💡PHYSICS💡

Form 4
🧲Chapter 6 : Light and Optics

Creds to owners✨

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💡Fizik bersama Heera dan Hanis 💡

📡 Bab 3
3.1 - Hukum Kegravitian Semesta Newton

! Definisi Penting !

1⃣ Daya Graviti

👉 Dikenali sbgai daya semesta
👉 Mengapa ? Kerana daya graviti bertindak antara mana² dua jasad dalam alam semesta
👉 Daya graviti wujud secara berpasangan [ dua jasad ]
👉 Dua jasad tersebut mengalami daya graviti dengan magnitud yang samaa

💥 Berkadar terus dgn hasil darab jisim kuasa dua jasad
💥 Berkadar songsang dgn kuasa dua jarak di antara pusat jasad tersebut


2⃣ Hukum Kegravitian Semesta Newton.... menyatakan bahawa

🔍 daya graviti antara 2 jasad adalah berkadar terus dgn hasil darab jisim kedua² jasad
🔍 berkadar songsang dgn kuasa 2 jarak diantara pusat dua jasad tersebut


3⃣ Daya memusat (ms 90)

🌻Daya yang bertindak ke atas sebuah jasad dengan arah yang sentiasa menuju ke pusat bulatan itu
🌻Magnitud daya memusat bergantung kepada :
a) Jisim jasad
b) Halaju linear
c) Jejari bulatan

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💡Physics with Heera

! IMPORTANT DEFINITIONS !
Part 2

🔍Resistivity of a conductor, p
👉🏻Measure of a conductor's ability to oppose the flow of the electric current.

🔍Superconductors
👉🏻Materials that conduct electricity without any resistance.

🔍Critical temperature, Tc
The temperature when the resistivity of a superconductor becomes ZERO.

🔍Electromotive force (e.m.f.)
Energy transferred or work done by an electrical source to move one coulumb of charge in a complete circuit.

🔍Voltage drop
Value of potential difference across the circuit, V is SMALLER than the e.m.f. of the dry cell
V < e.m.f.

🔍Internal resistance, r of dry cell
The resistance caused by electrolytes in the dry cell
🧠Apa effects??
😿Loss of energy in the form of heat in dry cell
😿V < e.m.f. ---- (voltage drop👀)


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#heera

🦋*ੈ✩‧₊˚ 『 @serenenotes 』

FIZIKI SENARAI DEFINISI & FORMULA 2021.pdf

Physics Dictionary KSSM
FORM 4 & 5

🥰amazingPhysics🥰

💡Physics with Heera

4.1 Force on a Current-carrying Conductor in a Magnetic Field

🧲When a current-carrying conductor is placed in a magnetic field, the conductor will experience FORCE

🧲Direction of the force depends on :
🔋Direction of the current
🔋Direction of the magnetic field

🧲Force on a current-carrying conductor in a magnetic field is produced by?
👉The interaction between 2 magnetic fields
● magnetic field from the electric current in the conductor
●magnetic field from the permanent magnet

🫂The 2 magnetic fields combine to produce resultant magnetic field that is known as CATAPULT FIELD
🍁The PATTERN of the catapult field = direction of the force acting on the conductor

What is Catapult field? (Pg 138)

👉A resultant magnetic field produced by the interaction between the magnetic field from a current-carrying conductor and magnetic field from a permanent magnet

~ to be continued ~
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💡Fizik bersama Heera dan Hanis

4.1 - Daya ke atas konduktor pembawa arus dalam suatu medan magnet

🧲 Apabila konduktor pembawa arus diletakkan dalam suatu medan magnet, konduktor tersebut akan mengalami DAYA

🧲 Arah daya bergantung pada :
🔋 Arah arus
🔋 Arah medan magnet

🧲 Daya pada konduktor pembawa arus dalam medan terhasil daripada ?
👉 Interaksi di antara 2 medan magnet
● medan magnet drpd arus elektrik dalam konduktor
● medan magnet drpd magnet kekal

🫂 - 2 medan magnet ini bergabung utk menghasilkan 1 medan magnet paduan yg dikenali sbgai MEDAN LASTIK

🍁 CORAK medan lastik = arah tindakan daya pada konduktor itu

Apakah itu medan lastik ? (Pg 138)

👉 medan magnet paduan yg dihasilkan oleh interaksi antara medan magnet drpd konduktor pembawa arus dgn medan magnet drpd magnet kekal

~ bersambung ~

🪴English Version : https://t.me/serenenotes/365

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#heera

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💡Physics with Heera

📡Chapter 3 : Electricity

! IMPORTANT DEFINITIONS !
Part 1

🔎E.H.T
👉🏻Extra high tension

🔍Electric field
👉🏻The REGION around a charged particle where any charge in the region will experience an electric force.

🔍Electric field strength, E
👉🏻Electric force acting on a unit postive charge placed at a point.

🔍Current, I
👉🏻The rate of flow of charge, Q in a conductor

🔍Potential difference, V
👉🏻The work done, W in moving one coulumb of charge, Q from one point to another.
V = W/Q or
V = E/Q

🔍Resistance
👉🏻Ratio between potential difference, V and current, I.
R = V/I

🔍Rheostat
👉🏻Control the current flow

🔍s.w.g.
👉🏻Size wire gauge

#physics #c3 #f5
#heera

🦋*ੈ✩‧₊˚ 『 @serenenotes 』

💡Physics with Heera

! IMPORTANT DEFINITIONS !
Part 2

🔍Resistivity of a conductor, p
👉🏻Measure of a conductor's ability to oppose the flow of the electric current.

🔍Superconductors
👉🏻Materials that conduct electricity without any resistance.

🔍Critical temperature, Tc
The temperature when the resistivity of a superconductor becomes ZERO.

🔍Electromotive force (e.m.f.)
Energy transferred or work done by an electrical source to move one coulumb of charge in a complete circuit.

🔍Voltage drop
Value of potential difference across the circuit, V is SMALLER than the e.m.f. of the dry cell
V < e.m.f.

🔍Internal resistance, r of dry cell
The resistance caused by electrolytes in the dry cell
🧠Apa effects??
😿Loss of energy in the form of heat in dry cell
😿V < e.m.f. ---- (voltage drop👀)


#physics #c3 #f5
#heera

🦋*ੈ✩‧₊˚ 『 @serenenotes 』

💡Physics with Heera

📡Chapter 2 - Force and Motion I📡

1⃣Newton's 1st Law of Motion
👉🏻An object will remain at rest or move at uniform velocity unless acted upon by an external force

Inertia
👉🏻The tendency of an object to remain at rest or if moving, to continue its motion in a straight line at uniform velocity

2⃣Newton's 2nd Law of Motion
👉🏻The rate of change of momentum is directly proportional to the force
👉🏻Acts in the direction of the applied force
F= kma

3⃣Newton's 3rd Law of Motion
👉🏻For evert action, there is a reaction of equal magnitude, but in the opposite direction.

Impulse, J
👉🏻Change of momentum
J= mv - mu

Impulsive FORCE, F
👉🏻RATE of change of momentum
F= ( mv - mu ) / t

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💡Physics with Heera

🔭Principle of Conservation of MOMENTUM

🧲The total momentum BEFORE collision is EQUAL to the total momentum AFTER collision if no external force is acting on it.

Basically,
Before = After
(No external force)

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#heera

🦋*ੈ✩‧₊˚ 『 @serenenotes 』

💡Physics with Heera

📡Chapter 3 - Gravitation
3.1 Newton's Universal Law of Gravitation

Important Definitions !

1⃣ Gravitational Force

👉Known as Universal force
👉Why? It acts between any two bodies in the universe
👉Force of attraction between any two bodies
👉Gravitational force exists between 2 bodies
👉both bodies experience gravitational force of the same magnitude

💥Directly proportional to the product of the masses of the two bodies
💥Inversely proportional to the square of the distance between the centres of the two bodies


2⃣Newton's Universal Law of Gravitation.... states that

🔍 The gravitational force between two bodies is directly proportional to the product of the masses of both bodies
🔍Inversely proportional to the square of the distance between the centres of the two bodies


3⃣Centripetal Force (pg 90)

🌻A force acts on the body in a direction towards the centre of cirlce
🌻The magnitude of the centripetal force depends on the
a) Mass of the body
b) Linear speed
c) Radius of the circle

#physics #c3 #f4
#heera
🦋*ੈ✩‧₊˚ 『 @serenenotes 』

💡Physics with Heera

📡Chapter 3 - Gravitation
3.2 Kepler's Law

Important Definitions !

1⃣Kepler's 1st Law

🪐All planets move in elliptical orbits with the Sun🌞 at one focus
🪐Law of Orbits


2⃣Kepler's 2nd Law

👉A line that connects a planet to the Sun sweeps out equal areas in equal times
👉Law of Areas


3⃣Kepler's 3rd Law

⏳The square of the orbital period(T²) of any planet is directly proportional to the cube of the radius(r³) of its orbit
⏳Law of Periods


#physics #c3 #f4
#heera

🦋*ੈ✩‧₊˚ 『 @serenenotes 』