Activity 2.2.2a Mechanisms Review - Keatan whites digital ...



Activity 2.2.2a Mechanical Gears Review Read each question carefully and place your answer in the appropriate space.Examine the picture of the VEX model below and then answer the first three questions.Name the type of movement used as an input __reciprocating__________________________.The output movement has been changed to __increase, decrease______________ speed movement.We call this mechanism a ___rack and pinion____________________________.In the belt drive mechanism, what happens when the belt is crossed instead of open? moves in the opposite directionIn a mechanism, when the input goes from a small gear to an output which is a larger gear, the speed will ____decrease____________ (increase, decrease). When this happens, the amount of torque will _increase___________________ (increase, decrease).When a big gear turns a small one, the output provides more _speed__________ but less ____torque_____________ than the input.Which of the following mechanisms moved slower, the worm and wheel or the rack and pinion? _______worm and wheel______________________________Which mechanism transmits rotary motion to reciprocating? ___rack and pinion____________The advantage of using a chain drive over a belt drive is __belt drives are faster and carry more.______________________________________.The advantage of using a belt drive over a chain drive is _____ _speed________________________________________________________.The purpose of an idler gear is to ___spin in the same direction__________________.Use the formula below to determine the answers to questions 12 and 13.Distance moved by rack = number of input turns X pitch X number of teeth on the gearProblem: A rack with a pitch of 4 mm is used with a 20-tooth gear.How far will the rack move when the input is given one turn? _80mm_______________________ How many turns will be needed to move the rack a distance of 240 mm? ___3_____________ ................
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