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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. How is work done?
Shafts lying at any given angle.
2. Each half of the rope carries an equal amount of weight.
When a resistance is overcome by a force acting through a measurable distance.
A screw and a spur gear.

2. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
Positive mechanical advantage.
A modification of an inclined plane.
Foot- pounds

3. Gears can do a job for you by changing what three things?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
32/8 = 4
2(pie)/pitch
Direction - speed or size of the force applied.

4. Formula for fractional mechanical disadvantage.
1
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
When a resistance is overcome by a force acting through a measurable distance.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

5. What direction does the effort and resistance move in third class levers.
With oil - grease or soap.
Same.
Direction - speed or size of the force applied.
Door knob.

6. Class two lever
Feet.
fulcrum- weight- effort
1
your arm.

7. What is the jack screw used for?
To raise a house or other heavy machinery.
Magnify or reduce the force which you apply.
With oil - grease or soap.
fulcrum- weight- effort

8. How can you figure out the mechanical advantage of most block and falls by glance?
45
The rope that passes through your hands is greater than the distance that the load is raised.
To raise a house or other heavy machinery.
Count the number of parts of the rope going to and from the movable block.

9. 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
Same.
Gravity - Magnetism - Friction - Recoil
Third class lever.

10. What is the work formula?
Increase or decrease the the speed of the applied motion.
2. Each half of the rope carries an equal amount of weight.
Work=Force*Distance
To raise a house or other heavy machinery.

11. How is distance measured in work?
The rope that passes through your hands is greater than the distance that the load is raised.
Feet.
Foot- pounds
To magnify the applied force.

12. Friction is involved when?
Two surfaces move against one another.
1
Mechanical disadvantage. Use more force than the force of the load you lift.
A modification of an inclined plane.

13. What are first and third class levers used for?
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.
45
To magnify the applied force.

14. How do you find the mechanical advantage?
2. Each half of the rope carries an equal amount of weight.
To magnify the applied force.
Work=Force*Distance
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.

15. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
Positive mechanical advantage.
Gravity - Magnetism - Friction - Recoil
To speed up the motion of resistence.

16. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
Can change the direction of motion.
Simple machine
In Horsepower.

17. The bevel gear is used to connect what?
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.
2. Each half of the rope carries an equal amount of weight.
Shafts lying at any given angle.
Less than 1.

18. How do you measure power?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
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.
In Horsepower.
Gravity - Magnetism - Friction - Recoil

19. hat is a screw?
Work=Force*Distance
A modification of an inclined plane.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Length of ramp/length of height from floor to truck

20. What direction does the effort and resistance move in first class levers?
In Horsepower.
32/8 = 4
Opposite.
Less than 1.

21. What is the formula for the wheel and axle?
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
45
Length of ramp/length of height from floor to truck
In Horsepower.

22. How is force measured in work?
32/8 = 4
Wheel and axle.
Count the number of parts of the rope going to and from the movable block.
In pounds.

23. What is the second thing a gear can do?
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.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Equals the weight of the object being hoisted.

24. What is the theoretical mechanical advantage of any gear train?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Wheel and axle.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Work=Force*Distance

25. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
A few thousandths of an inch.
1
Equals the weight of the object being hoisted.
Magnify or reduce the force which you apply.

26. What is the ratio of any gear train?
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.
Magnify or reduce the force which you apply.
Connects shafts having a 90 degree angle.

27. What is another way to find the mechanical advantage of an inclined plane?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Length of ramp/length of height from floor to truck
your arm.
Count the number of parts of the rope going to and from the movable block.

28. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
Door knob.
Count the number of parts of the rope going to and from the movable block.
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.

29. What kind of machine is the inclined plane?
Simple machine
Increase or decrease the the speed of the applied motion.
Length of ramp/length of height from floor to truck
Feet.

30. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Two surfaces move against one another.
Same.

31. What does a micrometer measure?
To speed up the motion of resistence.
Power=Work/Time
A few thousandths of an inch.
When a resistance is overcome by a force acting through a measurable distance.

32. What is the mechanical advantage for a single fixed block?
A modification of an inclined plane.
Wheel and axle.
1
Length of ramp/length of height from floor to truck

33. What is the first thing a gear can do?
Can change the direction of motion.
your arm.
Count the number of parts of the rope going to and from the movable block.
In pounds.

34. With a single fixed sheave what is the only mechanical advantage?
The force used to overcome friction is greater than the force used to do useful work.
Same.
Power=Work/Time
The change of the direction of the pull.

35. What kind of mechanical advantage does the first and second class lever provide?
Wheel and axle.
Positive mechanical advantage.
fulcrum- weight- effort
In pounds.

36. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
The rope that passes through your hands is greater than the distance that the load is raised.
Shafts lying at any given angle.
Wheel and axle.
Feet.

37. A miter gear connects what?
your arm.
Door knob.
To magnify the applied force.
Connects shafts having a 90 degree angle.

38. Work is measured in units also known as?
Foot- pounds
In pounds.
Simple machine
In Horsepower.

39. How can you decrease friction on flat surfaces?
Equals the weight of the object being hoisted.
32/8 = 4
To raise a house or other heavy machinery.
With oil - grease or soap.

40. 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.
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.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

41. What is the power formula?
Connects shafts having a 90 degree angle.
Same.
Power=Work/Time
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

42. What is another example of a wheel and axle?
Door knob.
To magnify the applied force.
Can change the direction of motion.
32/8 = 4

43. What type of lever provides a fractional mechanical advantage?
1
Count the number of parts of the rope going to and from the movable block.
fulcrum- weight- effort
Third class lever.

44. The miter gear faces are beveled at what angle?
2(pie)/pitch
Equals the weight of the object being hoisted.
45
To speed up the motion of resistence.

45. What direction does the effort and resistance move in the second class levers?
Count the number of parts of the rope going to and from the movable block.
Same.
With oil - grease or soap.
A screw and a spur gear.

46. What is the purpose of a third class lever?
Power=Work/Time
To speed up the motion of resistence.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
45

47. What is one type of second class lever?
Increase or decrease the the speed of the applied motion.
Wheel and axle.
When a resistance is overcome by a force acting through a measurable distance.
Shafts lying at any given angle.

48. What is an example of a third class lever?
In Horsepower.
Length of ramp/length of height from floor to truck
your arm.
Direction - speed or size of the force applied.

49. The worm gear is a combination of what?
In pounds.
Foot- pounds
Increase or decrease the the speed of the applied motion.
A screw and a spur gear.

50. What are the 4 forces?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Gravity - Magnetism - Friction - Recoil
Third class lever.
Increase or decrease the the speed of the applied motion.