Completar frases Which words are missing?Versión en línea Complete the texts by filling in the missing words. por jasone Gomez Alegria 1 Earth center moving water move hamessed engine reduced pulls slow air ground driving upward contact gravity iron push against float attract surface repel magnetic water WATERRESISTANCE This is a force which acts in , it can objects down , reducing the affect of . AIRRESISTANCE This is a force which acts in the , it can slow objects down when they are against it . Or if could be used to an object along . PROPULSION : This can be any force , it may be a or pull , but it could be an which forces an object forward . FRICTION : This force acts on objects when they are in with a , such as the . It can be by ensuring both surfaces are smooth . UPTHRUST : This is an force which acts in , it acts on a object gravity , and is why certain objects . MAGNETS : They can some materials . They can also other objects . They are usually made from . They have two ends called poles GRAVITY : This force affects every object on . It is a force which everything to the of the earth .
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