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[12]Horrible Science #8. Fatal Force

±Û¾´ÀÌ sophie

µî·ÏÀÏ 2014-04-13 20:49

Á¶È¸¼ö 3,546

http://www.suksuk.co.kr/momboard/CAX_090/5927

Ä«Ä«¿ÀÅå Ä«Ä«¿À½ºÅ丮 ºí·Î±× ³×À̹ö¹êµå ÆäÀ̽ººÏ Æ®À§ÅÍ

H.S. #8.docx (12.37KB)

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Hello guys!

I think most of us have the mid-term exam within two or three weeks. Again..

I've survived through tests first and second year of middle school, but tests always makes me nervous. I'll get used to it some day...!(I hope)

 

Well, good luck on your tests everyone! And have a nice week!


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º°»ù 2014-05-23 08:52 

Áß1 Bella

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¹ÎÀ縶¹Ì 2014-05-06 23:18 

 

 

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pinkrose 2014-05-03 21:40 

Áß1 ¼ÒÇǾÆ

ÀÌÁ¦¼­¾ß ¿Ã¸®°Ô µÇ³×¿ä. Áñ°Å¿î ¿¬ÈÞ µÇ¼¼¿ä~~~.

Å丶Åä22 2014-04-28 17:22 

 

 

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¾Ë¾Ë¶°¶° 2014-04-27 22:02 

ÃÊ 5 ³×ÀÌÆ®



                         <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.



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¾Ë¾Ë¶°¶° 2014-04-27 22:07:40
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ÇöÀ͸¾ 2014-04-23 01:05 

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)

¨ç       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

¨è       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.

¨é       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)

¨ç       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.

¨è       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.

¨é       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.

Å丶Åä22 2014-04-28 17:42:41
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Å丶Åä22 2014-04-28 17:46:28
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Å丶Åä22 2014-04-28 17:46:34
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Grace¸¾ 2014-04-21 01:50 

Áß1 Grace

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Çູ¸¶¹Ì 2014-04-20 12:05 

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¹ÎÀ縶¹Ì 2014-04-14 03:04 
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