All QuestionsAll Questions › Tag: Physics screw jack questionFilter:AllUnansweredSort byViewsAnswersVotesA screw jack with pitch 2mm is used to lift a load of 5000kg if the efficiency of the jack is90% ,calculate the frictional force that must be overcome if the tommy bar is 90cm.the load is lifted over a height over a height of 30cmBlossom asked 4 years ago • Secondary School892 views0 answers0 votes Read our disclaimer. AD: Take Free online baptism course: Preachi.com