FORCES AND MAGNETISM 4TH GRADE

Can we see forces?

¿Podemos ver las fuerzas?

• yes

• no

• sometimes

• maybe

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Effects forces can have on things:

efectos que las fuerzas pueden tener en los objetos.

• break an object

• change its shape

• make it healthier

• not change

• start moving

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CONTACT FORCE

• move without touching

• move by touching

• opposite and equal in size

• not equal in size

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PUSH FORCES

• Crushing a can in your hands Aplastar una lata con las manos

• Kicking a soccer ball Dar una patada a un balón

• GRAVITY

• moving the school bag

  mover la mochila

• slowing down your dog

  hacer que tu perro vaya más despacio

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UNBALANCED FORCES

• Two equally strong girls tie in an arm wrestle Dos chicas igual de Fuertes echando un pulso

• Two teams tie in a tug of war competition Dos equipos compitiendo tirando de la cuerda

• Two forces are opposite and equal Dos fuerzas son opuestas e iguales

• make things move

  hacen que las cosas se muevan

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CONTACT FORCES

• GRAVITY

• Using a shopping cart in the supermarket Usar un carrito en el supermercado  

• MAGNETISM

• kicking a ball

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MAGNETISM

• NON CONTACT FORCE

• CONTACT FORCE

• PUSH AND PULL FORCE

• A FORCE THAT MAGNETS HAVE

• ONLY PULL FORCE

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MAGNETS CAN BE NATURAL OR MAN-MADE

• NATURAL

  MAGNETITA

• NATURAL

  IRON AND STEEL

• MAN-MADE

  IRON AND STEEL

• MAN-MADE

  MAGNETITA

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HOW DO MAGNETS WORK? ¿Cómo funcionan los imanes?

• THEY HAVE A MAGNETIC FIELD

• THEY ATTRACT OBJECTS MADE OF IRON OR STEEL

• THEY HAVE TWO POLES: NORTH AND SOUTH

• THEY ATTRACT OBJECTS MADE OF METAL

• SAME POLES REPEL AND DIFFERENT POLES ATTRACT

MAGNETIC

• BALL

• METAL SCISSORS

• BOOK

• KEY

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