of Energy Energy can be: 1. Transferred • Definition: Energy is transferred from one place to another. • Example: When you kick a ball, kinetic energy of your leg is transferred to the ball. 2. Transformed (changed) • Definition: Energy is continuously changing and transforming from one form into another form. • Example: When the roller coaster goes down the hill, its potential energy is transformed into kinetic energy. Some Changes of Potential Energy into Kinetic Energy Flashlight • From: Chemical energy stored in batteries. • Into: Light energy and thermal energy (heat). Gas Oven • From: Chemical energy stored in natural gas. • Into: Thermal energy. Spring-powered Car Toy • From: Potential energy stored in the spring wire. • Into: Kinetic energy and sound energy. Real Car • From: Chemical energy stored in gasoline. • Into: Kinetic energy, sound energy, and thermal energy. #Science_Grade4 #mrraoufashraf #ScienceGrade4 #EnergyInScience #PotentialEnergy #KineticEnergy #FormsOfEnergy #EnergyTransformation #EnergyTransfer #GravitationalPotentialEnergy #ChemicalEnergy #LearningScience #PrimaryScience #ScienceForKids #FunWithScience #FutureScientists Mr. Raouf Ashraf