💡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

#physics #c2 #f4
#heera

🦋*ੈ✩‧₊˚ 『 @serenenotes 』

💡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)

#physics #c2 #f4
#heera

🦋*ੈ✩‧₊˚ 『 @serenenotes 』

PLAYLIST TINGKATAN 4
T4 Pengukuran:
https://www.youtube.com/playlist?list=PLSAMCIatlM1KqtHtPl_X8wN50ZZ5OEaem
T4 Daya dan Gerakan I:
https://www.youtube.com/playlist?list=PLSAMCIatlM1J-TUo8CRsxjtZ1oK8U_AOl
T4 Kegravitian:
https://www.youtube.com/playlist?list=PLSAMCIatlM1Jnl0JsH2k-3b8gS3Z8VEii
T4 Haba:
https://www.youtube.com/playlist?list=PLSAMCIatlM1LYqlGcQBm40bOmHR6FMz84

PLAYLIST TINGKATAN 5
T5 Daya dan Gerakan II:
https://www.youtube.com/playlist?list=PLSAMCIatlM1JFO90LA8Pd9_PpsqQl5EIs
T5 Tekanan:
https://www.youtube.com/playlist?list=PLSAMCIatlM1JHkchB7bnasc96d-qJrlJM
T5 Elektrik:
https://www.youtube.com/playlist?list=PLSAMCIatlM1IRrfB0TGW-LSaWQQynxvRQ
T5 Keelektromagnetan:
https://www.youtube.com/playlist?list=PLSAMCIatlM1LkRB1-hLvei1Fj2dqEfN8I
T5 Elektronik:
https://www.youtube.com/playlist?list=PLSAMCIatlM1IIBYrFl1wKjbpl5MwlDxcJ
T5 Fizik nuklear:
https://www.youtube.com/playlist?list=PLSAMCIatlM1LxnerLpVrYv_C4kbgI-Li3

All the best ✨

Countdown SPM:
100 days left!

‘No matter how hard the things are, dont give up!’

💡Fizik bersama Heera dan Hanis

Bab 3 - Kegravitian
📡3.1 Hukum Kegravitian Newton

🌷Maksud² Penting
🧠mesti hafal ehh😉


#physics #c3 #f4
#heera
#malay

🦋*ੈ✩‧₊˚ 『 @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 』