Key Ideas :
Key Ideas Machines make work easier.
Machines can change the size, distance or direction of a force.
Mechanical advantage is the number of times a machine multiplies the effort force.
Six types of simple machines make work easier.
Machines lose efficiency to friction and heat.
Review :
Review Work happens when a force moves an object
W = f x d
Work is measured in Joules
(Newton x meters)
Power is the rate at which work is done
Power = work / time
Power is measured in Watts (Joules/second)
Slide 4:
A simple machine is a machine with few or no moving parts. Simple machines make work easier.
A compound machine is a machine with two or more simple machines working together to make work easier.
Compound Machines :
Compound Machines A bicycle is an example of a compound machine that uses a lever and wheel and axles.
Rube Goldberg :
Rube Goldberg an artist, inventor, engineer, sportswriter, and sculptor.
known for his comical drawings of crazy contraptions and inventions.
the term Rube Goldberg is used to signify anything done in an overly complicated or round-about manner.
Rube Goldberg Device :
Rube Goldberg Device