Tier 2 Flashcards

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1
Q

Principle of Conservation of Linear Momentum

A

The total linear momentum of an isolated system of interacting bodies before and after collision remains constant if no net external force acts on the system.

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2
Q

Photon

A

A discrete packet of energy of electromagnetic radiation.

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3
Q

Newton’s First Law of Motion

A

An object stays at rest or continues to move at constant velocity unless a resultant force acts on it.

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4
Q

Newton’s Second Law of Motion

A

Rate of change of momentum of a body is directly proportional to the resultant force acting on it and takes place in the direction of the resultant force.

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4
Q

Newton’s Third Law of Motion

A

When body A exerts a force on body B, body B exerts on body A a force of the same type, equal in magnitude but opposite in direction.

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5
Q

Internal energy of an ideal gas

A

The sum of the kinetic energy due to random motions by a distribution of particles and potential energy due to intermolecular forces between the particles. In an ideal gas, there is no intermolecular forces between particles, hence potential energy equals to zero and internal energy equals to kinetic energy only.

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5
Q

Electromotive force

A

The energy transformed from chemical to electrical per unit charge when a charge is driven round a circuit.

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5
Q

Simple harmonic motion

A

A type of oscillatory motion where the acceleration is directly proportional to displacement from the equilibrium position and directed opposite to displacement.

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6
Q

Newton’s Law of Gravitation

A

Gravitational force of attraction between two point masses is directly proportional to the product of the masses and inversely proportional to the square of separation between the masses.

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6
Q

Nuclear Fission

A

Splitting of a single heavy nucleus when bombarded by neutrons to form two or more light nuclei of approximately same mass with neutrons emitted.

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7
Q

Nuclear Fusion

A

Combining of two or more light nuclei under very high temperatures to form, a single more massive nucleus.

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8
Q

Half life

A

Time taken for the number of undecayed nuclei to be reduced to half of its original number.

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8
Q

Spontaneous process

A

Probability of decay is unaffected by external factors such as temperature, pressure or chemical composition.

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9
Q

Random process

A

Impossible to predict if an unstable nucleus will decay at any point in time, only probability of decay after a period of time is known.

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9
Q

Binding energy

A

The minimum energy required to completely separate the nucleons in a nucleus to infinity.

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9
Q

Threshold frequency

A

The minimum frequency of electromagnetic radiation to cause emission of electron from the surface of a metal.

9
Q

Rayleigh Criterion

A

The limit for which 2 sources of light can be just distinguished is when the first minimum of the diffraction pattern of one source coincides with the central maximum if the diffraction pattern of the other source.

10
Q

Polarized wave

A

In polarised waves, the oscillations are along one direction only, in a single plane that is normal to the direction of energy transfer of the wave.

11
Q

Transverse wave

A

Wave where the oscillations are normal to the direction of energy propagation.

12
Q

Condition of equilibrium

A

There is no resultant force acting on the body and there is no resultant torque about any point.

13
Q

Field of force

A

A region of space where a particle experiences a force.

14
Q

Vector

A

A physical quantity that has both magnitude and direction.

15
Q

Principle of moments

A

In rotational equilibrium, the sum of clockwise moment about any point is equal to the sum of anti-clockwise moment about the same point

16
Q

Hooke’s Law

A

The change in length of a material is directly proportional to the force applied on it, provided that the limit of proportionality is not exceeded.

17
Q

Inelastic collisions

A

Total kinetic energy of system of bodies after collision is less than before.

Relative speed of approach of object does not equal to relative speed of separation.