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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. 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.
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.
2(pie)/pitch

2. What is the power formula?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Mechanical disadvantage. Use more force than the force of the load you lift.
Power=Work/Time
Count the number of parts of the rope going to and from the movable block.

3. The threads of a screw are cut so?
Feet.
Gravity - Magnetism - Friction - Recoil
A modification of an inclined plane.
The force used to overcome friction is greater than the force used to do useful work.

4. How is work done?
To magnify the applied force.
Positive mechanical advantage.
When a resistance is overcome by a force acting through a measurable distance.
32/8 = 4

5. A miter gear connects what?
1
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Connects shafts having a 90 degree angle.
To magnify the applied force.

6. What is the formula for the mechanical advantage of a screw?
Shafts lying at any given angle.
Length of ramp/length of height from floor to truck
2(pie)/pitch
Mechanical disadvantage. Use more force than the force of the load you lift.

7. How can you figure out the mechanical advantage of most block and falls by glance?
In Horsepower.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Count the number of parts of the rope going to and from the movable block.
Equals the weight of the object being hoisted.

8. The worm gear is a combination of what?
Positive mechanical advantage.
Power=Work/Time
A screw and a spur gear.
To raise a house or other heavy machinery.

9. What is the work formula?
To magnify the applied force.
With oil - grease or soap.
Work=Force*Distance
Increase or decrease the the speed of the applied motion.

10. An egg beater has a mechanical advantage of 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.
Same.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Less than 1.

11. What direction does the effort and resistance move in first class levers?
your arm.
In Horsepower.
Opposite.
Simple machine

12. What are the 4 forces?
To speed up the motion of resistence.
Two surfaces move against one another.
Gravity - Magnetism - Friction - Recoil
In Horsepower.

13. Class two lever
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
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
Door knob.

14. Work is measured in units also known as?
Foot- pounds
Shafts lying at any given angle.
Feet.
Mechanical disadvantage. Use more force than the force of the load you lift.

15. What is the mechanical advantage of a single movable block?
Positive mechanical advantage.
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
2. Each half of the rope carries an equal amount of weight.
A few thousandths of an inch.

16. Formula for fractional mechanical disadvantage.
The change of the direction of the pull.
Less than 1.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A few thousandths of an inch.

17. What is an example of a third class lever?
Simple machine
Third class lever.
your arm.
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. How is distance measured in work?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Feet.
32/8 = 4
Simple machine

19. What is the ratio of any gear train?
Wheel and axle.
Two surfaces move against one another.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven 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

20. hat is a screw?
Mechanical disadvantage. Use more force than the force of the load you lift.
Can change the direction of motion.
In pounds.
A modification of an inclined plane.

21. Friction is involved when?
Direction - speed or size of the force applied.
Positive mechanical advantage.
Door knob.
Two surfaces move against one another.

22. What is the theoretical mechanical advantage of any gear train?
Mechanical disadvantage. Use more force than the force of the load you lift.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Door knob.
With oil - grease or soap.

23. What is the jack screw used for?
To raise a house or other heavy machinery.
Two surfaces move against one another.
With oil - grease or soap.
Length of ramp/length of height from floor to truck

24. What is the second thing a gear can do?
Shafts lying at any given angle.
Increase or decrease the the speed of the applied motion.
fulcrum- weight- effort
Power=Work/Time

25. What is another example of a wheel and axle?
Door knob.
Connects shafts having a 90 degree angle.
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

26. Gears can do a job for you by changing what three things?
fulcrum- weight- effort
Direction - speed or size of the force applied.
Shafts lying at any given 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.

27. What is the mechanical advantage for a single fixed block?
The rope that passes through your hands is greater than the distance that the load is raised.
Increase or decrease the the speed of the applied motion.
1
Opposite.

28. Fractional mechanical advantage
Feet.
Less than 1.
45
Mechanical disadvantage. Use more force than the force of the load you lift.

29. 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?
fulcrum- weight- effort
Feet.
32/8 = 4
The rope that passes through your hands is greater than the distance that the load is raised.

30. With a single fixed sheave what is the only mechanical advantage?
2. Each half of the rope carries an equal amount of weight.
The force used to overcome friction is greater than the force used to do useful work.
The change of the direction of the pull.
Can change the direction of motion.

31. What is the purpose of a third class lever?
Increase or decrease the the speed of the applied motion.
To speed up the motion of resistence.
Count the number of parts of the rope going to and from the movable block.
32/8 = 4

32. What is the third thing a gear can do?
Shafts lying at any given angle.
Magnify or reduce the force which you apply.
Opposite.
Third class lever.

33. 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.
Wheel and axle.
Gravity - Magnetism - Friction - Recoil
When a resistance is overcome by a force acting through a measurable distance.

34. The miter gear faces are beveled at what angle?
Direction - speed or size of the force applied.
In Horsepower.
45
The change of the direction of the pull.

35. 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.
Direction - speed or size of the force applied.
Length of ramp/length of height from floor to truck
To speed up the motion of resistence.

36. What kind of mechanical advantage does the first and second class lever provide?
To magnify the applied force.
1
Positive mechanical advantage.
To speed up the motion of resistence.

37. What are first and third class levers used for?
The rope that passes through your hands is greater than the distance that the load is raised.
To magnify the applied force.
Shafts lying at any given angle.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

38. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Work=Force*Distance
Foot- pounds
Connects shafts having a 90 degree angle.

39. What type of lever provides a fractional mechanical advantage?
Third class lever.
The rope that passes through your hands is greater than the distance that the load is raised.
Feet.
Count the number of parts of the rope going to and from the movable block.

40. How do you find the 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.
Less than 1.
Wheel and axle.
Length of ramp/length of height from floor to truck

41. What does a micrometer measure?
Foot- pounds
When a resistance is overcome by a force acting through a measurable distance.
Door knob.
A few thousandths of an inch.

42. What is the formula for the wheel and axle?
Positive 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.
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

43. How do you measure power?
In Horsepower.
Positive mechanical advantage.
Two surfaces move against one another.
Increase or decrease the the speed of the applied motion.

44. The bevel gear is used to connect what?
The force used to overcome friction is greater than the force used to do useful work.
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.

45. What direction does the effort and resistance move in the second class levers?
Equals the weight of the object being hoisted.
Same.
The force used to overcome friction is greater than the force used to do useful work.
Positive mechanical advantage.

46. What kind of machine is the inclined plane?
Shafts lying at any given angle.
45
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Simple machine

47. How is force measured in work?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
With oil - grease or soap.
Gravity - Magnetism - Friction - Recoil
In pounds.

48. What is the lever formula?
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.
Connects shafts having a 90 degree angle.
Gravity - Magnetism - Friction - Recoil

49. What is the first thing a gear can do?
To raise a house or other heavy machinery.
Can change the direction of motion.
Wheel and axle.
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.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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
Power=Work/Time
Same.