Thermal Energy On The Move Chapter 7 Lesson 3 Thermal Energy On The Move

Objects contain thermal energy, not heat. Heat is thermal energy moving from higher temp to lower temp. Objects contain thermal energy, not heat.

Conduction Conduction is the transfer of thermal energy due to collisions between particles in matter. When faster-moving particles collide with nearby particles at slower speeds, thermal energy is transferred. A material in which thermal energy moves quickly is called a thermal conductor.

Conduction (cont.) Solids are better thermal conductors than liquids and gases. Most metals are excellent thermal conductors. A material in which thermal energy moves slowly is a thermal insulator. A winter coat filled with an air-trapping material is a good example of a thermal insulator.

Convection Convection is the transfer of thermal energy by the movement of particles from one part of a material to another. Convection occurs in liquids and gases. Convection begins when part of a liquid or gas becomes warmer than the rest of it. The cooler, denser liquid or gas falls, pushing the warmer, less dense liquid or gas to the top.

Radiation Radiation is the transfer of thermal energy from one object to another by electromagnetic waves. Radiation transfers thermal energy through matter or through space, where no matter exists. Radiation occurs between objects that are not in contact.

Radiation (cont.) All objects give off electromagnetic waves, but most are not visible. Extremely hot objects emit visible light. Electromagnetic waves carry energy and radiation transfers this thermal energy from objects at higher temperatures to objects at lower temperatures.

A. conduction B. convection C. insulation D. radiation Which term describes the transfer of thermal energy due to collisions between particles in matter? A. conduction B. convection C. insulation D. radiation

D. electromagnetic conductor Which term describes a material in which thermal energy moves quickly? A. particle B. convection current C. thermal conductor D. electromagnetic conductor

C. electromagnetic waves D. particles in motion Radiation is the movement of energy by which of these? A. conduction B. convection C. electromagnetic waves D. particles in motion

A. energy B. friction C. motion D. work Chapter 7 Total review Which term describes the ability to cause change? A. energy B. friction C. motion D. work

A. thermal energy B. sound energy C. radiant energy D. kinetic energy Which type of energy is due to the motion of particles that make up an object? A. thermal energy B. sound energy C. radiant energy D. kinetic energy

A. friction B. work C. kinetic energy D. waste energy What is a force that resists the sliding of two surfaces that are touching? A. friction B. work C. kinetic energy D. waste energy

A. waste energy B. thermal energy C. radiant energy D. electric energy Most of the chemical energy used in cars ends up as what kind of energy? A. waste energy B. thermal energy C. radiant energy D. electric energy

D. electromagnetic wave Which term describes a material in which thermal energy moves slowly? A. particle B. thermal conductor C. thermal insulator D. electromagnetic wave

A. conduction B. convection C. heat D. radiation What term refers to the transfer of thermal energy by the movement of particles from one part of a material to another? A. conduction B. convection C. heat D. radiation

A. electric energy B. mechanical energy C. radiant energy What is another term for light energy carried by electromagnetic waves? A. electric energy B. mechanical energy C. radiant energy D. thermal energy

A. force and mass B. mass and distance C. force and distance Work depends on what two factors? A. force and mass B. mass and distance C. force and distance D. speed and mass

Which is true according to the law of conservation of energy? A. Energy can be created and destroyed. B. Energy can be created, but not destroyed. C. Energy cannot be created or destroyed. D. Energy cannot be created, but can be destroyed.

A. chemical energy B. electric energy C. potential energy Friction between a bicycle’s brake pads and the moving wheels transforms mechanical energy into what kind of energy? A. chemical energy B. electric energy C. potential energy D. thermal energy What describes thermal energy moving from a region of higher temperature to a region of lower temperature? A. conduction B. convection C. friction D. heat