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Natural Science · 4.º de Primaria · Ficha de repaso

Unit 5: We explore forces and machines

Forces and what they do, energy, simple and complex machines, and inventions.

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4.º de Primaria · Natural Science · Unit 5: We explore forces and machines · Ficha de repaso

Forces

A force is a push or a pull. A force can make an object move, stop, change direction or change shape.

gravity
pulls things down
friction
slows things down when they rub
magnetism
a magnet attracts objects made of iron

Energy

  • The Sun is our main source of energy: light and heat.
  • Moving things have kinetic energy.
  • Energy changes: a torch changes electrical energy into light.

Simple machines

MachineExample
levera see-saw
inclined planea ramp
pulleylifting a bucket from a well
wheel and axlethe wheels of a cart
screw · wedgea jar lid · an axe

Complex machines and inventions

Complex machines are made of several simple machines: a bicycle, a car, a crane. Inventions like the telephone changed the way we live.

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