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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. What kind of machine is the inclined plane?
A few thousandths of an inch.
Simple machine
Can change the direction of motion.
To speed up the motion of resistence.

2. What is the jack screw used for?
The force used to overcome friction is greater than the force used to do useful work.
To raise a house or other heavy machinery.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A few thousandths of an inch.

3. 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?
32/8 = 4
Same.
1
Gravity - Magnetism - Friction - Recoil

4. The worm gear is a combination of what?
To magnify the applied force.
To speed up the motion of resistence.
45
A screw and a spur gear.

5. 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.
The rope that passes through your hands is greater than the distance that the load is raised.
With oil - grease or soap.
Can change the direction of motion.

6. Fractional mechanical advantage
To raise a house or other heavy machinery.
Mechanical disadvantage. Use more force than the force of the load you lift.
A few thousandths of an inch.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

7. The bevel gear is used to connect what?
The force used to overcome friction is greater than the force used to do useful work.
Foot- pounds
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Shafts lying at any given angle.

8. What direction does the effort and resistance move in first class levers?
In Horsepower.
In pounds.
Opposite.
A few thousandths of an inch.

9. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
32/8 = 4
Simple machine
The change of the direction of the pull.

10. What type of lever provides a fractional mechanical advantage?
1
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.
Third class lever.

11. What is the mechanical advantage for a single fixed block?
Magnify or reduce the force which you apply.
1
When a resistance is overcome by a force acting through a measurable distance.
2(pie)/pitch

12. How is force measured in work?
Magnify or reduce the force which you apply.
A screw and a spur gear.
In pounds.
A modification of an inclined plane.

13. A miter gear connects what?
To magnify the applied force.
With oil - grease or soap.
Connects shafts having a 90 degree angle.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

14. How do you find the mechanical advantage?
Count the number of parts of the rope going to and from the movable block.
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.
The change of the direction of the pull.
1

15. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Direction - speed or size of the force applied.
Same.
The force used to overcome friction is greater than the force used to do useful work.

16. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
fulcrum- weight- effort
Can change the direction of motion.
In pounds.

17. Friction is involved when?
Increase or decrease the the speed of the applied motion.
Same.
Two surfaces move against one another.
Connects shafts having a 90 degree angle.

18. How is distance measured in work?
Third class lever.
Two surfaces move against one another.
2(pie)/pitch
Feet.

19. What is the formula for the mechanical advantage of a screw?
Count the number of parts of the rope going to and from the movable block.
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

20. What is the formula for the 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.
The change of the direction of the pull.
The force used to overcome friction is greater than the force used to do useful work.
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

21. What is the work formula?
In pounds.
Work=Force*Distance
1
Less than 1.

22. What kind of mechanical advantage does the first and second class lever provide?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
The force used to overcome friction is greater than the force used to do useful work.
Positive mechanical advantage.
The change of the direction of the pull.

23. hat is a screw?
Simple machine
Two surfaces move against one another.
Less than 1.
A modification of an inclined plane.

24. An egg beater has a mechanical advantage of what?
Same.
1
The change of the direction of the pull.
Less than 1.

25. What is the ratio of any gear train?
Third class lever.
A modification of an inclined plane.
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.

26. What is the first thing a gear can do?
Positive mechanical advantage.
Can change the direction of motion.
Gravity - Magnetism - Friction - Recoil
Connects shafts having a 90 degree angle.

27. What direction does the effort and resistance move in third class levers.
Direction - speed or size of the force applied.
To magnify the applied force.
Third class lever.
Same.

28. Class two lever
The force used to overcome friction is greater than the force used to do useful work.
In Horsepower.
fulcrum- weight- effort
Work=Force*Distance

29. What is the power formula?
The force used to overcome friction is greater than the force used to do useful work.
Two surfaces move against one another.
Can change the direction of motion.
Power=Work/Time

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

31. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
To raise a house or other heavy machinery.
Power=Work/Time
To speed up the motion of resistence.

32. What is another example of a wheel and axle?
Door knob.
Same.
Gravity - Magnetism - Friction - Recoil
Direction - speed or size of the force applied.

33. What is an example of a third class lever?
Magnify or reduce the force which you apply.
your arm.
2(pie)/pitch
Direction - speed or size of the force applied.

34. What does a micrometer measure?
A few thousandths of an inch.
2(pie)/pitch
The force used to overcome friction is greater than the force used to do useful work.
Opposite.

35. What are the 4 forces?
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.
In pounds.
Same.
Gravity - Magnetism - Friction - Recoil

36. What is one type of second class lever?
Magnify or reduce the force which you apply.
When a resistance is overcome by a force acting through a measurable distance.
Wheel and axle.
Foot- pounds

37. With a single fixed sheave what is the only mechanical advantage?
Gravity - Magnetism - Friction - Recoil
Work=Force*Distance
The change of the direction of the pull.
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. How can you figure out the mechanical advantage of most block and falls by glance?
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.
Count the number of parts of the rope going to and from the movable block.
32/8 = 4

39. The miter gear faces are beveled at what angle?
A few thousandths of an inch.
Power=Work/Time
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
45

40. What is the lever formula?
Shafts lying at any given angle.
Two surfaces move against one another.
A screw and a spur gear.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

41. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
In pounds.
A modification of an inclined plane.
Equals the weight of the object being hoisted.
A screw and a spur gear.

42. What is the second thing a gear can do?
Connects shafts having a 90 degree angle.
Increase or decrease the the speed of the applied motion.
To magnify the applied force.
Mechanical disadvantage. Use more force than the force of the load you lift.

43. 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.
Positive mechanical advantage.
Length of ramp/length of height from floor to truck
In Horsepower.

44. Work is measured in units also known as?
Door knob.
Foot- pounds
Mechanical disadvantage. Use more force than the force of the load you lift.
To speed up the motion of resistence.

45. How is work done?
Less than 1.
A few thousandths of an inch.
A screw and a spur gear.
When a resistance is overcome by a force acting through a measurable distance.

46. What is the purpose of a third class lever?
Same.
Increase or decrease the the speed of the applied motion.
To raise a house or other heavy machinery.
To speed up the motion of resistence.

47. What is the mechanical advantage of a single movable block?
Power=Work/Time
To speed up the motion of resistence.
2. Each half of the rope carries an equal amount of weight.
Work=Force*Distance

48. The threads of a screw are cut so?
In pounds.
The force used to overcome friction is greater than the force used to do useful work.
To raise a house or other heavy machinery.
Mechanical disadvantage. Use more force than the force of the load you lift.

49. How do you measure power?
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.
Door knob.
In Horsepower.

50. What are first and third class levers used for?
your arm.
Feet.
To magnify the applied force.
Wheel and axle.