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Mechanical Systems 3

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
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 is the formula for the wheel and axle?
Shafts lying at any given angle.
Less than 1.
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
Door knob.

2. How is work done?
Can change the direction of motion.
Third class lever.
When a resistance is overcome by a force acting through a measurable distance.
To magnify the applied force.

3. Class two lever
To speed up the motion of resistence.
fulcrum- weight- effort
Magnify or reduce the force which you apply.
Door knob.

4. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
2(pie)/pitch
1
your arm.

5. How is force measured in work?
In pounds.
Direction - speed or size of the force applied.
Mechanical disadvantage. Use more force than the force of the load you lift.
The rope that passes through your hands is greater than the distance that the load is raised.

6. What is another example of a wheel and axle?
Power=Work/Time
Third class lever.
Door knob.
Shafts lying at any given angle.

7. What kind of machine is the inclined plane?
Can change the direction of motion.
2. Each half of the rope carries an equal amount of weight.
Equals the weight of the object being hoisted.
Simple machine

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

9. What does a micrometer measure?
Same.
A few thousandths of an inch.
Opposite.
Connects shafts having a 90 degree angle.

10. What is the ratio of any gear train?
Mechanical disadvantage. Use more force than the force of the load you lift.
The change of the direction of the pull.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
your arm.

11. What direction does the effort and resistance move in third class levers.
Length of ramp/length of height from floor to truck
32/8 = 4
To magnify the applied force.
Same.

12. With a single fixed sheave what is the only mechanical advantage?
Increase or decrease the the speed of the applied motion.
Third class lever.
The change of the direction of the pull.
Connects shafts having a 90 degree angle.

13. What is the purpose of a third class lever?
Wheel and axle.
Gravity - Magnetism - Friction - Recoil
To speed up the motion of resistence.
Same.

14. The bevel gear is used to connect what?
Opposite.
A screw and a spur gear.
Shafts lying at any given angle.
Can change the direction of motion.

15. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
Opposite.
fulcrum- weight- effort
Work=Force*Distance

16. What are the 4 forces?
Count the number of parts of the rope going to and from the movable block.
Gravity - Magnetism - Friction - Recoil
Power=Work/Time
With oil - grease or soap.

17. What is the theoretical mechanical advantage of any gear train?
To raise a house or other heavy machinery.
your arm.
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

18. How do you measure power?
In Horsepower.
Positive mechanical advantage.
Same.
In pounds.

19. The threads of a screw are cut so?
Magnify or reduce the force which you apply.
In pounds.
Work=Force*Distance
The force used to overcome friction is greater than the force used to do useful work.

20. What is the power formula?
The change of the direction of the pull.
Power=Work/Time
Door knob.
Magnify or reduce the force which you apply.

21. How can you decrease friction on flat surfaces?
With oil - grease or soap.
The change of the direction of the pull.
Shafts lying at any given angle.
Count the number of parts of the rope going to and from the movable block.

22. What direction does the effort and resistance move in first class levers?
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.
In pounds.
Opposite.

23. 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?
Positive mechanical advantage.
32/8 = 4
With oil - grease or soap.
your arm.

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

25. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Simple machine
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.

26. What is one type of second class lever?
To raise a house or other heavy machinery.
Wheel and axle.
To speed up the motion of resistence.
Work=Force*Distance

27. The miter gear faces are beveled at what angle?
45
The force used to overcome friction is greater than the force used to do useful work.
2. Each half of the rope carries an equal amount of weight.
Equals the weight of the object being hoisted.

28. What is the work formula?
In pounds.
When a resistance is overcome by a force acting through a measurable distance.
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
Work=Force*Distance

29. An egg beater has a mechanical advantage of what?
Simple machine
Less than 1.
To magnify the applied force.
The change of the direction of the pull.

30. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
Same.
Equals the weight of the object being hoisted.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

31. Friction is involved when?
Two surfaces move against one another.
A screw and a spur gear.
The rope that passes through your hands is greater than the distance that the load is raised.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

32. What is the mechanical advantage of a single movable block?
In pounds.
2. Each half of the rope carries an equal amount of weight.
Power=Work/Time
Magnify or reduce the force which you apply.

33. What is the jack screw used for?
Can change the direction of motion.
fulcrum- weight- effort
Less than 1.
To raise a house or other heavy machinery.

34. How is distance measured in work?
45
Increase or decrease the the speed of the applied motion.
Feet.
In Horsepower.

35. What are first and third class levers used for?
32/8 = 4
To magnify the applied force.
Power=Work/Time
Mechanical disadvantage. Use more force than the force of the load you lift.

36. How do you find the mechanical advantage?
Feet.
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.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

37. 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.
Mechanical disadvantage. Use more force than the force of the load you lift.
Two surfaces move against one another.
Length of ramp/length of height from floor to truck

38. What is another way to find the mechanical advantage of an inclined plane?
Third class lever.
Length of ramp/length of height from floor to truck
Positive mechanical advantage.
fulcrum- weight- effort

39. What is the formula for the mechanical advantage of a screw?
Feet.
2(pie)/pitch
Wheel and axle.
A screw and a spur gear.

40. Work is measured in units also known as?
Foot- pounds
A few thousandths of an inch.
Connects shafts having a 90 degree angle.
Same.

41. What is an example of a third class lever?
Door knob.
your arm.
To speed up the motion of resistence.
Mechanical disadvantage. Use more force than the force of the load you lift.

42. The worm gear is a combination of what?
Mechanical disadvantage. Use more force than the force of the load you lift.
2(pie)/pitch
A screw and a spur gear.
To raise a house or other heavy machinery.

43. hat is a screw?
45
A modification of an inclined plane.
The force used to overcome friction is greater than the force used to do useful work.
Foot- pounds

44. What is the mechanical advantage for a single fixed block?
1
To raise a house or other heavy machinery.
Simple machine
fulcrum- weight- effort

45. What is the third thing a gear can do?
Foot- pounds
fulcrum- weight- effort
Magnify or reduce the force which you apply.
32/8 = 4

46. What is the first thing a gear can do?
Can change the direction of motion.
Third class lever.
To raise a house or other heavy machinery.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

47. A miter gear connects what?
Power=Work/Time
The force used to overcome friction is greater than the force used to do useful work.
Wheel and axle.
Connects shafts having a 90 degree angle.

48. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Work=Force*Distance
45
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Equals the weight of the object being hoisted.

49. What is the lever formula?
1
The change of the direction of the pull.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Can change the direction of motion.

50. 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.
Same.
Foot- pounds
When a resistance is overcome by a force acting through a measurable distance.