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  • It's AumSum Time

  • Go Away.

  • Go Away.

  • Why don't you leave me alone?

  • That's because it's my brother, Shadow.

  • Whether we are standing out in the sun or next to a light source.

  • Our body does not let any light pass through us.

  • No.

  • No.

  • No.

  • So, what happens?

  • A dark patch forms in the area where the light does not reach.

  • The dark patch is called a shadow.

  • Why do things rust?

  • When iron comes in contact with oxygen and moisture.

  • It forms a reddish-brown compound called hydrated iron(III) oxide or rust.

  • This process of rusting eats up the iron and reduces its strength.

  • It can be represented by the following equation.

  • Iron plus oxygen plus water gives rust or hydrated iron(III) oxide.

  • Hi.

  • Today, I have an interesting challenge for you guys.

  • Take two books and interleave their pages like this.

  • Now, try to pull and separate the books.

  • Why can't we separate the books?

  • Due to the force of friction.

  • It acts opposite to the direction of motion.

  • So, when I pull or move the book in this direction, friction acts in the opposite direction.

  • This prevents the pages and books from separating.

  • Where's my key?

  • Where's my key?

  • Can't seem to find my key.

  • Awesome AumSum.

  • This guy over here is a magnet.

  • A magnet has the property to attract other objects made up of iron, cobalt or nickel.

  • Wanna see something?

  • So cool, right?

  • This area formed around the magnet is called a magnetic field.

  • Go Away.

  • Go Away.

  • Now, you're troubling the flower.

  • Buzzz…..

  • Buzzz….

  • Hold on.

  • I think the bee is helping it.

  • Some male flowers have pollen grains tightly packed in their anthers.

  • The bumble bee's buzzing creates vibrations.

  • These vibrations spew out the pollen grains all over the bee.

  • As the bee flies from flower to flower, some pollen grains fall onto the stigma of female flower.

  • This act of transferring pollen grains is called pollination.

  • Who's this guy?

  • Handsome Looks.

  • Great Personality.

  • It's Awesome AumSum.

  • I can see myself in the mirror because of reflection of light.

  • When light from our body falls on a shiny, polished surface like a mirror.

  • It changes the direction of light and reflects it back to our eyes, making us see ourselves in the mirror.

  • This change in the direction of light is called reflection of light.

  • That's north.

  • That's north.

  • I lied.

  • This is north.

  • How do I know?

  • Easy peasy.

  • Because of this magnet.

  • Place the magnet on a cork.

  • Then, keep the cork in a bowl of water.

  • Look.

  • The magnet is rotating.

  • When it stops, the north pole of the magnet points in the north direction.

  • So, our magnet acts like a magnetic compass, helping us with directions.

  • Save yourselves.

  • Save yourselves.

  • The sun is disappearing.

  • Relax.

  • It is getting dark because of the solar eclipse.

  • We get light from the sun.

  • Now, sometimes the sun, earth and moon come in a straight line with the moon in the middle.

  • So, the moon blocks the sun's light.

  • Thus, the shadow of the moon falls on some parts of the earth, causing darkness.

  • Now just wait and watch.

  • I'm coming.

  • I'm coming.

  • It's pointless.

  • No matter how hard I try, the great gravitational force will never let it happen.

  • We are all governed by an invisible force of attraction called gravitational force.

  • It helps us walk on the ground and ensures that what goes up, ultimately comes down.

  • Wicked nettle plant.

  • You injected methanoic acid into my skin.

  • Your neighbor, the dock plant contains basic chemicals.

  • It'll save me.

  • How?

  • When an acid and base react, they cancel the effect of one another and form salt and water.

  • This is called neutralization reaction.

  • Depending on the strength of the acid and the base, the resultant product is either neutral, acidic or basic.

  • Let's race.

  • Yeah.

  • I won.

  • How?

  • With displacement.

  • The actual path length traveled by a body is called distance.

  • While the shortest distance between the start and end-point is called displacement.

  • If moving along a straight line, both distance and displacement are equal, say 2 miles.

  • But if we return to the start-point, distance equals 4 miles, while displacement becomes 0.

  • Why?

  • Because the start and end-points are now the same.

  • C'mon.

  • Getting close.

  • Did I just use the first law of reflection?

  • Let's draw a perpendicular called normal.

  • This ray is the incident ray and this is the angle of incidence.

  • While, this is the reflected ray and the angle of reflection.

  • According to the first law of reflection, angle of reflection is always equal to angle of incidence.

  • It can be represented as angle i is equal to angle r.

It's AumSum Time

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B1 US magnet reflection angle displacement iron pollen

Shadow, Rust, Pollination, Magnetic Compass, Neutralization and much more!! | #aumsum

  • 11 0
    Amy.Lin posted on 2019/04/11
Video vocabulary