Have you ever rubbed your hands together when they get cold? Why do we do that? We do that for friction. Friction happens when two things that aren't very smooth rub together to make heat energy. The faster you rub two things together, the more friction (and heat) you can make. Let's discover friction!

WHAT YOU'LL NEED:

● Soap ● Water ● Your hands!

WHAT TO DO:

①Make sure your hands are dirty.

②Rub your hands together until you feel the heat of your hands.

③Now, use soap and water to get your hands very slippery(滑的).

④Try to make friction happen while your hands are slippery.

⑤Please write down what has happened.

LET'S TALK!

Friction is an energy that happens when two things tub together. When friction happens, it makes heat! When your hands are slippery, they won't make very much friction and your hands won't get so hot.

DID YOU KNOW?

● Friction happens when you stop your fast running bike.

● Ancient people made fires by rubbing two pieces of wood together. Friction happened though they didn't know it.

 

Friction is everywhere. Have you ever noticed situations where friction is happening? If not, ask your parents to take you out in a car. If it is not hot, touch the tires(轮胎) of the car before and after a short drive to see how much warmer they get from friction.

1.This text is most probably  .

A.a science report B.a car advertisement

C.a rubbing introduction D.a chemistry programme

2.You'd better make your hands   to get heat when you rub them.

A.slippery B.dry C.wet D.smooth

3.What does the word "friction" in this text mean in Chinese?

A.摩擦 B.冷却 C.膨胀 D.震动

4.   is not an example of friction.

A.Bike riding B.Car driving

C.Hands rubbing D.Friction discovering

5.What's the last column(栏目)?

A.THINK IT OVER! B.WHAT HAPPENED?

C.EVERYDAY ACTION D.WORK WITH PARENTS

I'm Leo. There is a great artist in my family. She is Lisa. Lisa likes drawing a lot. Here are her three drawings(图画).

There is an animal in the first drawing. It has two big eyes, a big mouth and two small ears. It has long arms and long legs. It is black and white. There are some apples in its hands. It looks very happy. What is it? I don't know, but Lisa says it is a panda.

There is a woman in the second drawing. She is thin. She has straight blonde hair, a small mouth, a big nose and two big eyes. She looks angry. Who is she? Lisa says she is our mom. But Mom has curly blonde hair, small eyes and a small nose.

There is an animal in the third drawing, too. Its head is an apple. Its hair and tail(尾巴)are leaves(树叶). It has a long mouth, and it is a banana. Its two legs are carrots. What is it? Lisa says it is a horse(马), but it doesn't look like a horse.

Lisa is really a great artist, isn't she?

1.The animal in the first drawing ______.

A.looks very happy

B.is eating apples

C.has big eyes and big ears

D.has short arms and short legs

2.Leo's mom has ______.

A.a big mouth

B.curly blonde hair

C.two big eyes

D.a big nose

3.From the passage, we can know Lisa is Leo's ______.

A.mother B.cousin

C.sister D.classmate

4.The underlined word “it” refers to(指代)“______”.

A.the hair B.the head

C.the tail D.the mouth

5.Which of the following is RIGHT?

A.Lisa's horse likes to eat carrots.

B.Lisa likes drawing very much.

C.Lisa draws an animal and two women.

D.The woman in the second drawing looks happy.

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