36072-Naturalscience03 Cam Unit06 Test

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actividades natural Sciencie McMillan 3º primaria
  6 UNIT Name: Class: 1 Natural Science Primary 3 ã Downloadable and printable © Ediciones Bilingües, S.L. 1 Tick (  ) the characteristics of simple and complex machines. 2 Identify the simple machines and their parts. Test Simple machinesComplex machines…use energy.…have few or no moving parts.…often need electrical energy.  …make work easier.…are made up of a number of machines. a. b. c. d. e. f. wheel and axle  6 UNIT 2 Natural Science Primary 3 ã Downloadable and printable © Ediciones Bilingües, S.L. 3 Change the incorrect word in each sentence.  pulley a  wedge screw pulley wheel and axle lever 4 Identify the simple machines in each picture. 5  Look at the photos. Do they show inventions from the industrial revolution  or the communication revolution ? 6  Read the descriptions and write the invention. a. A lever uses rope and a wheel to lift and lower heavy objects. b. A screw  can be used to cut objects. c. A pulley  can be used to move objects from one place to another. d. An wedge  is used to move objects up and down different levels. e. A inclined plane  uses a rigid bar and a fulcrum to lift objects. f. A wheel and axle  is used to hold things together. a. This invention sent tapped messages. b. This vehicle could travel about 40 kilometres in one hour. c. This was invented about 140 years ago and still helps people communicate today. d. This vehicle uses batteries and is better for the environment than a normal car. aa b cbcde
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