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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. Work is measured in units also known as?
Foot- pounds
2(pie)/pitch
Door knob.
In Horsepower.

2. The threads of a screw are cut so?
Work=Force*Distance
The force used to overcome friction is greater than the force used to do useful work.
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.

3. How can you figure out the mechanical advantage of most block and falls by glance?
Can change the direction of motion.
Power=Work/Time
Count the number of parts of the rope going to and from the movable block.
Feet.

4. What is the second thing a gear can do?
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.
32/8 = 4
Increase or decrease the the speed of the applied motion.

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

6. What type of lever provides a fractional mechanical advantage?
Direction - speed or size of the force applied.
Third class lever.
Shafts lying at any given angle.
Can change the direction of motion.

7. A miter gear connects what?
The force used to overcome friction is greater than the force used to do useful work.
Connects shafts having a 90 degree angle.
Foot- pounds
A screw and a spur gear.

8. What is the ratio of any gear train?
1
Length of ramp/length of height from floor to truck
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Third class lever.

9. Class two lever
fulcrum- weight- effort
Less than 1.
In Horsepower.
Door knob.

10. What is the formula for the mechanical advantage of a screw?
Feet.
2(pie)/pitch
Connects shafts having a 90 degree angle.
Increase or decrease the the speed of the applied motion.

11. What is another way to find the mechanical advantage of an inclined plane?
To magnify the applied force.
To raise a house or other heavy machinery.
Door knob.
Length of ramp/length of height from floor to truck

12. An egg beater has a mechanical advantage of what?
Door knob.
Less than 1.
Power=Work/Time
With oil - grease or soap.

13. What is the theoretical mechanical advantage of any gear train?
The force used to overcome friction is greater than the force used to do useful work.
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.
1

14. What is the formula for the wheel and axle?
Equals the weight of the object being hoisted.
In Horsepower.
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
Work=Force*Distance

15. What is an example of a third class lever?
Positive mechanical advantage.
your arm.
The rope that passes through your hands is greater than the distance that the load is raised.
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 first thing a gear can do?
A screw and a spur gear.
Can change the direction of motion.
A modification of an inclined plane.
Increase or decrease the the speed of the applied motion.

17. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
45
Direction - speed or size of the force applied.
2(pie)/pitch

18. What kind of machine is the inclined plane?
A modification of an inclined plane.
Simple machine
With oil - grease or soap.
A few thousandths of an inch.

19. What is the power formula?
Power=Work/Time
Same.
Same.
Simple machine

20. What is another example of a wheel and axle?
Door knob.
Same.
Can change the direction of motion.
Simple machine

21. What is the lever formula?
A modification of an inclined plane.
Same.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Feet.

22. 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?
The rope that passes through your hands is greater than the distance that the load is raised.
32/8 = 4
Positive mechanical advantage.
fulcrum- weight- effort

23. How do you find the mechanical advantage?
Connects shafts having a 90 degree angle.
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
To raise a house or other heavy machinery.

24. What direction does the effort and resistance move in the second class levers?
Opposite.
Same.
32/8 = 4
Shafts lying at any given angle.

25. How can you decrease friction on flat surfaces?
To magnify the applied force.
Same.
With oil - grease or soap.
fulcrum- weight- effort

26. What is the work formula?
In Horsepower.
Work=Force*Distance
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Can change the direction of motion.

27. How is distance measured in work?
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.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

28. What are the 4 forces?
Equals the weight of the object being hoisted.
The change of the direction of the pull.
Gravity - Magnetism - Friction - Recoil
Direction - speed or size of the force applied.

29. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
Magnify or reduce the force which you apply.
Third class lever.
A modification of an inclined plane.

30. What kind of mechanical advantage does the first and second class lever provide?
Magnify or reduce the force which you apply.
Positive mechanical advantage.
Direction - speed or size of the force applied.
To magnify the applied force.

31. The miter gear faces are beveled at what angle?
45
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.
A modification of an inclined plane.

32. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Equals the weight of the object being hoisted.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Work=Force*Distance
Same.

33. What is the jack screw used for?
To raise a house or other heavy machinery.
Count the number of parts of the rope going to and from the movable block.
Opposite.
Third class lever.

34. With a single fixed sheave what is the only mechanical advantage?
Magnify or reduce the force which you apply.
Work=Force*Distance
32/8 = 4
The change of the direction of the pull.

35. What is the mechanical advantage for a single fixed block?
Power=Work/Time
1
To raise a house or other heavy machinery.
Same.

36. What are first and third class levers used for?
In Horsepower.
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
Direction - speed or size of the force applied.
To magnify the applied force.

37. What direction does the effort and resistance move in first class levers?
Increase or decrease the the speed of the applied motion.
2. Each half of the rope carries an equal amount of weight.
Opposite.
Connects shafts having a 90 degree angle.

38. Gears can do a job for you by changing what three things?
1
A modification of an inclined plane.
Count the number of parts of the rope going to and from the movable block.
Direction - speed or size of the force applied.

39. What is one type of second class lever?
2. Each half of the rope carries an equal amount of weight.
Third class lever.
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.

40. Fractional mechanical advantage
Two surfaces move against one another.
Mechanical disadvantage. Use more force than the force of the load you lift.
2(pie)/pitch
Connects shafts having a 90 degree angle.

41. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Positive mechanical advantage.
The rope that passes through your hands is greater than the distance that the load is raised.
A modification of an inclined plane.
To speed up the motion of resistence.

42. Formula for fractional mechanical disadvantage.
In pounds.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
45
The rope that passes through your hands is greater than the distance that the load is raised.

43. What does a micrometer measure?
Increase or decrease the the speed of the applied motion.
A few thousandths of an inch.
Direction - speed or size of the force applied.
2. Each half of the rope carries an equal amount of weight.

44. How is force measured in work?
Same.
In pounds.
Mechanical disadvantage. Use more force than the force of the load you lift.
Door knob.

45. How is work done?
The rope that passes through your hands is greater than the distance that the load is raised.
Door knob.
1
When a resistance is overcome by a force acting through a measurable distance.

46. hat is a screw?
Connects shafts having a 90 degree angle.
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.
fulcrum- weight- effort
A modification of an inclined plane.

47. The worm gear is a combination of what?
Shafts lying at any given angle.
A screw and a spur gear.
Two surfaces move against one another.
Connects shafts having a 90 degree angle.

48. Friction is involved when?
Two surfaces move against one another.
Less than 1.
A modification of an inclined plane.
Work=Force*Distance

49. How do you measure power?
A screw and a spur gear.
A few thousandths of an inch.
your arm.
In Horsepower.

50. The bevel gear is used to connect what?
A screw and a spur gear.
With oil - grease or soap.
Same.
Shafts lying at any given angle.