History of simple machines

Take a look at the video about simple machines (s.m) and answer

• How many parts has a simple machine got?
• What have humans created with s.m?
• What do s.m do?
• List the 6 main s.m.
• Which is the oldest s.m?
• Which is the most simple s.m.?
• How long have s.m.been being used?
• Why are simple machines called so?
• Who made the first simple machine? How old are they?
• How do we define and measure Work?
• Which s.m. is easiest to build?

Simple machines

Watch this film and answer

What is a simple machine? What is it used for?
Explain these simple machines and tell examples of them:

• Lever
• Pulley
• Inclined plane
• Wedge 

Studying motion

Watch the film and answer the questions

• What different types of movement do they tell you about?
• How do we know we are moving?
• Why do things move?
• Explain the different type of forces they tell you about
• Do forces exist over an object which stands still? What happens to them?
• Why would a tiny force cause a card's house to collapse?
• What happens if forces are unbalanced?
• Explain the two ways they ecplain for winning a tug-of-war
• What other factors affect the balance?