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physics > energy stores > Flashcards

energy stores Flashcards

1
Q

What is the unit of force?

A

Newton (N)

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2
Q

True or False: Energy can be created or destroyed.

A

False

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3
Q

What is the formula for calculating speed?

A

Speed = Distance / Time

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4
Q

Fill in the blank: The process of transferring heat through direct contact is called __________.

A

Conduction

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5
Q

What is the law of conservation of energy?

A

Energy cannot be created or destroyed, only transformed.

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6
Q

What is the unit of power?

A

Watt (W)

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7
Q

Which of the following is a scalar quantity? A) Force B) Velocity C) Speed D) Acceleration

A

C) Speed

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8
Q

What does the term ‘mass’ refer to?

A

The amount of matter in an object.

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9
Q

True or False: An object in motion will stay in motion unless acted upon by an external force.

A

True

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10
Q

What is the formula for calculating kinetic energy?

A

Kinetic Energy = 0.5 * mass * velocity^2

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11
Q

Fill in the blank: The resistance of a conductor is measured in __________.

A

Ohms

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12
Q

What is the principle of moments?

A

For an object in equilibrium, the sum of clockwise moments about a point equals the sum of anti-clockwise moments.

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13
Q

What is the effect of increasing temperature on the resistance of most conductors?

A

Resistance increases.

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14
Q

What is the formula for gravitational potential energy?

A

Gravitational Potential Energy = mass * gravitational field strength * height

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15
Q

Which type of wave requires a medium to travel through?

A

Mechanical wave

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16
Q

True or False: Electromagnetic waves do not require a medium.

A

True

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17
Q

What is the speed of light in a vacuum?

A

Approximately 299,792,458 meters per second

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18
Q

What is the definition of frequency?

A

The number of waves that pass a point in one second.

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19
Q

Fill in the blank: The force of attraction between two masses is called __________.

A

Gravity

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20
Q

What is a renewable energy source?

A

An energy source that is replenished naturally, such as solar or wind energy.

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21
Q

What is the formula for Ohm’s Law?

A

Voltage = Current * Resistance

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22
Q

Which of the following is not a form of energy? A) Thermal B) Mechanical C) Magnetic D) Time

A

D) Time

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23
Q

What is the term for the rate at which work is done?

A

Power

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24
Q

True or False: The higher the frequency, the lower the energy of a wave.

A

False

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25
Q

What is the definition of work done?

A

Work done = Force * Distance moved in the direction of the force.

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26
Q

Fill in the blank: The total energy in a closed system remains __________.

A

Constant

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27
Q

What is the SI unit of energy?

A

Joule (J)

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28
Q

What is an insulator?

A

A material that does not allow electric current to flow easily.

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29
Q

What occurs during a chemical reaction?

A

Atoms are rearranged to form new substances.

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30
Q

Which type of energy is stored in stretched or compressed objects?

A

Elastic potential energy

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31
Q

What is the definition of acceleration?

A

The rate of change of velocity per unit time.

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32
Q

Fill in the blank: The unit of pressure is __________.

A

Pascal (Pa)

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33
Q

What is the role of a fuse in an electrical circuit?

A

To protect the circuit from excessive current.

34
Q

True or False: Sound travels faster in air than in water.

A

False

35
Q

What is the main function of a transformer?

A

To change the voltage of an alternating current.

36
Q

What is the formula for calculating distance?

A

Distance = Speed * Time

37
Q

Which of the following is a vector quantity? A) Distance B) Speed C) Force D) Mass

A

C) Force

38
Q

What is the definition of a wave?

A

A disturbance that transfers energy from one place to another.

39
Q

Fill in the blank: The center of mass of an object is the point where its mass is __________.

A

Concentrated

40
Q

What happens to the total resistance in a series circuit when more resistors are added?

A

It increases.

41
Q

What is the unit of electric charge?

A

Coulomb (C)

42
Q

True or False: The frequency of a wave is inversely proportional to its wavelength.

A

True

43
Q

What is the definition of wavelength?

A

The distance between two consecutive points in phase on a wave.

44
Q

Fill in the blank: The energy transferred per unit charge is known as __________.

A

Voltage

45
Q

What is the purpose of a circuit breaker?

A

To automatically stop the flow of current in case of a fault.

46
Q

What is the definition of density?

A

Mass per unit volume.

47
Q

Fill in the blank: The boiling point of water is __________ degrees Celsius.

A

100

48
Q

What is the principle of conservation of momentum?

A

The total momentum of a closed system remains constant if no external forces act on it.

49
Q

True or False: A permanent magnet can lose its magnetism if heated.

A

True

50
Q

What is the formula for calculating pressure?

A

Pressure = Force / Area

51
Q

What is the definition of thermal energy?

A

The total kinetic energy of the particles in a substance.

52
Q

Fill in the blank: The process of changing from a liquid to a gas is called __________.

A

Evaporation

53
Q

What is a non-renewable energy source?

A

An energy source that cannot be replenished in a short time, such as fossil fuels.

54
Q

What is the role of an ammeter in a circuit?

A

To measure the current flowing through the circuit.

55
Q

Which of the following has the highest frequency? A) Radio waves B) Microwaves C) Visible light D) Gamma rays

A

D) Gamma rays

56
Q

What is the definition of equilibrium?

A

A state where all forces acting on an object are balanced.

57
Q

Fill in the blank: The temperature at which a solid becomes a liquid is called its __________.

A

Melting point

58
Q

What is the relationship between voltage, current, and resistance known as?

A

Ohm’s Law

59
Q

True or False: The amplitude of a wave is the maximum displacement from the rest position.

A

True

60
Q

What is the definition of work done in the context of physics?

A

Work done is the energy transferred when a force moves an object.

61
Q

What is the unit of frequency?

A

Hertz (Hz)

62
Q

Fill in the blank: The __________ is the point where the force of gravity acts on an object.

A

Center of mass

63
Q

What is a conductor?

A

A material that allows electric current to flow easily.

64
Q

What is the effect of doubling the speed of an object on its kinetic energy?

A

The kinetic energy increases by a factor of four.

65
Q

True or False: Light can be polarized.

A

True

66
Q

What is the definition of specific heat capacity?

A

The amount of heat required to raise the temperature of 1 kg of a substance by 1 degree Celsius.

67
Q

Fill in the blank: The __________ is the point in a mechanical system where the total torque is zero.

A

Equilibrium position

68
Q

What is the primary source of energy for the Earth?

A

The Sun

69
Q

What is the formula for calculating efficiency?

A

Efficiency = (Useful Energy Output / Total Energy Input) * 100%

70
Q

True or False: The higher the mass of an object, the greater its gravitational force.

A

True

71
Q

What is the definition of a thermal conductor?

A

A material that allows heat to pass through it easily.

72
Q

Fill in the blank: In a vacuum, all electromagnetic waves travel at the speed of __________.

A

Light

73
Q

What is the effect of increasing the area of a surface on pressure, given a constant force?

A

Pressure decreases.

74
Q

What is the unit of measurement for electric potential difference?

A

Volt (V)

75
Q

What is the definition of a longitudinal wave?

A

A wave in which the particle displacement is parallel to the direction of wave propagation.

76
Q

True or False: All waves transfer energy.

A

True

77
Q

What is the primary purpose of insulation in electrical wiring?

A

To prevent electric shock and short circuits.

78
Q

Fill in the blank: The process of changing from a gas to a liquid is called __________.

A

Condensation

79
Q

What is the principle of superposition?

A

When two or more waves overlap, the resultant displacement is the sum of the individual displacements.

80
Q

What is the definition of a transverse wave?

A

A wave in which the particle displacement is perpendicular to the direction of wave propagation.

81
Q

What happens to the temperature of a substance during a phase change?

A

The temperature remains constant.

82
Q

Fill in the blank: The __________ is the amount of space an object occupies.

A

Volume

physics (2 decks)

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