Daksh

Have you ever tried to skip rock across water? did it skip over the water and then sink? most rocks sink in water. look at this picture. this rock is floating. do you know why it can float? rocks can be used in many ways. you decide how a rock can be used by it's properties. some rocks make good building materials. rocks can be very strong. strong rock wear away slowly. usually rocks do not burn or rust. they do not get wet inside. all of these properties help to make many rocks useful as building materials. have you ever used a compass? like a compass, the rock shown at the right can help you find direction. it has a property that most rocks do not have. when it is held by a string it will turn and point north.

this person wants to know the moon changes. he has been drawing of it for many days. what do you think he will find out.

pretend you are in a spacecraft. you are traveling toward the earth. when you look out the window of the spacecraft,you see a blue planet. do you know why the earth looks blue? why do you think you need to know about the earth? the earth is an important object in space. when you know more about it,you will understand more about the planet on which we all live

this person is a mountain climbing. do you think it would be hard to climb to the top of these rocks? have you ever walked or climbed in the mountains? why do you think you are learning how to observe rocks? there are many different kinds of rocks. as you learn how to observe them you will understand more about their differents.

temperature quantitatively expresses the attribute of hotness or coldness. temperature is measured with a thermometer. it reflects the average kinetic energy of the vibrating colliding atoms making up a substances.

Sound is a wave or vibration that travels through three states of matter solid,liquid and gas and of it is somthing that can be heard but,have you wondered how does sound travel it's simple,it all starts with a mechanical movement like pouring hot chocolate in a mug clapping your hands or hitting a gong so,when you hit a gong there's a movement which causes some vibration in the molecules which in turn,causes other molcules around them to vibrate

Temperature is a measure of the average kinetic energy of the particles in an object or system.

Physical quantities are properties that can be measured and described by the laws of physics, such as length, mass, and time

A"resistance line' commonly refers to a level on a finacial chart where the price of an asset ecounters selling pressure and struggles to rise above it.

the term"1unit of electricity refers to the commercial unit of electrical energy consumption, equivalent to 1 kilowatt-hour (kWh).​ fomula 1unit=1kWh=1000W×3600s=3.6×106 Joules

electricity is the flow of electric charge through a conductor usually by moving electrons in one direction or alternating direction to produce energy.

🧲 What is a magnet?A magnet is an object that can attract materials like iron, nickel, and cobalt.

⚡ Magnetic poles:Every magnet has two poles —

• North pole (N)

• South pole (S)Opposite poles attract each other (N attracts S), and similar poles repel (N repels N, S repels S).

🌍 Magnetic field:The space around a magnet where it can pull or push magnetic materials is called its magnetic field.

💡 Types of magnets:

Mass and weight are related but not the same:

• Mass is the amount of matter in an object.

• It never changes.

• Measured in kilograms (kg).

• Weight is the force of gravity acting on that mass.

• It changes if gravity changes (like on the Moon).

Simple machines are basic mechanical devices that make work easier by altering the direction or magnitude of a force. The six classic simple machines are the lever, inclined plane, wedge, wheel and axle, pulley, and screw. More complex machines are often combinations of these simple tools.

1. Lever A lever is a rigid bar that pivots around a fixed point called a fulcrum. It amplifies or changes the direction of force, allowing you to lift or move heavy objects with less effort.

Example: A seesaw. The fulcrum is the center support. You push down on your side (effort) to lift your friend on the other end (load). 2. Inclined plane An inclined plane is simply a slanted, flat surface, like a ramp. It helps you move objects to a higher or lower level using less force over a longer distance than lifting the object straight up.

Example: A wheelchair ramp…

1) What is gravity?

An invisible force that pull you back on the earth.

2) Gravity pull on the moon.

An invisible force has so much to do with the way we live! ooops forgot to tell you that tides in the sea and oceans happen beacuse of the gravitational pull of the moon.

3) Gravity and mass

1..2..3.. by the way have you ever thought why a stone falls on the ground faster than a piece of paper that is because : the bigger the object mass, the more gravity it will have.

1. the milky way is the galaxy that contains our solar system.

2. it's barred spiral galaxy.

3. about 100,000 light years wide has 100 - 400 billion stars.

4. our solar system sits in the orion arm.

5. 27000 - light years from the center.

6. at the center is a supermassive black hole called sagittariun A*it has bulge,spiral arms,and a halo of stars and dark matter.