Notes, summaries, assignments, exams, and exercises for Physics for Primary education

Literal and Figurative Language

A word or group of words can have different literal or figurative meanings depending on the situation in which they are used. In the literal sense, a word retains its usual meaning. In the figurative sense, its meaning does not correspond to the usual definition.

Rules for Compound Words

Compound words are formed by two or more simple words. Hyphenated compound words retain the accent of the words that form them if they carry it as simple words. Unscripted compound words follow general rules of accentuation. Compound words consisting of a verb and one or more pronouns also follow general rules of accentuation.

Understanding Adjectives and Their Degrees

Adjectives are words expressing qualities or states of the nouns...

Essential Requisites of an Orthodontic Spring

• 1. Simple to fabricate
• 2. Easy to adjust
• 3. Should fit into the available space
• 4. Easy to clean
• 5. Should apply force of required magnitude and direction
• 6. Should not slip or distort when placed over a sloping surface
• 7. Should remain active over a longer period of time

Mechanical Properties of Orthodontic Wire

• 1. Stress: It is defined as force per unit area.
• 2. Strain: Change in length per unit length.
• 3. Proportional Limit: It is defined as the greatest amount of stress where stress is proportional to strain.

Finger Spring for Mesial and Distal Movement

Indications and Material

• 1. Use: For mesial and distal movement which are in the line of the arch.
• 2. Material: Made of 0.5 mm stainless steel (s/s) wire.

Components

Fundamental Concepts of Energy and Work

• 1. Which of these is measured in joules? Energy
• 2. The two main types of energy discussed: Kinetic & Potential
• 3. The work-energy theorem: The net work done on an object equals the change in its kinetic energy.
• 4. Kinetic energy: The energy of movement.
• 5. The Law of Conservation of Energy: Energy can neither be created nor destroyed.
• 6. Potential energy: The energy of position.
• 7. Pendulum potential energy: Highest when at the top of its swing.
• 8. Inelastic collision: A collision where some energy is converted into other forms.
• 9. Chemical energy: Energy stored in chemical bonds.

Machines, Power, and Efficiency

• 6. Which machine has 100% efficiency? No real machine has 100% efficiency.
• 7. Rube Goldberg: Famous

Kepler's Laws of Planetary Motion

Johannes Kepler, utilizing the precise astronomical measurements made by Tycho Brahe—especially concerning the distance of Mars from the Sun—concluded that planetary trajectories are not circular but elliptical.

Kepler's First Law: The Law of Orbits

All planets move in elliptical orbits with the Sun located at one focus.

Kepler's Second Law: The Law of Areas

The radius vector connecting the Sun and a planet sweeps out areas that are directly proportional to the time interval spent.

Kepler's Third Law: The Law of Periods

The squares of the orbital periods ($T^{2}$) are directly proportional to the cubes of the semi-major axes ($a^{3}$) of the respective orbits.

Newton's Law of Universal Gravitation

Galileo came to...

Fundamental Physics Definitions

Properties of Matter and Energy

Electrical Charge

Property of matter related to the proportion existing between protons and electrons.

Energy

Capacity bodies have to produce changes in themselves and in other bodies.

Types of Energy

• Kinetic Energy (E_k): Possessed by bodies in motion: E_k = 1/2 * m * v²
• Potential Energy (E_p): Possessed by bodies due to the position they occupy in space or the deformation they are experiencing. E_p = m * g * h
• Gravitational Potential Energy: The energy of a body at a certain height above the surface.
• Elastic Potential Energy: Energy of an elastic body when it is deformed.
• Mechanical Energy: Possessed by bodies due to the velocity they have and their position in space.
• Electrical Energy: Produced

Permanent Magnet

: once magnetized, remains magnetized. Ferromagnet: easily magnetized (iron, nickel, cobalt, some rare-earth metals, magnetite). Paramagnet: magnetized with more difficulty. Diamagnet: repels magnetic fields (slightly) - “not magnetic”./Materials can be broken into smaller chunks, called “domains”. Each domain has a miniature magnetic field. Materials may look the same, but at a smaller level, domains could be different - hence why some are magnets (or magnetize easily) and some don’t. Material, Temperature, Condition, Size & Shape*, Distance, affects magnet strength. All magnets* have two poles; North and South. At poles magnet is at its strongest (repelling or attracting). Breaking a magnet turns into 2 smaller...

Electrical Fundamentals and Magnitudes

Key Electrical Magnitudes

• Voltage (V) / Potential Difference: Indicates the energy difference between two points in a circuit.
• Resistance (R): Indicates the opposition of a material to the passage of electric charge.
• Intensity (I) / Electric Current: Expresses the amount of electric charge that flows through a section of the circuit per second.
• Electrical Energy: Calculated as the product of the voltage supplied to the receiver, the intensity of the electric current flowing through it, and the time it is operating (E = V × I × t).
• Electric Power (P): Expresses the energy consumed by the receiver every second (P = V × I).

Direct Current (DC) vs. Alternating Current (AC)

Direct Current (DC)

DC flows consistently...

1. Scientist credited with the law of electromagnetic induction: Michael Faraday
2. Faraday's first discovery regarding electromagnetic induction: A changing current in one coil induces a current in another coil.
3. Factor influencing the induced EMF in a coil near a moving magnet: The speed at which the magnetic flux through the coil changes.
4. Physical quantity measuring the amount of magnetic field crossing a surface: Magnetic flux
5. Factor affecting magnetic flux through a surface: The angle between the surface and the magnetic field lines.
6. Phenomenon of electric current generation in a coil due to varying magnetic flux: Electromagnetic induction
7. Factor determining the induced EMF in a coil: The rate at which the magnetic flux through it changes.
8. Magnitude

Electrostatics and Resistance Solved Problems

Point of Zero Electric Field Intensity

Vicinity Equal to Zero:
Q₁ = -20 × 10^-6 C, Q₂ = +5 × 10^-6 C, r = 2 m
r₁ = (2 + x) m, r₂ = x m

The electric field intensity at P due to Q₁:

E₁ = (1 / 4πε₀) × (Q₁ / r₁²)
= (9 × 10⁹ × 20 × 10^-6) / (2 + x)²

The electric field intensity at P due to Q₂:

E₂ = (1 / 4πε₀) × (Q₂ / r₂²)
= (9 × 10⁹ × 5 × 10^-6) / x²

At P, E = 0, therefore E₁ = E₂:

(9 × 10⁹ × 20 × 10^-6) / (2 + x)² = (9 × 10⁹ × 5 × 10^-6) / x²

4 / (2 + x)² = 1 / x²

(2 / (2 + x))² = (1 / x)²

2x = 2 + x

x = 2 m

Electric Properties of a Uranium Nucleus

Uranium:
e = 1.6 × 10^-19 C, r = 10^-10 m

Q = 9.2e
= 9.2 × (1.6 × 10^-19 C)
= 14.72 × 10^-19 C

(i) Electric Field (E):
E = (1 / 4πε₀) × (Q / r²)
= (9 ×...

Wave Properties and Characteristics

1. Mechanical waves can travel in any type of medium.

2. Refraction occurs when the amplitude of a wave changes as it goes from one medium to another.

Wave Classification and Behavior

• Transverse waves move particles back and forth along the same direction in which the waves travel.
• Mechanical waves can travel either through matter or through empty space.
• The amount of diffraction depends on the size of the obstacle and the wavelength of the wave.

Multiple Choice Questions

Which of the following is NOT a medium through which a mechanical wave can travel?

Answer: b. vacuum

Sound waves do not travel through a(n) _____.

Answer: d. empty space

Sound waves are _____.

Answer: a. longitudinal

Which of the following is transferred