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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 work formula?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Foot- pounds
Work=Force*Distance
Simple machine

2. How do you find the mechanical advantage?
Wheel and axle.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
32/8 = 4
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.

3. What is another way to find the mechanical advantage of an inclined plane?
When a resistance is overcome by a force acting through a measurable distance.
2(pie)/pitch
To magnify the applied force.
Length of ramp/length of height from floor to truck

4. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Positive mechanical advantage.
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.
Count the number of parts of the rope going to and from the movable block.

5. Work is measured in units also known as?
To raise a house or other heavy machinery.
The rope that passes through your hands is greater than the distance that the load is raised.
Length of ramp/length of height from floor to truck
Foot- pounds

6. What direction does the effort and resistance move in the second class levers?
Same.
In pounds.
Magnify or reduce the force which you apply.
A modification of an inclined plane.

7. The worm gear is a combination of what?
To raise a house or other heavy machinery.
Third class lever.
A screw and a spur gear.
When a resistance is overcome by a force acting through a measurable distance.

8. The threads of a screw are cut so?
Equals the weight of the object being hoisted.
The force used to overcome friction is greater than the force used to do useful work.
A modification of an inclined plane.
In Horsepower.

9. What is an example of a third class lever?
1
2(pie)/pitch
your arm.
To raise a house or other heavy machinery.

10. What is one type of second class lever?
Same.
2(pie)/pitch
A screw and a spur gear.
Wheel and axle.

11. What is the mechanical advantage of a single movable block?
The rope that passes through your hands is greater than the distance that the load is raised.
2. Each half of the rope carries an equal amount of weight.
Two surfaces move against one another.
To raise a house or other heavy machinery.

12. What kind of mechanical advantage does the first and second class lever provide?
A few thousandths of an inch.
Positive mechanical advantage.
your arm.
Wheel and axle.

13. What is another example of a wheel and axle?
Direction - speed or size of the force applied.
Door knob.
Third class lever.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

14. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Shafts lying at any given angle.
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
Equals the weight of the object being hoisted.
2(pie)/pitch

15. What is the theoretical mechanical advantage of any gear train?
The rope that passes through your hands is greater than the distance that the load is raised.
Same.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

16. What is the mechanical advantage for a single fixed block?
1
Shafts lying at any given angle.
Feet.
Foot- pounds

17. What is the jack screw used for?
Gravity - Magnetism - Friction - Recoil
Less than 1.
To raise a house or other heavy machinery.
Can change the direction of motion.

18. The miter gear faces are beveled at what angle?
Power=Work/Time
Length of ramp/length of height from floor to truck
45
your arm.

19. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
Less than 1.
In Horsepower.
Equals the weight of the object being hoisted.

20. Gears can do a job for you by changing what three things?
Can change the direction of motion.
The rope that passes through your hands is greater than the distance that the load is raised.
Direction - speed or size of the force applied.
To raise a house or other heavy machinery.

21. The bevel gear is used to connect what?
Third class lever.
Direction - speed or size of the force applied.
Shafts lying at any given angle.
Door knob.

22. How is force measured in work?
In Horsepower.
32/8 = 4
In pounds.
Same.

23. What is the first thing a gear can do?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
1
Can change the direction of motion.

24. How is distance measured in work?
The rope that passes through your hands is greater than the distance that the load is raised.
To magnify the applied force.
Can change the direction of motion.
Feet.

25. What type of lever provides a fractional mechanical advantage?
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.
Two surfaces move against one another.
1

26. What kind of machine is the inclined plane?
Simple machine
Less than 1.
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.

27. What is the formula for the wheel and axle?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Same.
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.
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. Friction is involved when?
A screw and a spur gear.
With oil - grease or soap.
Two surfaces move against one another.
When a resistance is overcome by a force acting through a measurable distance.

29. What direction does the effort and resistance move in first class levers?
Same.
Opposite.
2. Each half of the rope carries an equal amount of weight.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

30. hat is a screw?
A modification of an inclined plane.
In Horsepower.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Increase or decrease the the speed of the applied motion.

31. What are first and third class levers used for?
Simple machine
To magnify the applied force.
Length of ramp/length of height from floor to truck
In Horsepower.

32. Fractional mechanical advantage
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.
32/8 = 4
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.

33. With a single fixed sheave what is the only mechanical advantage?
Same.
The change of the direction of the pull.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
In pounds.

34. How is work done?
To raise a house or other heavy machinery.
When a resistance is overcome by a force acting through a measurable distance.
2(pie)/pitch
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

35. What does a micrometer measure?
A few thousandths of an inch.
Increase or decrease the the speed of the applied motion.
Foot- pounds
Same.

36. What is the power formula?
Can change the direction of motion.
your arm.
A modification of an inclined plane.
Power=Work/Time

37. How can you decrease friction on flat surfaces?
Third class lever.
Connects shafts having a 90 degree angle.
A modification of an inclined plane.
With oil - grease or soap.

38. What is the purpose of a third class lever?
To raise a house or other heavy machinery.
To speed up the motion of resistence.
The force used to overcome friction is greater than the force used to do useful work.
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

39. Class two lever
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
fulcrum- weight- effort
In pounds.
Opposite.

40. How can you figure out the mechanical advantage of most block and falls by glance?
Door knob.
Count the number of parts of the rope going to and from the movable block.
The force used to overcome friction is greater than the force used to do useful work.
your arm.

41. How do you measure power?
your arm.
Door knob.
When a resistance is overcome by a force acting through a measurable distance.
In Horsepower.

42. An egg beater has a mechanical advantage of what?
Gravity - Magnetism - Friction - Recoil
Less than 1.
Shafts lying at any given angle.
When a resistance is overcome by a force acting through a measurable distance.

43. What is the second thing a gear can do?
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.
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.
Magnify or reduce the force which you apply.

44. What is the formula for the mechanical advantage of a screw?
2. Each half of the rope carries an equal amount of weight.
2(pie)/pitch
To raise a house or other heavy machinery.
Gravity - Magnetism - Friction - Recoil

45. What is the third thing a gear can do?
A modification of an inclined plane.
Less than 1.
45
Magnify or reduce the force which you apply.

46. 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?
Feet.
32/8 = 4
The force used to overcome friction is greater than the force used to do useful work.
Count the number of parts of the rope going to and from the movable block.

47. Formula for fractional mechanical disadvantage.
Same.
Count the number of parts of the rope going to and from the movable block.
fulcrum- weight- effort
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

48. What is the ratio of any gear train?
The change of the direction of the pull.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Same.
1

49. What is the lever formula?
To raise a house or other heavy machinery.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Increase or decrease the the speed of the applied motion.
Mechanical disadvantage. Use more force than the force of the load you lift.

50. What direction does the effort and resistance move in third class levers.
Same.
In pounds.
Opposite.
The rope that passes through your hands is greater than the distance that the load is raised.