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# Unit d review

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### Unit d review

1. 1. Mr.Ilko
2. 2.  Know examples of the 6 different types; ◦ Levers – Class 1, 2, 3 ◦ Screw ◦ Wedge ◦ Ramp ◦ Wheel and Axel ◦ Pulley
3. 3.  Fulcrum in the middle, effort and load on the ends
4. 4.  Fulcrum on the end, load in the middle and effort on the other end
5. 5.  Fulcrum on the end, effort in the middle and load on the other end
6. 6.  Where more than one simple machine works together in order to perform a task
7. 7.  Have inter-connecting teeth that merge with other gears in order to turn Two or more gears working together creates a mechanical advantage through a gear ratio
8. 8.  An assembly of moving parts used to manage motion
9. 9.  Is the force that opposes motion Every device cannot have 100% efficiency because they will always have friction to deal with Friction requires energy to over come it
10. 10.  MA is calculated by dividing the output force by the input force MA = Output force Input force
11. 11.  Is calculated by dividing your input distance by your output distance SA = Input distance Output distance
12. 12.  Always written as a percentage A machine with 20% efficiency means 80% of its energy is lost to heat Efficiency is solved by dividing MA by SA and then multiplying by 100 Eff = MA x 100 SA
13. 13.  W = Force x Distance Work only occurs when the object moves
14. 14.  Hydraulics – use liquids in order to create pressure to lift objects Pneumatics – Use gas as a means to create pressure to lift objects