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Imagine humans when they first had fire, when they first made wheels, when they first established where they were going by looking at the stars.

Published on Aug 25, 2016

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1.

Imagine humans...

Photo by NASA Goddard Photo and Video
2.

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Photo by NASA Goddard Photo and Video
3.

How did...

Photo by NASA Goddard Photo and Video
4.

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Photo by NASA Goddard Photo and Video
5.

The answers all touch on physics and chemistry

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6.

Key scientific skills:
Independent inquiry
Habits of the mind
Objective observation
Wonder why
Make no assumptions
Pose explanations- Hypothesise

7.

work?

 
Photo by Vernon Barford School Library
8.

Work=force x distance TURN TO A NEIGHBOR AND TELL THEM WHAT YOU WANT WHEN YOU DO WORK

Photo by Heine Christiansen (Jr.)
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SIMPLE MACHINES

 
Photo by Vernon Barford School Library
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NAME THEM

Photo by NASA Johnson
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SIMPLE MACHINES

  • Incline plane
  • Screw
  • Wedge
  • Lever
  • Wheel-and-axel
  • Pulley
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VOCABULARY:

 
Photo by MartinJ-N
13.

Vocabulary

  • Force: Any push or pull
  • Joule:energy,heat,work
  • Newton: unit for force
  • Work: energy to move obj.
  • Simple Machine: fundamental part of any machine (6)
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How much work?

I apply 6N of force to push a box 4M= 24Nm
Photo by Biblioteca Rector Machado y Nuñez
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Mechanical Advantage= force applied/force applied with mechanical help

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A construction worker uses a board as a lever to lift a heavy rock. He applies 20N w/o lever & with lever he applies 10N of force

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What is the Mechanical advantage?

20 N/10N = 2
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Discuss what simple machines he used and the feasibility of Stonehenge or the ancient pyramids being built this way.

Dianne Zemanek