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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 the jack screw used for?
To raise a house or other heavy machinery.
Direction - speed or size of the force applied.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
2. Each half of the rope carries an equal amount of weight.

2. What direction does the effort and resistance move in third class levers.
Third class lever.
Same.
Can change the direction of motion.
fulcrum- weight- effort

3. Work is measured in units also known as?
Positive mechanical advantage.
Foot- pounds
Can change the direction of motion.
The change of the direction of the pull.

4. What direction does the effort and resistance move in first class levers?
32/8 = 4
In pounds.
Opposite.
Count the number of parts of the rope going to and from the movable block.

5. What is the purpose of a third class lever?
In pounds.
Foot- pounds
To speed up the motion of resistence.
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.

6. What is the formula for the wheel and axle?
The rope that passes through your hands is greater than the distance that the load is raised.
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
Positive mechanical advantage.
Less than 1.

7. What kind of mechanical advantage does the first and second class lever provide?
2(pie)/pitch
Positive mechanical advantage.
Feet.
Less than 1.

8. What is the second thing a gear can do?
The rope that passes through your hands is greater than the distance that the load is raised.
Less than 1.
The force used to overcome friction is greater than the force used to do useful work.
Increase or decrease the the speed of the applied motion.

9. What does a micrometer measure?
Foot- pounds
A few thousandths of an inch.
Same.
Gravity - Magnetism - Friction - Recoil

10. What is the mechanical advantage for a single fixed block?
Direction - speed or size of the force applied.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
To speed up the motion of resistence.
1

11. Fractional mechanical advantage
Magnify or reduce the force which you apply.
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.
A modification of an inclined plane.

12. What are first and third class levers used for?
2(pie)/pitch
To magnify the applied force.
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
A modification of an inclined plane.

13. What is another example of a wheel and axle?
The change of the direction of the pull.
A screw and a spur gear.
To magnify the applied force.
Door knob.

14. How is distance measured in work?
With oil - grease or soap.
Feet.
Opposite.
Wheel and axle.

15. A miter gear connects what?
Magnify or reduce the force which you apply.
Mechanical disadvantage. Use more force than the force of the load you lift.
Connects shafts having a 90 degree angle.
2(pie)/pitch

16. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
32/8 = 4
2. Each half of the rope carries an equal amount of weight.
Equals the weight of the object being hoisted.
Shafts lying at any given angle.

17. What is the theoretical mechanical advantage of any gear train?
To speed up the motion of resistence.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
To magnify the applied force.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

18. What is the ratio of any gear train?
Shafts lying at any given angle.
Gravity - Magnetism - Friction - Recoil
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

19. 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?
32/8 = 4
Work=Force*Distance
In pounds.
Less than 1.

20. How can you decrease friction on flat surfaces?
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
Magnify or reduce the force which you apply.
With oil - grease or soap.
The force used to overcome friction is greater than the force used to do useful work.

21. What kind of machine is the inclined plane?
your arm.
A few thousandths of an inch.
Simple machine
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

22. Friction is involved when?
Opposite.
Two surfaces move against one another.
Third class lever.
To magnify the applied force.

23. With a single fixed sheave what is the only mechanical advantage?
To speed up the motion of resistence.
The change of the direction of the pull.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Wheel and axle.

24. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Gravity - Magnetism - Friction - Recoil
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
The rope that passes through your hands is greater than the distance that the load is raised.

25. The bevel gear is used to connect what?
Shafts lying at any given angle.
Foot- pounds
Less than 1.
To magnify the applied force.

26. What is the lever formula?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
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
Wheel and axle.
The force used to overcome friction is greater than the force used to do useful work.

27. What is the work formula?
Work=Force*Distance
1
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

28. Formula for fractional mechanical disadvantage.
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.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Count the number of parts of the rope going to and from the movable block.

29. How can you figure out the mechanical advantage of most block and falls by glance?
To magnify the applied force.
Magnify or reduce the force which you apply.
45
Count the number of parts of the rope going to and from the movable block.

30. How is work done?
Wheel and axle.
When a resistance is overcome by a force acting through a measurable distance.
2. Each half of the rope carries an equal amount of weight.
Less than 1.

31. How do you measure power?
In Horsepower.
Less than 1.
Shafts lying at any given angle.
Can change the direction of motion.

32. What is an example of a third class lever?
your arm.
Shafts lying at any given angle.
Door knob.
The force used to overcome friction is greater than the force used to do useful work.

33. The threads of a screw are cut so?
Mechanical disadvantage. Use more force than the force of the load you lift.
The force used to overcome friction is greater than the force used to do useful work.
A modification of an inclined plane.
Same.

34. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
When a resistance is overcome by a force acting through a measurable distance.
Can change the direction of motion.
Work=Force*Distance

35. What is the mechanical advantage of a single movable block?
Third class lever.
Simple machine
Positive mechanical advantage.
2. Each half of the rope carries an equal amount of weight.

36. An egg beater has a mechanical advantage of what?
Foot- pounds
Gravity - Magnetism - Friction - Recoil
1
Less than 1.

37. What is another way to find the mechanical advantage of an inclined plane?
2. Each half of the rope carries an equal amount of weight.
fulcrum- weight- effort
Direction - speed or size of the force applied.
Length of ramp/length of height from floor to truck

38. What is the third thing a gear can do?
Foot- pounds
A few thousandths of an inch.
Magnify or reduce the force which you apply.
With oil - grease or soap.

39. What is one type of second class lever?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
2. Each half of the rope carries an equal amount of weight.
Connects shafts having a 90 degree angle.
Wheel and axle.

40. How is force measured in work?
In pounds.
To speed up the motion of resistence.
2(pie)/pitch
Shafts lying at any given angle.

41. Gears can do a job for you by changing what three things?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Wheel and axle.
Direction - speed or size of the force applied.
The force used to overcome friction is greater than the force used to do useful work.

42. hat is a screw?
A modification of an inclined plane.
With oil - grease or soap.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Shafts lying at any given angle.

43. What direction does the effort and resistance move in the second class levers?
Less than 1.
Direction - speed or size of the force applied.
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.

44. How do you find the mechanical advantage?
Gravity - Magnetism - Friction - Recoil
Increase or decrease the the speed of the applied 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.
When a resistance is overcome by a force acting through a measurable distance.

45. What is the formula for the mechanical advantage of a screw?
Length of ramp/length of height from floor to truck
Power=Work/Time
2(pie)/pitch
Simple machine

46. Class two lever
Magnify or reduce the force which you apply.
Increase or decrease the the speed of the applied motion.
Work=Force*Distance
fulcrum- weight- effort

47. What type of lever provides a fractional mechanical advantage?
The force used to overcome friction is greater than the force used to do useful work.
The change of the direction of the pull.
Third class lever.
Same.

48. The worm gear is a combination of what?
To speed up the motion of resistence.
fulcrum- weight- effort
Feet.
A screw and a spur gear.

49. What is the first thing a gear can do?
Same.
A few thousandths of an inch.
The force used to overcome friction is greater than the force used to do useful work.
Can change the direction of motion.

50. The miter gear faces are beveled at what angle?
2(pie)/pitch
A screw and a spur gear.
Third class lever.
45