24/25 Unit 4 Outline Slideshow

Question 1

Energy cannot be___

Answer 1

Created or destroyed, it can only be transformed from one form to another.

Question 2

Thermal Energy

Answer 2

Sum of the kinetic and potential energy of the particles that make up an object

Question 3

Radiation

Answer 3

Transfer of energy by electromagnetic waves.

Question 4

Conduction

Answer 4

Transfer of thermal energy by collisions between the particles that make up matter.

Question 5

Convection

Answer 5

Transfer of thermal energy in a fluid by the movement of warmer and cooler fluid from one place to another.

Question 6

Therman energy examples

Answer 6

-Stove
-iron
-heater
-microwave oven
-toaster
-fireplace

Question 7

Conduction examples

Answer 7

-ironing clothes
-cooking on a gas Stove
-ice melting in hand
-metal spoon in hot soup
-computer cpu’s
-car engine cooling
-lighting a match
-hot coffee in a mug

Question 8

convection examples in everyday life

Answer 8

-boiling water
-hot air balloons
-sea and ocean currents
-cooking in ovens
-hair dryers
-greenhouse effect

Question 9

Radiation examples

Answer 9

-sunlight
-x-rays
-microwave ovens
-radio waves
-ultraviolet light
-wi-fi signals
-remote controls
-MRI Scans

Question 10

Thermodynamics

Answer 10

study of the relationship between heat, work, temperature and energy.

Question 11

States that if the mechanical energy of a system is constant, the increase in thermal energy of that system equals the sum of the thermal energy transfers into that system and the work done on that system.

Answer 11

First Law of Thermodynamics

Question 12

States that energy spontaneously spreads from regions of higher concentration to regions of lower concentration. Systems always move to more stable states, or states with uniform energy distribution.

Answer 12

Second Law of Thermodynamics

Question 13

Examples of First Law of Thermodynamics

Answer 13

Example: Increase temperature of your hands by warming them near a fire and by rubbing them together.

Question 14

Second Law of Thermodynamics
examples

Answer 14

Example: Heat from radiator transfers to cat but not the reverse.

Question 15

Second Law of Thermodynamics
___

Answer 15

the higher the thermal energy and the warmer an object becomes.

Question 16

Explain how greenhouses work. What type of thermal energy transfer is occurring in a greenhouse? Use arrows to indicate how the energy is transferred from the sun to the plants inside the greenhouse image below.

Answer 16

Greenhouses use solar radiation to trap heat. Heat enters the greenhouse through its covering of glass or plastic and starts to warm the soil and plants inside. The warmed air near the soil begins to rise and is immediately replaced with cooler surrounding air that starts to heat up. This cycle raises the temperature inside the greenhouse more rapidly than the air outside, creating a sheltered, warmer microclimate.

Question 17

A vacuum is an ___.A vacuum between the two outer walls of a thermos bottle___.t limits or reduces the transfer of energy between the bottle’s contents and its surroundings. This keeps the temperature of the contents of the thermos at its original temperature.

Answer 17

1.extremely good insulator
2. minimizes the transfer of thermal energy from conduction and convection.

Question 18

If a piece of paper is placed between two colliding spheres as shown below, holes will be burned in the paper where the steel spheres meet. Describe all the transformations of energy between the two steel spheres and the paper.

Answer 18

After the spheres collide, the particles of matter in the spheres begin to vibrate faster which increases the thermal energy of the particles.

The force of the colliding spheres causes the thermal energy of the paper to increase, which burns the hole in the paper.

Question 19

Potential Energy-

Answer 19

stored energy

Question 20

formula ~

Answer 20

PE = mgh