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Mechanical Systems 3

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What is one type of second class lever?
fulcrum- weight- effort
Opposite.
Simple machine
Wheel and axle.

2. How is work done?
To magnify the applied force.
When a resistance is overcome by a force acting through a measurable distance.
Wheel and axle.
2(pie)/pitch

3. Fractional mechanical advantage
Foot- pounds
Mechanical disadvantage. Use more force than the force of the load you lift.
Less than 1.
Positive mechanical advantage.

4. What is the second thing a gear can do?
To magnify the applied force.
Increase or decrease the the speed of the applied motion.
2. Each half of the rope carries an equal amount of weight.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

5. What is the third thing a gear can do?
Work=Force*Distance
2(pie)/pitch
Magnify or reduce the force which you apply.
In Horsepower.

6. How do you find the mechanical advantage?
Feet.
Find the resistance weight and divide that by the effort you need to lift the weight. M.A=R/E - This rule applies to all machines.
Magnify or reduce the force which you apply.
A modification of an inclined plane.

7. What is an example of a third class lever?
your arm.
The force used to overcome friction is greater than the force used to do useful work.
fulcrum- weight- effort
Increase or decrease the the speed of the applied motion.

8. Belt drive Gear 1 has 32 teeth and gear 2 and 3 have 8 teeth - for 1 revolution that gear 1 makes how many revolutions do gears 2 and 3 make?
45
Simple machine
32/8 = 4
Mechanical disadvantage. Use more force than the force of the load you lift.

9. What is the jack screw used for?
your arm.
Work=Force*Distance
To raise a house or other heavy machinery.
Increase or decrease the the speed of the applied motion.

10. What does a micrometer measure?
A few thousandths of an inch.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Increase or decrease the the speed of the applied motion.
Gravity - Magnetism - Friction - Recoil

11. The bevel gear is used to connect what?
Simple machine
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Shafts lying at any given angle.
Magnify or reduce the force which you apply.

12. With a single fixed sheave what is the only mechanical advantage?
In Horsepower.
2. Each half of the rope carries an equal amount of weight.
The change of the direction of the pull.
2(pie)/pitch

13. What direction does the effort and resistance move in the second class levers?
45
Same.
The rope that passes through your hands is greater than the distance that the load is raised.
A modification of an inclined plane.

14. A miter gear connects what?
Can change the direction of motion.
Third class lever.
Connects shafts having a 90 degree angle.
Magnify or reduce the force which you apply.

15. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
Mechanical disadvantage. Use more force than the force of the load you lift.
Third class lever.
Less than 1.

16. What is the formula for the wheel and axle?
Third class lever.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
With oil - grease or soap.
L=radius of the circle where the handle turns/l=1/2 the width of the edge of the blade = R=force of resistance offered by the screw/E=effort applied by the handle

17. Friction is involved when?
Can change the direction of motion.
2. Each half of the rope carries an equal amount of weight.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Two surfaces move against one another.

18. What is the theoretical mechanical advantage of any gear train?
To raise a house or other heavy machinery.
Foot- pounds
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Magnify or reduce the force which you apply.

19. What kind of machine is the inclined plane?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Simple machine
32/8 = 4
Two surfaces move against one another.

20. What kind of mechanical advantage does the first and second class lever provide?
Same.
2(pie)/pitch
A modification of an inclined plane.
Positive mechanical advantage.

21. How can you figure out the mechanical advantage of most block and falls by glance?
Wheel and axle.
Count the number of parts of the rope going to and from the movable block.
Feet.
Find the resistance weight and divide that by the effort you need to lift the weight. M.A=R/E - This rule applies to all machines.

22. What is the purpose of a third class lever?
L=radius of the circle where the handle turns/l=1/2 the width of the edge of the blade = R=force of resistance offered by the screw/E=effort applied by the handle
To speed up the motion of resistence.
Power=Work/Time
Gravity - Magnetism - Friction - Recoil

23. The worm gear is a combination of what?
A modification of an inclined plane.
A screw and a spur gear.
32/8 = 4
Foot- pounds

24. How is distance measured in work?
Shafts lying at any given angle.
Mechanical disadvantage. Use more force than the force of the load you lift.
Feet.
Same.

25. What is the formula for the mechanical advantage of a screw?
Power=Work/Time
Same.
Door knob.
2(pie)/pitch

26. What are first and third class levers used for?
To magnify the applied force.
In Horsepower.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Length of ramp/length of height from floor to truck

27. What is the lever formula?
Work=Force*Distance
Same.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
The change of the direction of the pull.

28. Class two lever
Increase or decrease the the speed of the applied motion.
Length of ramp/length of height from floor to truck
L=radius of the circle where the handle turns/l=1/2 the width of the edge of the blade = R=force of resistance offered by the screw/E=effort applied by the handle
fulcrum- weight- effort

29. Gears can do a job for you by changing what three things?
Foot- pounds
Direction - speed or size of the force applied.
1
A modification of an inclined plane.

30. The threads of a screw are cut so?
Find the resistance weight and divide that by the effort you need to lift the weight. M.A=R/E - This rule applies to all machines.
Door knob.
The force used to overcome friction is greater than the force used to do useful work.
Can change the direction of motion.

31. How can you decrease friction on flat surfaces?
A modification of an inclined plane.
Direction - speed or size of the force applied.
To magnify the applied force.
With oil - grease or soap.

32. What is the ratio of any gear train?
Magnify or reduce the force which you apply.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
your arm.
Door knob.

33. What direction does the effort and resistance move in third class levers.
Same.
2. Each half of the rope carries an equal amount of weight.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Foot- pounds

34. Work is measured in units also known as?
Direction - speed or size of the force applied.
Less than 1.
Positive mechanical advantage.
Foot- pounds

35. How do you measure power?
In Horsepower.
2(pie)/pitch
Can change the direction of motion.
Find the resistance weight and divide that by the effort you need to lift the weight. M.A=R/E - This rule applies to all machines.

36. What is another way to find the mechanical advantage of an inclined plane?
Simple machine
Length of ramp/length of height from floor to truck
Less than 1.
A modification of an inclined plane.

37. What is another example of a wheel and axle?
Door knob.
Power=Work/Time
A screw and a spur gear.
Third class lever.

38. What is the first thing a gear can do?
Connects shafts having a 90 degree angle.
your arm.
Can change the direction of motion.
Magnify or reduce the force which you apply.

39. What is the mechanical advantage of a single movable block?
Foot- pounds
2. Each half of the rope carries an equal amount of weight.
Mechanical disadvantage. Use more force than the force of the load you lift.
With oil - grease or soap.

40. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Mechanical disadvantage. Use more force than the force of the load you lift.
The rope that passes through your hands is greater than the distance that the load is raised.
fulcrum- weight- effort
Equals the weight of the object being hoisted.

41. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Third class lever.
Two surfaces move against one another.
The force used to overcome friction is greater than the force used to do useful work.
Equals the weight of the object being hoisted.

42. Formula for fractional mechanical disadvantage.
fulcrum- weight- effort
Two surfaces move against one another.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
The change of the direction of the pull.

43. hat is a screw?
A modification of an inclined plane.
In pounds.
your arm.
Third class lever.

44. The miter gear faces are beveled at what angle?
Wheel and axle.
When a resistance is overcome by a force acting through a measurable distance.
With oil - grease or soap.
45

45. How is force measured in work?
2. Each half of the rope carries an equal amount of weight.
Count the number of parts of the rope going to and from the movable block.
In pounds.
L=radius of the circle where the handle turns/l=1/2 the width of the edge of the blade = R=force of resistance offered by the screw/E=effort applied by the handle

46. What is the mechanical advantage for a single fixed block?
In pounds.
1
Magnify or reduce the force which you apply.
32/8 = 4

47. What is the work formula?
Mechanical disadvantage. Use more force than the force of the load you lift.
Work=Force*Distance
The force used to overcome friction is greater than the force used to do useful work.
Can change the direction of motion.

48. What type of lever provides a fractional mechanical advantage?
Third class lever.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Opposite.
Length of ramp/length of height from floor to truck

49. What is the power formula?
fulcrum- weight- effort
To raise a house or other heavy machinery.
2(pie)/pitch
Power=Work/Time

50. What direction does the effort and resistance move in first class levers?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Opposite.
L=radius of the circle where the handle turns/l=1/2 the width of the edge of the blade = R=force of resistance offered by the screw/E=effort applied by the handle
Length of ramp/length of height from floor to truck