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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.
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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 formula for the wheel and axle?
A screw and a spur gear.
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
Two surfaces move against one another.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

2. How do you find the mechanical advantage?
Can change the direction of 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.
your arm.
Work=Force*Distance

3. 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.
Magnify or reduce the force which you apply.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Increase or decrease the the speed of the applied motion.

4. What is the purpose of a third class lever?
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.
To speed up the motion of resistence.
32/8 = 4

5. What is the power formula?
Power=Work/Time
The force used to overcome friction is greater than the force used to do useful work.
A screw and a spur gear.
32/8 = 4

6. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
2(pie)/pitch
2. Each half of the rope carries an equal amount of weight.
Feet.

7. The worm gear is a combination of what?
32/8 = 4
Feet.
A screw and a spur gear.
In Horsepower.

8. Formula for fractional mechanical disadvantage.
Shafts lying at any given angle.
Foot- pounds
A few thousandths of an inch.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

9. The bevel gear is used to connect what?
Less than 1.
Shafts lying at any given angle.
Direction - speed or size of the force applied.
In Horsepower.

10. 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.
Wheel and axle.
Opposite.
Simple machine

11. An egg beater has a mechanical advantage of what?
45
Length of ramp/length of height from floor to truck
1
Less than 1.

12. How is work done?
your arm.
Length of ramp/length of height from floor to truck
Same.
When a resistance is overcome by a force acting through a measurable distance.

13. The threads of a screw are cut so?
32/8 = 4
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.
Shafts lying at any given angle.

14. What does a micrometer measure?
Count the number of parts of the rope going to and from the movable block.
A few thousandths of an inch.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
45

15. Gears can do a job for you by changing what three things?
32/8 = 4
Positive mechanical advantage.
Direction - speed or size of the force applied.
Wheel and axle.

16. What type of lever provides a fractional mechanical advantage?
Third class lever.
To speed up the motion of resistence.
To magnify the applied force.
Less than 1.

17. Work is measured in units also known as?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Work=Force*Distance
Foot- pounds
Length of ramp/length of height from floor to truck

18. What is the first thing a gear can do?
When a resistance is overcome by a force acting through a measurable distance.
Same.
Can change the direction of motion.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

19. How is distance measured in work?
Feet.
To raise a house or other heavy machinery.
Gravity - Magnetism - Friction - Recoil
Count the number of parts of the rope going to and from the movable block.

20. What is the ratio of any gear train?
Two surfaces move against one another.
1
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.

21. What direction does the effort and resistance move in first class levers?
With oil - grease or soap.
1
Gravity - Magnetism - Friction - Recoil
Opposite.

22. The miter gear faces are beveled at what angle?
To magnify the applied force.
45
Increase or decrease the the speed of the applied motion.
Wheel and axle.

23. Class two lever
Shafts lying at any given 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.
A screw and a spur gear.
fulcrum- weight- effort

24. What is an example of a third class lever?
your arm.
Simple machine
Count the number of parts of the rope going to and from the movable block.
fulcrum- weight- effort

25. What is the jack screw used for?
Increase or decrease the the speed of the applied motion.
To raise a house or other heavy machinery.
A screw and a spur gear.
The force used to overcome friction is greater than the force used to do useful work.

26. 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?
In Horsepower.
32/8 = 4
Gravity - Magnetism - Friction - Recoil
2(pie)/pitch

27. What kind of machine is the inclined plane?
Feet.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Simple machine
Positive mechanical advantage.

28. What is the mechanical advantage of a single movable block?
With oil - grease or soap.
Direction - speed or size of the force applied.
Two surfaces move against one another.
2. Each half of the rope carries an equal amount of weight.

29. What kind of mechanical advantage does the first and second class lever provide?
Magnify or reduce the force which you apply.
Power=Work/Time
Wheel and axle.
Positive mechanical advantage.

30. How do you measure power?
Gravity - Magnetism - Friction - Recoil
Third class lever.
In Horsepower.
Mechanical disadvantage. Use more force than the force of the load you lift.

31. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
To raise a house or other heavy machinery.
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.
2. Each half of the rope carries an equal amount of weight.

32. What is the work formula?
Same.
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.
Work=Force*Distance

33. What direction does the effort and resistance move in the second class levers?
Same.
Gravity - Magnetism - Friction - Recoil
Two surfaces move against one another.
Foot- pounds

34. What is the mechanical advantage for a single fixed block?
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
1
Can change the direction of 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.

35. What is the formula for the mechanical advantage of a screw?
your arm.
Mechanical disadvantage. Use more force than the force of the load you lift.
2(pie)/pitch
Foot- pounds

36. What is another example of a wheel and axle?
To magnify the applied force.
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.
Door knob.

37. What are first and third class levers used for?
To magnify the applied force.
Equals the weight of the object being hoisted.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A screw and a spur gear.

38. Fractional mechanical advantage
When a resistance is overcome by a force acting through a measurable distance.
The change of the direction of the pull.
Mechanical disadvantage. Use more force than the force of the load you lift.
Opposite.

39. How can you figure out the mechanical advantage of most block and falls by glance?
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
your arm.
Count the number of parts of the rope going to and from the movable block.
Same.

40. What is the second thing a gear can do?
Magnify or reduce the force which you apply.
Third class lever.
Increase or decrease the the speed of the applied motion.
A screw and a spur gear.

41. How is force measured in work?
In pounds.
Can change the direction of motion.
45
1

42. With a single fixed sheave what is the only mechanical advantage?
Same.
The change of the direction of the pull.
45
A few thousandths of an inch.

43. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
Feet.
A few thousandths of an inch.
The rope that passes through your hands is greater than the distance that the load is raised.

44. What is the theoretical mechanical advantage of any gear train?
Equals the weight of the object being hoisted.
Foot- pounds
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
In Horsepower.

45. 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.
Door knob.
45
Wheel and axle.

46. What direction does the effort and resistance move in third class levers.
Wheel and axle.
Same.
Two surfaces move against one another.
Door knob.

47. How can you decrease friction on flat surfaces?
Mechanical disadvantage. Use more force than the force of the load you lift.
Shafts lying at any given angle.
Two surfaces move against one another.
With oil - grease or soap.

48. hat is a screw?
Equals the weight of the object being hoisted.
A modification of an inclined plane.
Mechanical disadvantage. Use more force than the force of the load you lift.
A screw and a spur gear.

49. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
To magnify the applied force.
Work=Force*Distance
The rope that passes through your hands is greater than the distance that the load is raised.

50. A miter gear connects what?
When a resistance is overcome by a force acting through a measurable distance.
Connects shafts having a 90 degree angle.
To magnify the applied force.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.