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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 can you figure out the mechanical advantage of most block and falls by glance?
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
Count the number of parts of the rope going to and from the movable block.
The change of the direction of the pull.
Third class lever.

2. What direction does the effort and resistance move in first class levers?
Opposite.
To speed up the motion of resistence.
Simple machine
Positive mechanical advantage.

3. 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?
Feet.
32/8 = 4
fulcrum- weight- effort
Foot- pounds

4. What is the theoretical mechanical advantage of any gear train?
A modification of an inclined plane.
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.
A screw and a spur gear.

5. What are the 4 forces?
Shafts lying at any given angle.
Gravity - Magnetism - Friction - Recoil
Power=Work/Time
Count the number of parts of the rope going to and from the movable block.

6. Class two lever
fulcrum- weight- effort
A screw and a spur gear.
2(pie)/pitch
Same.

7. How is distance measured in work?
Feet.
Opposite.
32/8 = 4
1

8. The worm gear is a combination of 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.
Wheel and axle.
A screw and a spur gear.
32/8 = 4

9. What is another example of a wheel and axle?
fulcrum- weight- effort
2. Each half of the rope carries an equal amount of weight.
your arm.
Door knob.

10. 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
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.
When a resistance is overcome by a force acting through a measurable distance.

11. What kind of machine is the inclined plane?
Length of ramp/length of height from floor to truck
Opposite.
1
Simple machine

12. What is the first thing a gear can do?
32/8 = 4
Foot- pounds
Can change the direction of motion.
A few thousandths of an inch.

13. With a single fixed sheave what is the only mechanical advantage?
1
The change of the direction of the pull.
2(pie)/pitch
Gravity - Magnetism - Friction - Recoil

14. What type of lever provides a fractional mechanical advantage?
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.
The force used to overcome friction is greater than the force used to do useful work.
Third class lever.

15. The miter gear faces are beveled at what angle?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Same.
45
Positive mechanical advantage.

16. How can you decrease friction on flat surfaces?
With oil - grease or soap.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Positive mechanical advantage.
Opposite.

17. An egg beater has a mechanical advantage of what?
Positive mechanical advantage.
your arm.
Less than 1.
Length of ramp/length of height from floor to truck

18. What is one type of second class lever?
2. Each half of the rope carries an equal amount of weight.
Wheel and axle.
In pounds.
Third class lever.

19. What is an example of a third class lever?
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.
With oil - grease or soap.
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.

20. Work is measured in units also known as?
Equals the weight of the object being hoisted.
Foot- pounds
A modification of an inclined plane.
The change of the direction of the pull.

21. What are first and third class levers used for?
Magnify or reduce the force which you apply.
Mechanical disadvantage. Use more force than the force of the load you lift.
To magnify the applied force.
Two surfaces move against one another.

22. Formula for fractional mechanical disadvantage.
When a resistance is overcome by a force acting through a measurable distance.
Increase or decrease the the speed of the applied motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
fulcrum- weight- effort

23. A miter gear connects what?
Direction - speed or size of the force applied.
your arm.
Equals the weight of the object being hoisted.
Connects shafts having a 90 degree angle.

24. What is the jack screw used for?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Equals the weight of the object being hoisted.
Foot- pounds
To raise a house or other heavy machinery.

25. What is the purpose of a third class lever?
To speed up the motion of resistence.
Positive mechanical advantage.
Length of ramp/length of height from floor to truck
Gravity - Magnetism - Friction - Recoil

26. What kind of mechanical advantage does the first and second class lever provide?
To speed up the motion of resistence.
Positive mechanical advantage.
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.

27. Friction is involved when?
Two surfaces move against one another.
The change of the direction of the pull.
When a resistance is overcome by a force acting through a measurable distance.
Direction - speed or size of the force applied.

28. How is work done?
The force used to overcome friction is greater than the force used to do useful work.
To raise a house or other heavy machinery.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
When a resistance is overcome by a force acting through a measurable distance.

29. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
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.
Third class lever.

30. What is the lever formula?
In Horsepower.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
The change of the direction of the pull.
The force used to overcome friction is greater than the force used to do useful work.

31. hat is a screw?
A modification of an inclined plane.
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.
Two surfaces move against one another.
Shafts lying at any given angle.

32. The threads of a screw are cut so?
Third class lever.
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.
The rope that passes through your hands is greater than the distance that the load is raised.

33. What is the second thing a gear can do?
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.
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.

34. The bevel gear is used to connect what?
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.
A screw and a spur gear.
32/8 = 4

35. What is the formula for the wheel and axle?
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
To raise a house or other heavy machinery.
fulcrum- weight- effort

36. What is the work formula?
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
45
Work=Force*Distance
Increase or decrease the the speed of the applied motion.

37. How do you find the mechanical advantage?
2. Each half of the rope carries an equal amount of weight.
Increase or decrease the the speed of the applied motion.
The change of the direction of the pull.
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.

38. 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.

39. How is force measured in work?
The rope that passes through your hands is greater than the distance that the load is raised.
Foot- pounds
In pounds.
Direction - speed or size of the force applied.

40. What direction does the effort and resistance move in the second class levers?
Same.
Count the number of parts of the rope going to and from the movable block.
Two surfaces move against one another.
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.

41. Fractional mechanical advantage
Can change the direction of motion.
32/8 = 4
Mechanical disadvantage. Use more force than the force of the load you lift.
With oil - grease or soap.

42. What is the mechanical advantage of a single movable block?
Magnify or reduce the force which you apply.
2. Each half of the rope carries an equal amount of weight.
your arm.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

43. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Opposite.
Foot- pounds
Third class lever.
Equals the weight of the object being hoisted.

44. What is another way to find the mechanical advantage of an inclined plane?
Simple machine
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Length of ramp/length of height from floor to truck
Increase or decrease the the speed of the applied motion.

45. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
To speed up the motion of resistence.
Connects shafts having a 90 degree angle.
To raise a house or other heavy machinery.

46. How do you measure power?
Positive mechanical advantage.
In Horsepower.
Mechanical disadvantage. Use more force than the force of the load you lift.
Wheel and axle.

47. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Power=Work/Time
The rope that passes through your hands is greater than the distance that the load is raised.
Third class lever.
Wheel and axle.

48. What direction does the effort and resistance move in third class levers.
Same.
When a resistance is overcome by a force acting through a measurable distance.
With oil - grease or soap.
The rope that passes through your hands is greater than the distance that the load is raised.

49. What is the formula for the mechanical advantage of a screw?
Simple machine
2(pie)/pitch
To raise a house or other heavy machinery.
A modification of an inclined plane.

50. What is the power formula?
32/8 = 4
A few thousandths of an inch.
your arm.
Power=Work/Time