BTVN_Science_U1L1

What is the definition of the "Work " in science?

• The use of a force to move an object across a distance

• Pull or push something

• The use of hands to push a

  rock or a wall

• The use of force to turn an

  object into another thing.

Match the words to the correct pictures

• An axe

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• A lever

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• A pulley

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• A Wheel and axle

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• An Inclined plane

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What are simple machines?

• They just have one or two

  parts

• They have a lot of parts

• They have many wheels

  and very sharp

• They have another name

  complex machines

A​ ​ (a)   is made of a round object, a wheel, attached to a post, called an axle.

A ​ (b)   is a simple machine made from two slanted sides that end in a sharp edge.

A ​ (c)   is a stiff bar that rests on a support. A lever is used to lift and move things.

A ​ (d)   can make work easier in two ways. It can decrease the amount of force needed to move an object.

• wheel and axle
• Wedge
• lever
• pulley
• inclined plane

A crane offen uses a ..... to lift things off the ground.

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How many simple machines do you learn?

• 6

• 5

• 7

• 8

Name 6 simples machines that you learn

• A wheel axle, wedge, lever,

  inclined plane, pulley, and

  screw.

• A wheel axle, wedge, lever,

  inclined plane, washing

  machine, screw.

• A wheel axle, wedge, lever,

  inclined plane, washing

  machine, coffee machine.

• A fan, wedge, lever,

  inclined plane, washing

  machine, coffee machine.

What is the inclined plane?

You can choose many correct answers.

• is a slanted surface,

  it connects a lower level to a higher level.

• People use it to move an

  object over a longer

  distance.

• It can be used to hold

  things together and to raise and lower things.

• It can also change

  the direction that the force

  is applied

When you want to raise a flag on a pole, which simple machine would you use?

• A pulley

• A lever

• A wheel and axle

• A screw

Choose the correct answer:

A screw is ...

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