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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?
2(pie)/pitch
Foot- pounds
When a resistance is overcome by a force acting through a measurable distance.
Shafts lying at any given angle.

2. What is the jack screw used for?
To raise a house or other heavy machinery.
In Horsepower.
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.

3. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Power=Work/Time
Count the number of parts of the rope going to and from the movable block.
When a resistance is overcome by a force acting through a measurable distance.

4. What is the mechanical advantage of a single movable block?
45
Power=Work/Time
Increase or decrease the the speed of the applied motion.
2. Each half of the rope carries an equal amount of weight.

5. Fractional mechanical advantage
Third class lever.
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.
The force used to overcome friction is greater than the force used to do useful work.

6. A miter gear connects what?
Connects shafts having a 90 degree angle.
fulcrum- weight- effort
Mechanical disadvantage. Use more force than the force of the load you lift.
Opposite.

7. What is the purpose of a third class lever?
To speed up the motion of resistence.
Opposite.
The change of the direction of the pull.
Increase or decrease the the speed of the applied motion.

8. The worm gear is a combination of what?
Same.
A screw and a spur gear.
Increase or decrease the the speed of the applied motion.
To speed up the motion of resistence.

9. How do you find the mechanical advantage?
Less than 1.
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.
To magnify the applied force.

10. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Work=Force*Distance
The rope that passes through your hands is greater than the distance that the load is raised.
Magnify or reduce the force which you apply.

11. How is work done?
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.
Length of ramp/length of height from floor to truck

12. 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.
Work=Force*Distance
Length of ramp/length of height from floor to truck
Shafts lying at any given angle.

13. How do you measure power?
Count the number of parts of the rope going to and from the movable block.
Equals the weight of the object being hoisted.
In Horsepower.
With oil - grease or soap.

14. How can you decrease friction on flat surfaces?
The force used to overcome friction is greater than the force used to do useful work.
With oil - grease or soap.
Count the number of parts of the rope going to and from the movable block.
A modification of an inclined plane.

15. With a single fixed sheave what is the only mechanical advantage?
To raise a house or other heavy machinery.
1
The change of the direction of the pull.
Connects shafts having a 90 degree angle.

16. What is the work formula?
To magnify the applied force.
Work=Force*Distance
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Feet.

17. What does a micrometer measure?
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.
Foot- pounds
A few thousandths of an inch.
fulcrum- weight- effort

18. Friction is involved when?
Two surfaces move against one another.
Can change the direction of motion.
45
Increase or decrease the the speed of the applied motion.

19. What type of lever provides a fractional mechanical advantage?
Increase or decrease the the speed of the applied motion.
Door knob.
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
Third class lever.

20. What is the theoretical mechanical advantage of any gear train?
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.
Shafts lying at any given angle.
Two surfaces move against one another.

21. What is one type of second class lever?
Wheel and axle.
A few thousandths of an inch.
Length of ramp/length of height from floor to truck
The rope that passes through your hands is greater than the distance that the load is raised.

22. What is the third thing a gear can do?
With oil - grease or soap.
Third class lever.
Wheel and axle.
Magnify or reduce the force which you apply.

23. hat is a screw?
Equals the weight of the object being hoisted.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
A modification of an inclined plane.
Direction - speed or size of the force applied.

24. 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?
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.
Shafts lying at any given angle.
32/8 = 4

25. What are the 4 forces?
Connects shafts having a 90 degree angle.
Third class lever.
Gravity - Magnetism - Friction - Recoil
Positive mechanical advantage.

26. Class two lever
To speed up the motion of resistence.
Mechanical disadvantage. Use more force than the force of the load you lift.
45
fulcrum- weight- effort

27. 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.
Foot- pounds
A modification of an inclined plane.
Same.

28. 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.
Door knob.
Connects shafts having a 90 degree angle.
Opposite.

29. What direction does the effort and resistance move in first class levers?
Can change the direction of motion.
Opposite.
A modification of an inclined plane.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

30. What is the second thing a gear can do?
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
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Feet.
Increase or decrease the the speed of the applied motion.

31. What are first and third class levers used for?
To magnify the applied force.
Shafts lying at any given angle.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
32/8 = 4

32. The bevel gear is used to connect what?
Same.
Shafts lying at any given angle.
Direction - speed or size of the force applied.
Mechanical disadvantage. Use more force than the force of the load you lift.

33. Formula for fractional mechanical disadvantage.
Wheel and axle.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Connects shafts having a 90 degree angle.
Direction - speed or size of the force applied.

34. What is another example of a wheel and axle?
Power=Work/Time
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.
Door knob.
Gravity - Magnetism - Friction - Recoil

35. Gears can do a job for you by changing what three things?
Connects shafts having a 90 degree angle.
Direction - speed or size of the force applied.
Length of ramp/length of height from floor to truck
Door knob.

36. What direction does the effort and resistance move in the second class levers?
Feet.
Can change the direction of motion.
The rope that passes through your hands is greater than the distance that the load is raised.
Same.

37. What is another way to find the mechanical advantage of an inclined plane?
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.
Length of ramp/length of height from floor to truck

38. The miter gear faces are beveled at what angle?
Can change the direction of motion.
Direction - speed or size of the force applied.
Connects shafts having a 90 degree angle.
45

39. What kind of machine is the inclined plane?
Simple machine
In Horsepower.
To magnify the applied force.
Same.

40. What is the formula for the mechanical advantage of a screw?
In pounds.
2(pie)/pitch
To speed up the motion of resistence.
your arm.

41. What is the first thing a gear can do?
Can change the direction of motion.
The force used to overcome friction is greater than the force used to do useful work.
Wheel and axle.
fulcrum- weight- effort

42. What is the mechanical advantage for a single fixed block?
Foot- pounds
32/8 = 4
Third class lever.
1

43. What is the power formula?
Two surfaces move against one another.
A few thousandths of an inch.
Simple machine
Power=Work/Time

44. What is an example of a third class lever?
Connects shafts having a 90 degree angle.
Direction - speed or size of the force applied.
your arm.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

45. The threads of a screw are cut so?
your arm.
The force used to overcome friction is greater than the force used to do useful work.
Same.
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

46. 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.
Length of ramp/length of height from floor to truck
45
When a resistance is overcome by a force acting through a measurable distance.

47. What direction does the effort and resistance move in third class levers.
Direction - speed or size of the force applied.
When a resistance is overcome by a force acting through a measurable distance.
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.

48. How is force measured in work?
Foot- pounds
In pounds.
A screw and a spur gear.
fulcrum- weight- effort

49. 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
In Horsepower.
Mechanical disadvantage. Use more force than the force of the load you lift.
1

50. How is distance measured in work?
Feet.
Shafts lying at any given angle.
2(pie)/pitch
Power=Work/Time