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Science -8 > Forms of Energy > Flashcards

Forms of Energy Flashcards

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1
Q

What is energy?

A

Energy is the ability to do work or move and motion

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2
Q

What is the possible or stored energy in an object called?

A

potential energy

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3
Q

How does potential energy become kinetic energy?

A

when the energy is put in moation

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4
Q

What is chemical energy?

A

Chemical energy is when the energy is stored in the bonds of atoms

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5
Q

How is all energy connected?

A

because it moves from one place to another

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5
Q

What is thermal energy?

A

heat

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6
Q

Which of the following is an example of kinetic energy?
a vase sitting on a table
Sound
a plate of hot food
a parked cars

A

sound

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7
Q

What is an example of radiant energy?

A

the sun

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8
Q

What is sound energy?

A

vibrations of matter

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8
Q

What is mechanical energy?

A

energy used or stored in gears or moving parts

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9
Q

What does it mean “to do work?”

A

Exters a force over a distance to move an object

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10
Q

What unit is energy measured in?

A

joules (j)

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11
Q

How do objects gain energy?

A

Objects gain energy by work being done

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12
Q

What can the benefits be?

A

Monetary and non-monetary

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13
Q

What is CBA most commonly used for?

A

public decisions

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14
Q

What is a Trade-Off?

A

something you have given up

15
Q

What are examples of potential energy and describe them? 3

A

Chemical: stored energy in the bond of atoms:
For example, anything that burns
Nuclear: in the nucleus of an atom
Fusion: joining of atoms
Fission: spiting of atoms
Gravitational: stored based on the distance from the center of gravity
Mechanical: also known as elastic
An example is the spring of a trampoline

16
Q

What are examples of Kinetic energy and describe them?

A

Motion: any moving object
Example: moving fan
Sound a wave that is produced through the vibrations of an object
Electromagnetic radiation: moving waves in the form of radiation/light
Electric: movements of electrons of an atom

16
Q

What is cost-benefit Analysis?

A

Benefit-cost Anayylis how much do you benefit vs. the cost

17
Q

Be able to identify the opportunity cost in a scenario. Max can choose chipotle or subway he chooses subway what is the cost

A

chipotle

17
Q

What is Opportunity Cost?

A

An opportunity cost is when you give up an opportunity

18
Q

How does the amount of thermal energy change with temperature?

A

The amount of thermal energy changes with temperature whether it decreases or increases with the temperature.

19
Q

What is the difference between static and current electricity?

A

Static energy is stored and current energy is moving

20
Q

What element provides fuel for a nuclear reactor?

A

uranium

21
Q

What two particles are found in atomic nuclei?

A

proton and neutron

22
Q

What is an example of a form of energy vital to living things’ survival and why?

A

Mechanical energy is survival for living things because we need to beagle to move our hands, and eyelids to blink, open our mouths, and breathe.

23
Q

What are the products of a fission reaction?

A

Barium -141 Krypton -92

24
Q

How much radiation does the typical American receive annually from manmade sources such as medical procedures?

A

321 miilirems

25
Q

What is the range of a typical annual background for a person living in TN?

A

61-100 millirems

26
Q

What event causes a fission reaction to begin?

A

a u-235 atom captures in a neutron

27
Q

Electric Drill:
Input Energy

Useful Energy

Waste energy

A

Electrical
Mechanical
sound thermal

28
Q

Bunsen Burner:
Input Energy

Useful Energy

Waste energy

A

chemical
thermal
light

29
Q

Electric Drill
160W
Motion 90W
Sound 30W
Heat 40W

A

90/160=.5625 x100
56%

30
Q

Hair drier
180W
Heat 170W
Sound 10W

A

94%

31
Q

Mobile phone charger
1W
0.8W Electrical
0.2W Heat

A

80%

32
Q

Electric hob
1500W
Heat 1300W
Light 150W
Sound 50W

A

87%

33
Q

Electric hob
1500W
Heat 1300W
Light 150W
Sound 50

A

88%

34
Q

TV:
Input Energy

Useful Energy

Waste energy

A

Electrical
light sound
thermal

Science -8 (1 decks)

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