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Science > Energy > Flashcards

Energy Flashcards

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1
Q

What is energy?

A

Energy is essntal for everyone of us Energy help to do every thing .

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2
Q

How many type of Energy?

A

.Kinetic
.Heat
.Light
.Chemical
.Elastic Potential
.Gravitational Potential
.Electrostatic
.Magnetic
.Nuclear
.Internal (Thermal)

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3
Q

What is Kinetic Energy?

A

Kinetic is the energy of moving object and it depend on mass speed object.

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4
Q

What is Heat Energy?

A

Heat Energy flow from hot object from clod object.

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5
Q

What is Elastic Potentail Energy?

A

Elastic Potentail Energy is stored in stretched or squashed materail.

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6
Q

What is Gravitational Potential Energy?

A

Gravitational Potential Energy is the type of Energy on object stores due to its hieght above the ground.

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7
Q

What is Chemical Energy?

A

Chemical Energy is the energy stored in the bonds that connect atoms and molecule together.

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8
Q

What is sound energy?

A

Sound Energy is the energy stored in a sound waves.

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9
Q

What is light energy?

A

Light energy is a form of energy which our eye can detect.

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10
Q

What is electric energy?

A

Electric energy is also a form of energy assciated with moving charge.

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11
Q

What is magnetic energy?

A

The energy stored when repelling poles have been pushed closer together or when attracting poles have been pulled further.

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12
Q

What is internal (thermal) energy?

A

The total kinetic and potential energy of the particles in on object, in most cases this is the vibrations - also known as the kinetic energy - of particles. In hotter objects, the particles have more internal energy and vibrate faster.

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13
Q

What is electrostatic energy?

A

The energy stored when repelling charges have been moved closer together or when attracting charges have been pulled further apart.

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14
Q

What are three main equation?

A

1.Kinetic energy = 1/2 x mass x velocity squared.
Ke=1/2 x m x v squared.
2.Gravitational (potential) energy = mass x gravitational field strength x height.
Ep = m x g x h.
3.Elastic (potential) energy = 1/2 x forces x extension of the spring.
Ee = 1/2 x f x e.

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15
Q

Can energy be dissipation?

A

No system this is perfect. whenever there is a change in a system, energy is transferred and some of that energy is dissipated.

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16
Q

Who energy transfers?

A

Whenever a system changes there is a change in the way some or all of the energy is stored.

17
Q

What is four type of energy transfer?

A

1.Mechanical work
2.Elecrical work
3.Heating
4.Radiation

18
Q

What is mechanical work?

A

A force moving an object through a distance.

19
Q

What is electrical work?

A

Charges moving due to a potential difference.

20
Q

What is heating?

A

Due to temperature difference caused electrically or by chemical reaction.

21
Q

What is radiation?

A

Energy transferred as a wave, eg light and infrared - light radiation and infrared radiation are emitted from the sun.

22
Q

Where did energy come from?

A

In all cases, energy comes from one store and is transferred to another store.

23
Q

When did energy does present?

A

All the energy in the universe was present at the Big Bang.

24
Q

What is Big Bang?

A

The scientific theory that describes the early development of the Universe.

25
Q

Will energy stay or we will run out?

A

Energy will still be around at the very end of tine.

26
Q

Which energy does smartphone have?

A

All smartphones contain a battery stored chemical energy.

27
Q

What is conductor?

A

A material which allows charges to move easily through it.

28
Q

What is internal energy?

A

The total kinetic energy and potential energy of the particles in an object.

29
Q

What is radiation?

A

Energy transferred as wave spreading out from a source - eg light, infrared, sound.

30
Q

What is force?

A

Force is push or a pull.

31
Q

What is unit for force?

A

The unit of force is the newton (N)

32
Q

What is work?

A

Work is the measure of energy transfer when a force moves an object trough a distance.

33
Q

What is measuring unit for work done and energy?

A

Energy transferred and work done are both measured in joules (J).

34
Q

How to calculate work done?

A

1.The size of the force acting on the object.
2.The distance through which the force causes the body to move in the direction of the force.

35
Q

What is formula to find work done?

A

W=FXD this when:
1.Work done (W) is measured in joules (J).
2.Force (F) is measured in newtons (N).
3.distance (d) is in the same directions as the force and is measured in metres (m).

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