Cambridge Science Chapter 2mm

8/10/2019 Cambridge Science Chapter 2mm

1/15

CAMBRIDGE YEAR 6SCIENCE

CHAPTER 2: SCIENTISTS


2/15

2.1 SCIENTISTS

Science is the best way we have offinding out about the world.

Science does not have answer toeverything. Scientists discover newthings about the world and then explainthem to others.Scientists come from all over the worldand are both men and women.


3/15

2.1 SCIENTISTS

Scientificskills

Plan goodinvestigation

Make predictions

and explain why

Collect data

Make accurateobservations and

measurements

Learn from work

of otherscientists

Draw conclusions

Explain how datasupports your

prediction


4/15

2.2 ALHAZEN AND HOW WE SEE

An Iraqi scientist, Alhazen , explained howwe see things.

Alhazenworked

inside a darkroom with ahole in the

wall

Outside hehung

lanterns

He found hecould only

see things inthe roomwhen the

lantern lightshine on them

He concludedthat in order

for us to see,the light mustbe reflectedby objects

into the eyes


5/15

2.3 BENDING OF LIGHT

Alhazen also explained how light wasbent and use these idea to investigate

how lenses magnify objects.Phenomena caused by the bending oflight:(i)A stick half-immersed in water to

appear bent(ii)A deep pond appears shallower


6/15


A stick appears bent in water


7/15


A deep pond appears shallower


8/15

2.4 FASTER AND FASTER

Isambard Kingdom Brunel hatedwasting time. He wanted to go places

fast. He built the Great Western Railwayto speed up the journey between Londonand Bristol.

The journey between London to Bristol is190 km.


9/15

2.4 FASTER AND FASTER

Date Vehicle Time Km per hour

1784 Stagecoach 16 hours 11.88

1837 Improved stagecoach 11 hours 17.27

1851 First steam train 4.5 hours 42.22

1912 Fast train 2 hours 95

2003 Modern express 1.5 hours 126.67


10/15

2.5 YOU ARE A SCIENTIST

Mpemba and the ice creamMpemba was a thirteen-year-old school

student in Tanzania who made his ownice cream. As he made it, he noticed thatwarm water froze faster than cold.Mpemba discovery challengedscientists. They suggest severaltheories.


11/15


Theoriessuggested byscientists why

warm waterfreezes faster

than colderwater

Ice on top of thecold water insulatesthe water making it

freezes slower

Warm water evaporatesfaster than cold water

and so less warm wateravailable to freeze so it

freezes faster

Heating water removegases like oxygen

and carbon dioxidefrom the water

making it freeze faster


12/15


How do you imagine Albert Einstein?


13/15


Einstein made his greatest discoverywhen he was 14.

Einstein imagined what it would be like totravel at the speed of light.


14/15


Video on Albert Einstein:


15/15

Cambridge Science Chapter 2mm

Documents

Transcript of Cambridge Science Chapter 2mm