중1 Bella

너무 늦었습니다~

다음부터는 바로바로 올릴게요~^^

중1 소피아

이제서야 올리게 되네요. 즐거운 연휴 되세요~~~.

초 5 네이트

                         <Horrible Science #8. Fatal Forces>

1. Write the definition of Newton's laws of motion (all three), and the example of one of the three laws in real life. (see 19~21p)

1. If left alone a motionless object carries on moving in a straight line at a constant speed as long as another force doesn't make it change course.

2. A force makes an object change speed in the same direction as the force. The stronger the force the greater the change in speed. the less material in an object, the greater the change in speed.

3. When an object exerts a force on another the second object will push back just as hard.

2. How did gravity help in executions? Name three cases found in the book. (see 56~57p)

1. During a hanging the victim dropped through a trap door and gravity acting too far the force yanked their head off too.

2. Other gruesome method of execution was the guillotine. This featured a 30.4 kg weight attached to a sharp blade. The force powering the gruesome blade as it fell was gravity. In the 1790s working model guillotines were popular children's toys. Their must have been off their heads.

3. In England in the seventeenth century criminals who refused to plead guilty at their trials were crushed to death under heavy weights. Once again it was gravity doing the damage. I think they were poor.

3. According to the book, we have the weight of two elephants pressing our body. But we don't get crushed. Why? What happens if we aren't kept in the same pressure as ground level? (see 70p)

We don't get crushed because the air inside our body is under pressure too. It pushes outwards with the same force so we don't even notice it.

The lower the air pressure would cause air bubbles in his or her body to get bigger. The guts and lungs would swell painfully and the air bubbles trapped in fillings could make their teeth explode.

4. What is friction? Why is friction important, even though it causes lots of problems? (see 80p)

Friction make heat and sound as the energy of moving objects turns into heat and sound energy. Friction is important because without it wheels( in bike, car, etc) can't stop.

5. How does bolas work? Include 'centripetal force' in the explanation. (see 106~108p)

A bolas uses centripetal force for catching animals or people. It is two balls on a rope. You whirl the bolas above your head and let it go.

6. How did Archimedes pull the ship on the beach to the sea? (see

Archimedes made a machine. History doesn't record it looked looked like. But it must have been a series of pulleys the ship. Archimedes rolled up his sleeves and tugged on the rope and the ship slid smoothly down the beach.

벤자민 중1

벤자민은 자유학기제라 중간고사가 없어 아주 많이 한가함에도 불구하고

미션은 여전히 지각이네요ㅠㅠ

1년동안 1학기때 중간고사만 있을 뿐 정기적인 시험은 없답니다.

물론 간간히 단원평가와 수행평가가 있지만 중간 기말이 없어 이런 저런

체험이라는 명목하에 문화공연도 보고 직업체험이라해서 부모님이나 친척들 직장을

방문하기도 하는데 이게 뭐 별 효과도 없는 것 같아요. 아직 우리나라에서

부모님직장이나 아이들이 맘 놓고 견학할 수 있는 곳은 몇몇장소밖에 없는지라

그냥 쓰윽 돌아보는 정도인 것 같아요.

오히려 그냥 중간고사 시험치고 그냥 하던대로 하는게 더 좋은 것 같아요.

중간고사가 없으니 기말고사 범위도 장난이 아닐 것 같고 긴장감이 넘 없는 것 같아요~

Horrible Science #8. Fatal Forces

1. Write the definition of Newton's laws of motion (all three), and the example of one of the three laws in real life. (see 19~21p)

①       It left alone a motionless object doesn’t move. A moving object carries on moving in a straight line at a constant speed as long as another force doesn’t make it change course. For example, kicked ball will move forward as long as another force doesn’t make it change course

②       A force makes an object change speed in the same direction as the force. The stronger the force the greater the change in speed. The less material in an object, the greater the change in speed.

③       When an object exerts a force on another object the second object will push back just as hard.

2. How did gravity help in executions? Name three cases found in the book. (see 56~57p)

①       During the hanging the victim dropped through a trapdoor an gravity acting on the rope broke the victim’s neck. If the drop was too far the force yanked their head of too.

②       Another gruesome method of execution was the guillotine. This featured a 30.4 kg weight attached to a sharp blade. The force powering the gruesome blade as it fell was gravity.

③       In England in the seventeenth century criminals who refused to plead guilty or not guilty at their trials were crushed to death under heavy weights. Once again it was gravity doing the damage.

3. According to the book, we have the weight of two elephants pressing our body. But we don't get crushed. Why? What happens if we aren't kept in the same pressure as ground level? (see 70p)

 The air inside our body pushes outwards with the same force.

 The lower air pressure would cause air bubbles in the body to get bigger. The guts and lungs would swell painfully and air bubbles trapped in filling could make their teeth explode.

4. What is friction? Why is friction important, even though it causes lots of problems? (see 80p)

 Friction is the force that make things slow down and make sound and heat.

 Friction is important because if we don’t have friction, we can’t do almost things.

5. How does bolas work? Include 'centripetal force' in the explanation. (see 106~108p)

 A bolas uses centripetal force for catching animals or people. It’s two balls on a rope. You whirl the bolas above your head and let it go.

6. How did Archimedes pull the ship on the beach to the sea? (see 138~139p)

 He made a machine. But history doesn’t record what it look like. But it must have been a series of pulleys standing on wooden frames with the rope tied securely to the ship. And he tugged on the rope and the ship slid smoothly down the beach.

중1 Grace

셤기간이지만 구조현황보느라 tv앞에 앉은 아이를 말릴 수가 없네요. 요즘 너무 우울해요.ㅠㅠ

중1  소피아

우리 친구들 중간고사가 얼마 남지않아 다들 바쁠거 같아요,

소피아도 중간고사가 딱 1주일 남았네요.

모두들 중간고사 준비 잘해서 좋은 성과있길 바랍니다~