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Physics > Conservation of Energy > Flashcards

Conservation of Energy Flashcards

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1
Q

What are the eight main sources of energy?

A
  1. Magnetic
  2. Thermal
  3. Chemical
  4. Kinetic
  5. Electrostatic
  6. Elastic potential
  7. Gravitational potential
  8. Nuclear
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2
Q

What is Magnetic Energy?

A

The energy stored when repelling / attracting poles have been pushed closer together / further apart

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3
Q

What is internal (thermal) Energy?

A

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

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4
Q

What is Chemical Energy?

A

The energy stored in chemical bonds

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5
Q

What is Kinetic Energy?

A

The energy of a moving object.

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6
Q

What is Electrostatic Energy?

A

The energy stored when repelling / attracting charges have been moved closer together / pulled apart

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7
Q

What is Elastic Potential Energy?

A

The energy stored when an object is stretched or squashed.

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8
Q

What is gravitational potential Energy?

A

The energy of an object at height.

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9
Q

What is Nuclear Energy?

A

The energy stored in the nucleus of an atom.

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10
Q

What are the four main pathways?

A
  1. Mechanical Work
  2. Electrical Work
  3. Heating
  4. Radiation
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11
Q

What is Mechanical Work?

A

force moving an object through a distance

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12
Q

What is Electrical Work?

A

charges moving due to a potential difference

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13
Q

What is heating?

A

due to temperature difference caused electrically or by chemical reaction

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14
Q

What is radiation?

A

energy transferred as a wave

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15
Q

What is on the y axis and what’s is on the x axis of a distance time graph?

A

Distance is on the y axis
Time is on the x axis

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16
Q

What does Acceleration mean?

A

The rate of change in velocity

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17
Q

What is waste energy?

A

the energy that is not used by the device for its desired purpose

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18
Q

What is stopping distance?

A

The total distance a car travels from when the driver notices an obstruction to when the car stops.

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19
Q

What are 3 advantages of hydroelectricity?

A

It is renewable
Can increase or decrease energy output
It is cheap to run

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20
Q

For a light bulb what is the main ‘wasted’ energy output?

A

Heat Energy

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21
Q

What is the equation that summaries Newtons second law?

A

Force = mass x acceleration

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22
Q

What is work done?

A

the energy transfer that occurs when a force is used to move an object

23
Q

What does a distance time grape show?

A

How the distance travelled by an object is affected over time

24
Q

What is a non contact force?

A

a force which acts on an object without coming into contact with it

25
Q

What is the force that pushes back at an equal force?

A

Normal Contact Force

26
Q

What happens to the GPE of an object when it falls?

A

The gravitational potential energy of an object decreases when it falls

27
Q

What is braking distance?

A

the distance a car travels from when a driver applies the brakes and the car stops moving

28
Q

Is distance a scalar or vector quantity?

A

Scalar

29
Q

For a light bulb what is the ‘useful’ energy output?

A

Light energy

30
Q

What does Kinetic energy store mean?

A

The energy an object possesses due to a motion

31
Q

What does efficiency mean?

A

the measure of the proportion of energy that is transferred usefully

32
Q

What does magnetic energy store mean?

A

the energy stored when repelling magnetic poles are pushed closer together or pulled apart

33
Q

What are two components of stoping distance?

A

Thinking distance + Braking distance

34
Q

Is air resistant a contact or non contact force?

A

a contact force

35
Q

How is wind power generated?

A

By wind turbines that when spun creates energy

36
Q

Is friction a non contact or contact force?

A

contact force

37
Q

Is tension a contact or non contact force?

A

contact force

38
Q

What is wave power?

A

The water in the sea rises and falls because of waves on the surface this creates kinetic energy that drives electricity generators

39
Q

What energy transfer takes place when generating wind power?

A

Kinetic energy

40
Q

What is the difference between speed an velocity?

A

Speed is scalar
Velocity is a vector and only tells you the direction

41
Q

What is Newton’s first law?

A

A resultant force is required to change the motion of an object

42
Q

What is dissipated energy?

A

Energy that is lost in the surroundings

43
Q

What is a vector quantity?

A

have magnitude and direction

44
Q

Is magnetic force a contact or non contact force?

A

Non-Contact

45
Q

What are 3 types of fossil fuels and their states?

A

Coal (solid)
Crude oil (liquid)
natural gas (gas)

46
Q

What are 3 disadvantages of fossil fuels?

A

Limited resources
produce carbon dioxide
produce toxic gas when burned

47
Q

Is velocity a scalar or vector quantity?

A

Vector

48
Q

What are 2 advantages of nuclear energy?

A

Don’t produce any pollutants
Can be used in any conditions

49
Q

What is a scalar quantity?

A

only have magnitude

50
Q

What is a electrostatic store?

A

energy stored when repelling charges have been moved closer together or pulled apart

51
Q

What is the formula for velocity?

A

velocity = displacement / time

52
Q

What energy resource is most widely used to power vehicles?

A

Types of crude oil

53
Q

What are the units for kinetic energy?

A

Joules

54
Q

What is the conservation of energy law?

A

energy can be transferred but can never be created

Physics (7 decks)

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