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### 9 Cards in this Set

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• Back
 What are the characteristics of interaction pairs? Equal in size Opposite in direction Act on different objects Explain how cars move, using terms about interaction pairs The tyres push backwards against the ground, the interaction pair is the ground pushing the car forward Explain how rockets move, using terms about interaction pairs Hot gas is pushed out of the base of the rocket, this leads to the rocket being pushed upwards, in the opposite direction What is the upwards force exerting by a surface called? Reaction Define resultant force The sum of all the forces adding together How do you calculate the average speed? Distance / Time Define Instantaneous speed Speed at a particular moment Explain how the police use radar guns to measure a vehicles speed The guns bounce microwave radiation off approaching cars, the guns then pick up the radiation and calculate the speed Define velocity The speed in a certain direction