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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. An egg beater has a mechanical advantage of what?
Less than 1.
Gravity - Magnetism - Friction - Recoil
Length of ramp/length of height from floor to truck
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.

2. How can you decrease friction on flat surfaces?
Simple machine
With oil - grease or soap.
32/8 = 4
2(pie)/pitch

3. What kind of machine is the inclined plane?
The rope that passes through your hands is greater than the distance that the load is raised.
Wheel and axle.
Simple machine
A screw and a spur gear.

4. What is the second thing a gear can do?
With oil - grease or soap.
Increase or decrease the the speed of the applied motion.
Gravity - Magnetism - Friction - Recoil
2. Each half of the rope carries an equal amount of weight.

5. What does a micrometer measure?
A few thousandths of an inch.
Same.
The force used to overcome friction is greater than the force used to do useful work.
Simple machine

6. What direction does the effort and resistance move in the second class levers?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
45
In pounds.
Same.

7. Class two lever
The rope that passes through your hands is greater than the distance that the load is raised.
1
fulcrum- weight- effort
Simple machine

8. What is an example of a third class lever?
your arm.
Count the number of parts of the rope going to and from the movable block.
Third class lever.
Work=Force*Distance

9. Friction is involved when?
32/8 = 4
Two surfaces move against one another.
In pounds.
2. Each half of the rope carries an equal amount of weight.

10. What is the mechanical advantage of a single movable block?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Two surfaces move against one another.
2. Each half of the rope carries an equal amount of weight.
Positive mechanical advantage.

11. What is the formula for the wheel and axle?
To speed up the motion of resistence.
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
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.

12. Work is measured in units also known as?
Feet.
The change of the direction of the pull.
Foot- pounds
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

13. 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.
45
Increase or decrease the the speed of the applied motion.
1

14. What type of lever provides a fractional mechanical advantage?
Third class lever.
45
In Horsepower.
The change of the direction of the pull.

15. How is work done?
Work=Force*Distance
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
In pounds.
When a resistance is overcome by a force acting through a measurable distance.

16. How can you figure out the mechanical advantage of most block and falls by glance?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
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.
Feet.

17. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Simple machine
The rope that passes through your hands is greater than the distance that the load is raised.
Less than 1.
In pounds.

18. What is the work formula?
your arm.
Work=Force*Distance
Simple machine
Mechanical disadvantage. Use more force than the force of the load you lift.

19. The bevel gear is used to connect what?
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
Shafts lying at any given angle.
A screw and a spur gear.
The force used to overcome friction is greater than the force used to do useful work.

20. The miter gear faces are beveled at what angle?
2(pie)/pitch
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.
45

21. What is another example of a wheel and axle?
Length of ramp/length of height from floor to truck
Door knob.
Gravity - Magnetism - Friction - Recoil
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

22. hat is a screw?
Foot- pounds
Work=Force*Distance
With oil - grease or soap.
A modification of an inclined plane.

23. How do you measure power?
In Horsepower.
Same.
A modification of an inclined plane.
To speed up the motion of resistence.

24. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Feet.
Equals the weight of the object being hoisted.
A modification of an inclined plane.
Opposite.

25. What is the mechanical advantage for a single fixed block?
1
Feet.
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
Count the number of parts of the rope going to and from the movable block.

26. What is the purpose of a third class lever?
45
fulcrum- weight- effort
To speed up the motion of resistence.
Same.

27. Formula for fractional mechanical disadvantage.
2. Each half of the rope carries an equal amount of weight.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Power=Work/Time
Same.

28. With a single fixed sheave what is the only mechanical advantage?
Equals the weight of the object being hoisted.
Less than 1.
fulcrum- weight- effort
The change of the direction of the pull.

29. What kind of mechanical advantage does the first and second class lever provide?
To raise a house or other heavy machinery.
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
Feet.
Positive mechanical advantage.

30. How do you find the mechanical advantage?
1
Direction - speed or size of the force applied.
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.
2(pie)/pitch

31. What is the power formula?
Direction - speed or size of the force applied.
Power=Work/Time
Count the number of parts of the rope going to and from the movable block.
The change of the direction of the pull.

32. 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 pounds.
2. Each half of the rope carries an equal amount of weight.
Two surfaces move against one another.
32/8 = 4

33. What direction does the effort and resistance move in third class levers.
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.
Increase or decrease the the speed of the applied motion.
Same.

34. Gears can do a job for you by changing what three things?
1
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Direction - speed or size of the force applied.
Wheel and axle.

35. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
your arm.
Foot- pounds
Magnify or reduce the force which you apply.

36. What are the 4 forces?
To magnify the applied force.
Gravity - Magnetism - Friction - Recoil
Simple machine
2. Each half of the rope carries an equal amount of weight.

37. A miter gear connects what?
Gravity - Magnetism - Friction - Recoil
To speed up the motion of resistence.
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.

38. The worm gear is a combination of what?
Magnify or reduce the force which you apply.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
In pounds.
A screw and a spur gear.

39. What is the ratio of any gear train?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Foot- pounds
your arm.
When a resistance is overcome by a force acting through a measurable distance.

40. What are first and third class levers used for?
To magnify the applied force.
Gravity - Magnetism - Friction - Recoil
Connects shafts having a 90 degree angle.
fulcrum- weight- effort

41. How is force measured in work?
Shafts lying at any given angle.
Length of ramp/length of height from floor to truck
2(pie)/pitch
In pounds.

42. What is the first thing a gear can do?
Can change the direction of motion.
Simple machine
In Horsepower.
fulcrum- weight- effort

43. Fractional mechanical advantage
Connects shafts having a 90 degree angle.
Mechanical disadvantage. Use more force than the force of the load you lift.
To magnify the applied force.
Wheel and axle.

44. What is the jack screw used for?
To magnify the applied force.
In pounds.
To raise a house or other heavy machinery.
1

45. How is distance measured in work?
1
Feet.
Count the number of parts of the rope going to and from the movable block.
Third class lever.

46. What is the theoretical mechanical advantage of any gear train?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
The change of the direction of the pull.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Opposite.

47. The threads of a screw are cut so?
Count the number of parts of the rope going to and from the movable block.
A screw and a spur gear.
In Horsepower.
The force used to overcome friction is greater than the force used to do useful work.

48. What direction does the effort and resistance move in first class levers?
Can change the direction of motion.
Opposite.
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.
Work=Force*Distance

49. What is another way to find the mechanical advantage of an inclined plane?
The force used to overcome friction is greater than the force used to do useful work.
Length of ramp/length of height from floor to truck
Power=Work/Time
When a resistance is overcome by a force acting through a measurable distance.

50. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Mechanical disadvantage. Use more force than the force of the load you lift.
Direction - speed or size of the force applied.