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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. How is force measured in work?
Foot- pounds
In Horsepower.
Door knob.
In pounds.

2. The threads of a screw are cut so?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
The force used to overcome friction is greater than the force used to do useful work.
In Horsepower.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

3. What type of lever provides a fractional mechanical advantage?
Foot- pounds
To speed up the motion of resistence.
A screw and a spur gear.
Third class lever.

4. What is the first thing a gear can do?
Third class lever.
Magnify or reduce the force which you apply.
Equals the weight of the object being hoisted.
Can change the direction of motion.

5. What is an example of a third class lever?
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.
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.

6. What are first and third class levers used for?
The force used to overcome friction is greater than the force used to do useful work.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Increase or decrease the the speed of the applied motion.
To magnify the applied force.

7. How do you measure power?
Positive mechanical advantage.
A modification of an inclined plane.
Count the number of parts of the rope going to and from the movable block.
In Horsepower.

8. hat is a screw?
The force used to overcome friction is greater than the force used to do useful work.
A modification of an inclined plane.
Positive mechanical advantage.
Increase or decrease the the speed of the applied motion.

9. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Same.
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.

10. What does a micrometer measure?
Magnify or reduce the force which you apply.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
A few thousandths of an inch.

11. What is the second thing a gear can do?
In pounds.
Increase or decrease the the speed of the applied motion.
To raise a house or other heavy machinery.
fulcrum- weight- effort

12. Gears can do a job for you by changing what three things?
Two surfaces move against one another.
Direction - speed or size of the force applied.
Feet.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

13. What is one type of second class lever?
Wheel and axle.
Feet.
When a resistance is overcome by a force acting through a measurable distance.
32/8 = 4

14. A miter gear connects what?
Power=Work/Time
Work=Force*Distance
Same.
Connects shafts having a 90 degree angle.

15. What kind of machine is the inclined plane?
Foot- pounds
In Horsepower.
2(pie)/pitch
Simple machine

16. What direction does the effort and resistance move in first class levers?
To raise a house or other heavy machinery.
Positive mechanical advantage.
2(pie)/pitch
Opposite.

17. What is the formula for the 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.
Mechanical disadvantage. Use more force than the force of the load you lift.
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.

18. 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.
Mechanical disadvantage. Use more force than the force of the load you lift.
When a resistance is overcome by a force acting through a measurable distance.
Equals the weight of the object being hoisted.

19. Formula for fractional mechanical disadvantage.
Increase or decrease the the speed of the applied motion.
To magnify the applied force.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Can change the direction of motion.

20. What is the work formula?
Work=Force*Distance
your arm.
Third class lever.
Positive mechanical advantage.

21. What are the 4 forces?
In pounds.
Gravity - Magnetism - Friction - Recoil
Positive mechanical advantage.
Connects shafts having a 90 degree angle.

22. What is the power formula?
To speed up the motion of resistence.
2. Each half of the rope carries an equal amount of weight.
With oil - grease or soap.
Power=Work/Time

23. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Equals the weight of the object being hoisted.
To speed up the motion of resistence.
Door knob.
Opposite.

24. The worm gear is a combination of what?
Increase or decrease the the speed of the applied motion.
A screw and a spur gear.
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

25. What is the mechanical advantage of a single movable block?
To raise a house or other heavy machinery.
2. Each half of the rope carries an equal amount of weight.
Equals the weight of the object being hoisted.
Feet.

26. What is another way to find the mechanical advantage of an inclined plane?
A screw and a spur gear.
Third class lever.
Length of ramp/length of height from floor to truck
Mechanical disadvantage. Use more force than the force of the load you lift.

27. What is the theoretical mechanical advantage of any gear train?
Feet.
The force used to overcome friction is greater than the force used to do useful work.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Same.

28. What direction does the effort and resistance move in the second class levers?
1
Same.
In pounds.
Foot- pounds

29. What is the mechanical advantage for a single fixed block?
fulcrum- weight- effort
1
A modification of an inclined plane.
2(pie)/pitch

30. Class two lever
In pounds.
The rope that passes through your hands is greater than the distance that the load is raised.
fulcrum- weight- effort
Length of ramp/length of height from floor to truck

31. What is the ratio of any gear train?
Same.
When a resistance is overcome by a force acting through a measurable distance.
Can change the direction of motion.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

32. Work is measured in units also known as?
Opposite.
In pounds.
Foot- pounds
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

33. The miter gear faces are beveled at what angle?
45
Length of ramp/length of height from floor to truck
The force used to overcome friction is greater than the force used to do useful work.
Magnify or reduce the force which you apply.

34. Friction is involved when?
Two surfaces move against one another.
Direction - speed or size of the force applied.
fulcrum- weight- effort
2(pie)/pitch

35. What is the jack screw used for?
Mechanical disadvantage. Use more force than the force of the load you lift.
The force used to overcome friction is greater than the force used to do useful work.
To raise a house or other heavy machinery.
Increase or decrease the the speed of the applied motion.

36. What is the third thing a gear can do?
Positive mechanical advantage.
Magnify or reduce the force which you apply.
Work=Force*Distance
Feet.

37. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
Length of ramp/length of height from floor to truck
Work=Force*Distance
Feet.

38. What is the formula for the mechanical advantage of a screw?
Same.
32/8 = 4
2(pie)/pitch
In pounds.

39. 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.
Can change the direction of motion.
1
Door knob.

40. What is another example of a wheel and axle?
Count the number of parts of the rope going to and from the movable block.
Gravity - Magnetism - Friction - Recoil
Door knob.
Magnify or reduce the force which you apply.

41. An egg beater has a mechanical advantage of what?
Door knob.
Can change the direction of motion.
Power=Work/Time
Less than 1.

42. What direction does the effort and resistance move in third class levers.
To raise a house or other heavy machinery.
Same.
Feet.
Direction - speed or size of the force applied.

43. How do you find the mechanical advantage?
Foot- pounds
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.
Direction - speed or size of the force applied.

44. With a single fixed sheave what is the only mechanical advantage?
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.
The change of the direction of the pull.
Power=Work/Time

45. Fractional mechanical advantage
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.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
2(pie)/pitch

46. What is the purpose of a third class lever?
A screw and a spur gear.
To magnify the applied force.
To raise a house or other heavy machinery.
To speed up the motion of resistence.

47. The bevel gear is used to connect what?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Shafts lying at any given angle.
Can change the direction of motion.
Wheel and axle.

48. How is distance measured in work?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Feet.
The change of the direction of the pull.
Increase or decrease the the speed of the applied motion.

49. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Magnify or reduce the force which you apply.
fulcrum- weight- effort
Shafts lying at any given angle.

50. 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?
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 screw and a spur gear.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
32/8 = 4