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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 power formula?
Less than 1.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Power=Work/Time
In Horsepower.

2. How do you measure power?
To raise a house or other heavy machinery.
In Horsepower.
In pounds.
Work=Force*Distance

3. Formula for fractional mechanical disadvantage.
With oil - grease or soap.
Magnify or reduce the force which you apply.
Can change the direction of motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

4. Fractional mechanical advantage
Feet.
Mechanical disadvantage. Use more force than the force of the load you lift.
In pounds.
45

5. Class two lever
Positive mechanical advantage.
Less than 1.
fulcrum- weight- effort
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.

6. What is the purpose of a third class lever?
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.
A modification of an inclined plane.
In Horsepower.
To speed up the motion of resistence.

7. What direction does the effort and resistance move in the second class levers?
Work=Force*Distance
Same.
A modification of an inclined plane.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

8. 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.
Same.
Feet.
32/8 = 4

9. How can you figure out the mechanical advantage of most block and falls by glance?
Count the number of parts of the rope going to and from the movable block.
Gravity - Magnetism - Friction - Recoil
A few thousandths of an inch.
45

10. What is the jack screw used for?
Third class lever.
2. Each half of the rope carries an equal amount of weight.
Direction - speed or size of the force applied.
To raise a house or other heavy machinery.

11. The bevel gear is used to connect what?
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.
Shafts lying at any given angle.
In Horsepower.

12. 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?
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
In Horsepower.
32/8 = 4
Increase or decrease the the speed of the applied motion.

13. What is an example of a third class lever?
Power=Work/Time
your arm.
The change of the direction of the pull.
To magnify the applied force.

14. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Increase or decrease the the speed of the applied motion.
Less than 1.
The rope that passes through your hands is greater than the distance that the load is raised.
To speed up the motion of resistence.

15. What is another way to find the mechanical advantage of an inclined plane?
Work=Force*Distance
Length of ramp/length of height from floor to truck
Count the number of parts of the rope going to and from the movable block.
A few thousandths of an inch.

16. Work is measured in units also known as?
2. Each half of the rope carries an equal amount of weight.
Door knob.
Foot- pounds
Same.

17. How can you decrease friction on flat surfaces?
Positive mechanical advantage.
To magnify the applied force.
With oil - grease or soap.
The force used to overcome friction is greater than the force used to do useful work.

18. What is one type of second class lever?
Length of ramp/length of height from floor to truck
Wheel and axle.
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.

19. A miter gear connects what?
Wheel and axle.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Connects shafts having a 90 degree angle.
Less than 1.

20. What does a micrometer measure?
The change of the direction of the pull.
Opposite.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A few thousandths of an inch.

21. What kind of mechanical advantage does the first and second class lever provide?
Foot- pounds
Positive mechanical advantage.
Increase or decrease the the speed of the applied motion.
Same.

22. What is the work formula?
To raise a house or other heavy machinery.
Positive mechanical advantage.
32/8 = 4
Work=Force*Distance

23. What is another example of a wheel and axle?
The force used to overcome friction is greater than the force used to do useful work.
Door knob.
Can change the direction of motion.
To raise a house or other heavy machinery.

24. What is the formula for the wheel and axle?
2. Each half of the rope carries an equal amount of weight.
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
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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.

25. 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.
1
The change of the direction of the pull.
Foot- pounds

26. What is the ratio of any gear train?
Same.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
fulcrum- weight- effort
Connects shafts having a 90 degree angle.

27. With a single fixed sheave what is the only mechanical advantage?
1
The change of the direction of the pull.
Power=Work/Time
fulcrum- weight- effort

28. The threads of a screw are cut so?
Foot- pounds
When a resistance is overcome by a force acting through a measurable distance.
The force used to overcome friction is greater than the force used to do useful work.
Direction - speed or size of the force applied.

29. An egg beater has a mechanical advantage of what?
In Horsepower.
Increase or decrease the the speed of the applied motion.
Connects shafts having a 90 degree angle.
Less than 1.

30. What direction does the effort and resistance move in first class levers?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Direction - speed or size of the force applied.
Opposite.
A few thousandths of an inch.

31. What is the formula for the mechanical advantage of a screw?
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.
2(pie)/pitch
A modification of an inclined plane.

32. What are first and third class levers used for?
To magnify the applied force.
Length of ramp/length of height from floor to truck
When a resistance is overcome by a force acting through a measurable distance.
1

33. What direction does the effort and resistance move in third class levers.
Simple machine
Same.
Connects shafts having a 90 degree angle.
Can change the direction of motion.

34. Friction is involved when?
Positive mechanical advantage.
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

35. What is the mechanical advantage of a single movable block?
When a resistance is overcome by a force acting through a measurable distance.
A modification of an inclined plane.
2. Each half of the rope carries an equal amount of weight.
In pounds.

36. Gears can do a job for you by changing what three things?
Two surfaces move against one another.
Equals the weight of the object being hoisted.
Direction - speed or size of the force applied.
32/8 = 4

37. The miter gear faces are beveled at what angle?
45
Third class lever.
Simple machine
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

38. What is the first thing a gear can do?
The rope that passes through your hands is greater than the distance that the load is raised.
Can change the direction of motion.
Door knob.
Positive mechanical advantage.

39. How is force measured in work?
Connects shafts having a 90 degree angle.
Can change the direction of motion.
A few thousandths of an inch.
In pounds.

40. hat is a screw?
Power=Work/Time
Feet.
A modification of an inclined plane.
To magnify the applied force.

41. What is the mechanical advantage for a single fixed block?
Foot- pounds
1
The change of the direction of the pull.
2. Each half of the rope carries an equal amount of weight.

42. 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=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(pie)/pitch
Less than 1.

43. What is the second thing a gear can do?
A screw and a spur gear.
To speed up the motion of resistence.
Increase or decrease the the speed of the applied motion.
Shafts lying at any given angle.

44. How do you find the mechanical advantage?
Feet.
Two surfaces move against one another.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
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.

45. What type of lever provides a fractional mechanical advantage?
Equals the weight of the object being hoisted.
32/8 = 4
Same.
Third class lever.

46. How is work done?
2(pie)/pitch
With oil - grease or soap.
When a resistance is overcome by a force acting through a measurable distance.
Same.

47. 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.
To raise a house or other heavy machinery.
Gravity - Magnetism - Friction - Recoil
your arm.

48. The worm gear is a combination of what?
A screw and a spur gear.
In Horsepower.
Door knob.
Opposite.

49. What are the 4 forces?
Work=Force*Distance
your arm.
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.
Gravity - Magnetism - Friction - Recoil

50. What kind of machine is the inclined plane?
32/8 = 4
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Simple machine
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.