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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. Work is measured in units also known as?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
With oil - grease or soap.
Foot- pounds
A screw and a spur gear.

2. 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.
With oil - grease or soap.
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.

3. What does a micrometer measure?
1
A modification of an inclined plane.
A few thousandths of an inch.
The force used to overcome friction is greater than the force used to do useful work.

4. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
Feet.
Same.
Can change the direction of motion.

5. 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.
To speed up the motion of resistence.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
With oil - grease or soap.

6. What is the first thing a gear can do?
Increase or decrease the the speed of the applied motion.
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.
Same.

7. What is another way to find the mechanical advantage of an inclined plane?
Increase or decrease the the speed of the applied motion.
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.
Shafts lying at any given angle.

8. What is the lever formula?
Less than 1.
Third class lever.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Door knob.

9. What is the work formula?
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.
Length of ramp/length of height from floor to truck
Work=Force*Distance

10. How is distance measured in work?
Positive mechanical advantage.
Feet.
fulcrum- weight- effort
your arm.

11. 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?
When a resistance is overcome by a force acting through a measurable distance.
Positive mechanical advantage.
Same.
32/8 = 4

12. What is the jack screw used for?
Magnify or reduce the force which you apply.
Same.
To raise a house or other heavy machinery.
Increase or decrease the the speed of the applied motion.

13. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Magnify or reduce the force which you apply.
Gravity - Magnetism - Friction - Recoil
Power=Work/Time

14. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
Third class lever.
Power=Work/Time
1

15. An egg beater has a mechanical advantage of what?
Simple machine
The force used to overcome friction is greater than the force used to do useful work.
Less than 1.
Gravity - Magnetism - Friction - Recoil

16. The worm gear is a combination of what?
A screw and a spur gear.
The force used to overcome friction is greater than the force used to do useful work.
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.

17. How do you find the mechanical advantage?
When a resistance is overcome by a force acting through a measurable distance.
your arm.
Magnify or reduce the force which you apply.
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.

18. Fractional mechanical advantage
2. Each half of the rope carries an equal amount of weight.
Less than 1.
2(pie)/pitch
Mechanical disadvantage. Use more force than the force of the load you lift.

19. Gears can do a job for you by changing what three things?
Same.
The force used to overcome friction is greater than the force used to do useful work.
Direction - speed or size of the force applied.
Mechanical disadvantage. Use more force than the force of the load you lift.

20. The miter gear faces are beveled at what angle?
45
Simple machine
Less than 1.
Magnify or reduce the force which you apply.

21. How is force measured in work?
In Horsepower.
In pounds.
Third class lever.
The change of the direction of the pull.

22. What is an example of a third class lever?
Shafts lying at any given angle.
Feet.
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.

23. What is another example of a wheel and axle?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Simple machine
Count the number of parts of the rope going to and from the movable block.
Door knob.

24. How can you figure out the mechanical advantage of most block and falls by glance?
Work=Force*Distance
Count the number of parts of the rope going to and from the movable block.
fulcrum- weight- effort
2. Each half of the rope carries an equal amount of weight.

25. hat is a screw?
Equals the weight of the object being hoisted.
A modification of an inclined plane.
Gravity - Magnetism - Friction - Recoil
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

26. 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.
Work=Force*Distance
Door knob.

27. Formula for fractional mechanical disadvantage.
Direction - speed or size of the force applied.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Simple machine

28. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
A few thousandths of an inch.
The rope that passes through your hands is greater than the distance that the load is raised.
Two surfaces move against one another.

29. How is work done?
Wheel and axle.
Opposite.
2. Each half of the rope carries an equal amount of weight.
When a resistance is overcome by a force acting through a measurable distance.

30. 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.
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.
To magnify the applied force.

31. What direction does the effort and resistance move in the second class levers?
Opposite.
Direction - speed or size of the force applied.
Less than 1.
Same.

32. What kind of mechanical advantage does the first and second class lever provide?
To raise a house or other heavy machinery.
The change of the direction of the pull.
Third class lever.
Positive mechanical advantage.

33. Class two lever
Gravity - Magnetism - Friction - Recoil
fulcrum- weight- effort
A modification of an inclined plane.
A screw and a spur gear.

34. Friction is involved when?
With oil - grease or soap.
2(pie)/pitch
Shafts lying at any given angle.
Two surfaces move against one another.

35. What is the formula for the wheel and axle?
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
Wheel and axle.
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.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

36. What is one type of second class lever?
Wheel and axle.
Gravity - Magnetism - Friction - Recoil
Same.
Same.

37. What direction does the effort and resistance move in third class levers.
Third class lever.
Same.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
To speed up the motion of resistence.

38. The threads of a screw are cut so?
Same.
To magnify the applied force.
A few thousandths of an inch.
The force used to overcome friction is greater than the force used to do useful work.

39. What type of lever provides a fractional mechanical advantage?
The change of the direction of the pull.
Third class lever.
When a resistance is overcome by a force acting through a measurable distance.
Wheel and axle.

40. The bevel gear is used to connect what?
2(pie)/pitch
Less than 1.
Feet.
Shafts lying at any given angle.

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

42. What is the power formula?
Power=Work/Time
Connects shafts having a 90 degree angle.
To raise a house or other heavy machinery.
Magnify or reduce the force which you apply.

43. What are the 4 forces?
Count the number of parts of the rope going to and from the movable block.
Gravity - Magnetism - Friction - Recoil
your arm.
Same.

44. What kind of machine is the inclined plane?
45
1
Simple machine
With oil - grease or soap.

45. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
In pounds.
Magnify or reduce the force which you apply.
Equals the weight of the object being hoisted.

46. What is the formula for the mechanical advantage of a screw?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
The force used to overcome friction is greater than the force used to do useful work.
Wheel and axle.
2(pie)/pitch

47. How do you measure power?
With oil - grease or soap.
Count the number of parts of the rope going to and from the movable block.
Positive mechanical advantage.
In Horsepower.

48. What is the mechanical advantage for a single fixed block?
Feet.
Two surfaces move against one another.
1
Increase or decrease the the speed of the applied motion.

49. What direction does the effort and resistance move in first class levers?
Opposite.
To raise a house or other heavy machinery.
Equals the weight of the object being hoisted.
Two surfaces move against one another.

50. What is the theoretical mechanical advantage of any gear train?
A modification of an inclined plane.
Two surfaces move against one another.
Increase or decrease the the speed of the applied motion.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.