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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. The threads of a screw are cut so?
Shafts lying at any given angle.
The force used to overcome friction is greater than the force used to do useful work.
Two surfaces move against one another.
1

2. An egg beater has a mechanical advantage of what?
Foot- pounds
fulcrum- weight- effort
Less than 1.
The force used to overcome friction is greater than the force used to do useful work.

3. What is the power formula?
2(pie)/pitch
Power=Work/Time
The force used to overcome friction is greater than the force used to do useful work.
Mechanical disadvantage. Use more force than the force of the load you lift.

4. What direction does the effort and resistance move in third class levers.
Increase or decrease the the speed of the applied motion.
Same.
In Horsepower.
To magnify the applied force.

5. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
Mechanical disadvantage. Use more force than the force of the load you lift.
A few thousandths of an inch.
fulcrum- weight- effort

6. The miter gear faces are beveled at what angle?
Mechanical disadvantage. Use more force than the force of the load you lift.
Positive mechanical advantage.
45
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

7. What is the first thing a gear can do?
Can change the direction of motion.
Same.
Equals the weight of the object being hoisted.
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

8. What is the lever formula?
Opposite.
Work=Force*Distance
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Positive mechanical advantage.

9. What is the theoretical mechanical advantage of any gear train?
Work=Force*Distance
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Third class lever.
2. Each half of the rope carries an equal amount of weight.

10. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
When a resistance is overcome by a force acting through a measurable distance.
Equals the weight of the object being hoisted.
A modification of an inclined plane.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

11. How do you measure power?
1
45
In Horsepower.
Increase or decrease the the speed of the applied motion.

12. What is an example of a third class lever?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Length of ramp/length of height from floor to truck
Positive mechanical advantage.
your arm.

13. What does a micrometer measure?
Mechanical disadvantage. Use more force than the force of the load you lift.
A few thousandths of an inch.
Feet.
1

14. The bevel gear is used to connect what?
2. Each half of the rope carries an equal amount of weight.
Shafts lying at any given angle.
Equals the weight of the object being hoisted.
The rope that passes through your hands is greater than the distance that the load is raised.

15. Gears can do a job for you by changing what three things?
Magnify or reduce the force which you apply.
Simple machine
Same.
Direction - speed or size of the force applied.

16. Fractional mechanical advantage
A few thousandths of an inch.
When a resistance is overcome by a force acting through a measurable distance.
Count the number of parts of the rope going to and from the movable block.
Mechanical disadvantage. Use more force than the force of the load you lift.

17. How do you find the mechanical advantage?
Work=Force*Distance
Foot- pounds
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.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

18. What direction does the effort and resistance move in the second class levers?
Same.
The rope that passes through your hands is greater than the distance that the load is raised.
Power=Work/Time
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.

19. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
Feet.
A few thousandths of an inch.
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

20. A miter gear connects what?
The change of the direction of the pull.
Shafts lying at any given angle.
Connects shafts having a 90 degree angle.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

21. What is the formula for the mechanical advantage of a screw?
Power=Work/Time
Feet.
2(pie)/pitch
Equals the weight of the object being hoisted.

22. What are first and third class levers used for?
Positive mechanical advantage.
To magnify the applied force.
Increase or decrease the the speed of the applied motion.
your arm.

23. Work is measured in units also known as?
Count the number of parts of the rope going to and from the movable block.
Foot- pounds
Increase or decrease the the speed of the applied motion.
To speed up the motion of resistence.

24. What is another example of a wheel and axle?
Door knob.
Magnify or reduce the force which you apply.
Feet.
Connects shafts having a 90 degree angle.

25. What kind of mechanical advantage does the first and second class lever provide?
Count the number of parts of the rope going to and from the movable block.
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.
Positive mechanical advantage.

26. hat is a screw?
When a resistance is overcome by a force acting through a measurable distance.
A modification of an inclined plane.
Mechanical disadvantage. Use more force than the force of the load you lift.
Wheel and axle.

27. How is force measured in work?
2(pie)/pitch
To raise a house or other heavy machinery.
In pounds.
Length of ramp/length of height from floor to truck

28. The worm gear is a combination of what?
Door knob.
Less than 1.
45
A screw and a spur gear.

29. What is the third thing a gear can do?
Wheel and axle.
Foot- pounds
Magnify or reduce the force which you apply.
2(pie)/pitch

30. Class two lever
fulcrum- weight- effort
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Positive mechanical advantage.
In pounds.

31. What is the second thing a gear can do?
Can change the direction of motion.
fulcrum- weight- effort
Mechanical disadvantage. Use more force than the force of the load you lift.
Increase or decrease the the speed of the applied motion.

32. How is work done?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
When a resistance is overcome by a force acting through a measurable distance.
Equals the weight of the object being hoisted.
Mechanical disadvantage. Use more force than the force of the load you lift.

33. Formula for fractional mechanical disadvantage.
Feet.
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.
Simple machine

34. What is one type of second class lever?
Simple machine
In pounds.
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.

35. What is the purpose of a third class lever?
To speed up the motion of resistence.
Door knob.
fulcrum- weight- effort
Foot- pounds

36. What is the ratio of any gear train?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Opposite.
Positive mechanical advantage.
Same.

37. How is distance measured in work?
Feet.
Increase or decrease the the speed of the applied motion.
Count the number of parts of the rope going to and from the movable block.
Positive mechanical advantage.

38. What is the work formula?
32/8 = 4
Work=Force*Distance
Increase or decrease the the speed of the applied motion.
45

39. What is the mechanical advantage of a single movable block?
In Horsepower.
Equals the weight of the object being hoisted.
2. Each half of the rope carries an equal amount of weight.
A screw and a spur gear.

40. What type of lever provides a fractional mechanical advantage?
fulcrum- weight- effort
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Can change the direction of motion.
Third class lever.

41. How can you decrease friction on flat surfaces?
With oil - grease or soap.
A screw and a spur gear.
A modification of an inclined plane.
The change of the direction of the pull.

42. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
The rope that passes through your hands is greater than the distance that the load is raised.
45
When a resistance is overcome by a force acting through a measurable distance.

43. What is the jack screw used for?
Less than 1.
To raise a house or other heavy machinery.
Mechanical disadvantage. Use more force than the force of the load you lift.
Opposite.

44. 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?
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.
The rope that passes through your hands is greater than the distance that the load is raised.
32/8 = 4

45. What kind of machine is the inclined plane?
Shafts lying at any given angle.
Third class lever.
Magnify or reduce the force which you apply.
Simple machine

46. What direction does the effort and resistance move in first class levers?
45
Mechanical disadvantage. Use more force than the force of the load you lift.
Opposite.
In pounds.

47. How can you figure out the mechanical advantage of most block and falls by glance?
To raise a house or other heavy machinery.
A screw and a spur gear.
Count the number of parts of the rope going to and from the movable block.
Connects shafts having a 90 degree angle.

48. Friction is involved when?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Simple machine
Two surfaces move against one another.
A few thousandths of an inch.

49. With a single fixed sheave what is the only mechanical advantage?
Magnify or reduce the force which you apply.
your arm.
A screw and a spur gear.
The change of the direction of the pull.

50. What is the mechanical advantage for a single fixed block?
To magnify the applied force.
1
Simple machine
With oil - grease or soap.