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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 are the 4 forces?
Gravity - Magnetism - Friction - Recoil
When a resistance is overcome by a force acting through a measurable distance.
The change of the direction of the pull.
45

2. What is the first thing a gear can do?
In pounds.
2. Each half of the rope carries an equal amount of weight.
Feet.
Can change the direction of motion.

3. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
Less than 1.
The force used to overcome friction is greater than the force used to do useful work.
Feet.

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

5. 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.
Increase or decrease the the speed of the applied motion.
Mechanical disadvantage. Use more force than the force of the load you lift.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

6. What is the formula for the mechanical advantage of a screw?
Length of ramp/length of height from floor to truck
Mechanical disadvantage. Use more force than the force of the load you lift.
Same.
2(pie)/pitch

7. The miter gear faces are beveled at what angle?
Less than 1.
Gravity - Magnetism - Friction - Recoil
45
To speed up the motion of resistence.

8. What is the mechanical advantage for a single fixed block?
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
Connects shafts having a 90 degree angle.
With oil - grease or soap.

9. What direction does the effort and resistance move in third class levers.
Same.
2(pie)/pitch
Direction - speed or size of the force applied.
With oil - grease or soap.

10. What is an example of a third class lever?
Positive mechanical advantage.
In Horsepower.
Connects shafts having a 90 degree angle.
your arm.

11. How can you figure out the mechanical advantage of most block and falls by glance?
A few thousandths of an inch.
To raise a house or other heavy machinery.
Gravity - Magnetism - Friction - Recoil
Count the number of parts of the rope going to and from the movable block.

12. A miter gear connects what?
A modification of an inclined plane.
The force used to overcome friction is greater than the force used to do useful work.
To speed up the motion of resistence.
Connects shafts having a 90 degree angle.

13. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
fulcrum- weight- effort
Increase or decrease the the speed of the applied motion.
A modification of an inclined plane.
The rope that passes through your hands is greater than the distance that the load is raised.

14. hat is a screw?
2. Each half of the rope carries an equal amount of weight.
A modification of an inclined plane.
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.

15. Class two lever
fulcrum- weight- effort
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.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

16. What is the power formula?
When a resistance is overcome by a force acting through a measurable distance.
2. Each half of the rope carries an equal amount of weight.
Power=Work/Time
Direction - speed or size of the force applied.

17. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
To speed up the motion of resistence.
Feet.
A few thousandths of an inch.

18. Work is measured in units also known as?
The change of the direction of the pull.
Less than 1.
Foot- pounds
Length of ramp/length of height from floor to truck

19. How do you measure power?
In Horsepower.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Count the number of parts of the rope going to and from the movable block.
A modification of an inclined plane.

20. Friction is involved when?
A few thousandths of an inch.
Mechanical disadvantage. Use more force than the force of the load you lift.
Two surfaces move against one another.
Third class lever.

21. What direction does the effort and resistance move in first class levers?
Same.
Length of ramp/length of height from floor to truck
1
Opposite.

22. What are first and third class levers used for?
In pounds.
The change of the direction of the pull.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
To magnify the applied force.

23. What is one type of second class lever?
Wheel and axle.
In Horsepower.
Mechanical disadvantage. Use more force than the force of the load you lift.
With oil - grease or soap.

24. Fractional mechanical advantage
A few thousandths of an inch.
Direction - speed or size of the force applied.
Mechanical disadvantage. Use more force than the force of the load you lift.
45

25. 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
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.
1
2. Each half of the rope carries an equal amount of weight.

26. What is the lever formula?
your arm.
Same.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Simple machine

27. 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
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Feet.
Length of ramp/length of height from floor to truck

28. What is the jack screw used for?
Work=Force*Distance
To raise a house or other heavy machinery.
Same.
A screw and a spur gear.

29. What is the theoretical mechanical advantage of any gear train?
When a resistance is overcome by a force acting through a measurable distance.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
32/8 = 4
Power=Work/Time

30. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Door knob.
Equals the weight of the object being hoisted.
To raise a house or other heavy machinery.
Foot- pounds

31. The bevel gear is used to connect what?
The change of the direction of the pull.
Third class lever.
Wheel and axle.
Shafts lying at any given angle.

32. An egg beater has a mechanical advantage of what?
32/8 = 4
Count the number of parts of the rope going to and from the movable block.
The force used to overcome friction is greater than the force used to do useful work.
Less than 1.

33. What is another example of a wheel and axle?
Same.
Door knob.
A screw and a spur gear.
fulcrum- weight- effort

34. What is another way to find the mechanical advantage of an inclined plane?
Same.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
The rope that passes through your hands is greater than the distance that the load is raised.
Length of ramp/length of height from floor to truck

35. How is force measured in work?
In pounds.
Opposite.
With oil - grease or soap.
The rope that passes through your hands is greater than the distance that the load is raised.

36. What is the second thing a gear can do?
Same.
Increase or decrease the the speed of the applied motion.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
2(pie)/pitch

37. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
45
Same.
Work=Force*Distance

38. What type of lever provides a fractional mechanical advantage?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Less than 1.
Length of ramp/length of height from floor to truck
Third class lever.

39. What is the purpose of a third class lever?
When a resistance is overcome by a force acting through a measurable distance.
Less than 1.
fulcrum- weight- effort
To speed up the motion of resistence.

40. What does a micrometer measure?
fulcrum- weight- effort
A few thousandths of an inch.
Two surfaces move against one another.
Third class lever.

41. The worm gear is a combination of what?
Feet.
Connects shafts having a 90 degree angle.
Magnify or reduce the force which you apply.
A screw and a spur gear.

42. How can you decrease friction on flat surfaces?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
To magnify the applied force.
Gravity - Magnetism - Friction - Recoil
With oil - grease or soap.

43. What direction does the effort and resistance move in the second class levers?
Same.
Increase or decrease the the speed of the applied motion.
45
Mechanical disadvantage. Use more force than the force of the load you lift.

44. What kind of machine is the inclined plane?
Work=Force*Distance
Simple machine
Count the number of parts of the rope going to and from the movable block.
32/8 = 4

45. How is distance measured in work?
Feet.
When a resistance is overcome by a force acting through a measurable distance.
In pounds.
Same.

46. Gears can do a job for you by changing what three things?
Magnify or reduce the force which you apply.
When a resistance is overcome by a force acting through a measurable distance.
To magnify the applied force.
Direction - speed or size of the force applied.

47. How is work done?
In pounds.
Door knob.
2(pie)/pitch
When a resistance is overcome by a force acting through a measurable distance.

48. How do you find the mechanical advantage?
Shafts lying at any given angle.
Connects shafts having a 90 degree angle.
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.

49. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
A screw and a spur gear.
Equals the weight of the object being hoisted.
Same.

50. What is the work formula?
Magnify or reduce the force which you apply.
Work=Force*Distance
A screw and a spur gear.
Direction - speed or size of the force applied.