Simple Machines

Simple machines make work easier.

Work is...

• energy from

  the sun

• what you do

  to make money

• a force that

  pulls you

  toward the earth

• when a force moves an object

  over a distance

Which of the following is

characteristic of a simple machine?

• they run on

  electricity

• they take a long time to make

• they are

  small in size

• they have few or no moving parts

Which of the following is NOT a simple machine?

• wedge

• spring

• inclined plane

• wheel & axle

What do you need to make a pulley?

• grooved wheel

  & rope

• 2 grooved wheels

  & rope

• 3 grooved wheels

  & rope

• all of the above

Pulleys make work easier by...

• holding things

  together

• cutting or

  splitting

  two objects

• making lifting

  easier

• moving objects forward

What do you need to make a screw?

• cylinder or cone

  with inclined plane

  wrapped around it

• cylinder or cone

  with inclined plane inside it

• cylinder and cone

  connected

  together

• cylinder and cone with inclined plane on top

Screws make work easier by...

• holding objects

  together

• cutting or splitting

  objects apart

• making lifting

  easier

• making objects

  move forward

What do you need to make a lever?

• sloped surface

• bar &

  fulcrum

• wheel &

  axle

• object that is wide on one side,

  pointed on the other

Levers make work easier by...

• holding objects

  together

• cutting or splitting

  an object

• making lifting

  easier

• moving an object

  forward

What do you need to make a wheel & axle?

• wheel with

  rubber tires

• wheel &

  wedge

• minimum

  4 wheels

• wheel &

  rod