Chapter 3 Review 8 th Grade Science Work

Chapter 3 Review 8 th Grade Science Work Energy is the ability to do ____

Energy Kinetic Potential Chemical Radiant Definition The energy an object has because it is in motion. Stored energy that depends on the interaction of objects, particles, or atoms. Example Running, Moving Car Kite in a tree Energy that is stored in and released from the bonds between atoms Fossil fuels, coal, oil, gasoline, match, food you eat The energy carried by electromagnetic waves. Visible light, electromagnetic spectrum

Energy Thermal Mechanical Sound Definition The sum of KE and PE of the particles that make up an object. The sum of potential energy and kinetic energy in a system of objects. The form of energy associated with the vibration or disturbance of matter. Example Heat Windmill, Roller Coaster, Car Echolocation

Energy Nuclear Electrical Seismic Definition Energy stored in and released from the nucleus of an atom. The energy that an electric current carries is a form of KE. The energy transferred by waves moving through the ground. Example Fission, Fusion, Power Plant Outlet Earthquake

How can you increase an object’s Kinetic Energy? 1. Increase Mass 2. Increase Velocity A lit match produces which two types of energy? Radiant Energy & Thermal Energy

State the Law of Conservation of Energy cannot be created or destroyed by ordinary means. Energy can be transformed from one form to another. Compare and contrast energy transfer and energy transformation. Energy transfer is when energy travels from one object to another. Energy transformation is when energy is converted to another form.

Joe lifts a bag of cement 2 meters above the floor, using a force of 125 N. How much work is being done on the bag of cement? W = F x d W = 125 N x 2 m W=250 J Give an example of: • Inclined Plane Ramp, Slide • Lever Seesaw • Wheel & Axle Manual Pencil Sharpener

Give four energy transformations that happen when lighting a match. Sliding Match across box → Mechanical Energy Tip of Match (Sulfur) → Chemical Energy Spark → Radiant Energy Fire → Thermal Energy

Draw a picture of a ball falling in the air. Label the points of G. P. E. and K. E. Explain the transformation between kinetic and potential energy C B A D E The ball has Kinetic Energy at points A & B. At Point C the energy is transformed into potential energy. Points D & E both have kinetic energy. Point C has the greatest Potential Energy & Point E has the most Kinetic Energy (right before the ball goes into his hand)

Organize all the forms of energy into the chart below. Potential Nuclear Kinetic Electric Chemical Gravitational Elastic Both KE + PE Waves Mechanical Thermal Seismic Radiant Sound