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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 is the jack screw used for?
Increase or decrease the the speed of the applied motion.
Less than 1.
Simple machine
To raise a house or other heavy machinery.

2. How is force measured in work?
In pounds.
Length of ramp/length of height from floor to truck
Equals the weight of the object being hoisted.
Connects shafts having a 90 degree angle.

3. What is the formula for the mechanical advantage of a screw?
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.
2(pie)/pitch
Equals the weight of the object being hoisted.

4. How is distance measured in work?
Feet.
fulcrum- weight- effort
45
Third class lever.

5. A miter gear connects what?
45
Connects shafts having a 90 degree angle.
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.
Power=Work/Time

6. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
Mechanical disadvantage. Use more force than the force of the load you lift.
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.

7. How do you find the mechanical advantage?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Same.
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.

8. Work is measured in units also known as?
To raise a house or other heavy machinery.
In Horsepower.
Foot- pounds
Two surfaces move against one another.

9. What direction does the effort and resistance move in third class levers.
Positive mechanical advantage.
Same.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
fulcrum- weight- effort

10. hat is a screw?
Same.
Door knob.
Wheel and axle.
A modification of an inclined plane.

11. How do you measure power?
In pounds.
Equals the weight of the object being hoisted.
In Horsepower.
With oil - grease or soap.

12. What is the mechanical advantage for a single fixed block?
The change of the direction of the pull.
1
In pounds.
Opposite.

13. What is the theoretical mechanical advantage of any gear train?
The rope that passes through your hands is greater than the distance that the load is raised.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Direction - speed or size of the force applied.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

14. What is an example of a third class lever?
When a resistance is overcome by a force acting through a measurable distance.
The force used to overcome friction is greater than the force used to do useful work.
your arm.
In pounds.

15. What is the purpose of a third class lever?
Magnify or reduce the force which you apply.
The rope that passes through your hands is greater than the distance that the load is raised.
Count the number of parts of the rope going to and from the movable block.
To speed up the motion of resistence.

16. What are the 4 forces?
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
Direction - speed or size of the force applied.
Gravity - Magnetism - Friction - Recoil
32/8 = 4

17. An egg beater has a mechanical advantage of what?
Less than 1.
The change of the direction of the pull.
Foot- pounds
To magnify the applied force.

18. Fractional mechanical advantage
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
Mechanical disadvantage. Use more force than the force of the load you lift.

19. The miter gear faces are beveled at what angle?
Wheel and axle.
With oil - grease or soap.
45
2. Each half of the rope carries an equal amount of weight.

20. What is the third thing a gear can do?
The rope that passes through your hands is greater than the distance that the load is raised.
The change of the direction of the pull.
Magnify or reduce the force which you apply.
Foot- pounds

21. The worm gear is a combination of what?
Equals the weight of the object being hoisted.
2. Each half of the rope carries an equal amount of weight.
The rope that passes through your hands is greater than the distance that the load is raised.
A screw and a spur gear.

22. What is the work formula?
Foot- pounds
Work=Force*Distance
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Less than 1.

23. 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.
With oil - grease or soap.
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 the driven gears/ divided by the product of the number of teeth on the driver gears.

24. What is the second thing a gear can do?
1
The rope that passes through your hands is greater than the distance that the load is raised.
Opposite.
Increase or decrease the the speed of the applied motion.

25. What direction does the effort and resistance move in the second class levers?
Same.
1
Feet.
Increase or decrease the the speed of the applied motion.

26. 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
To magnify the applied force.
2(pie)/pitch
Opposite.

27. What is the formula for the wheel and axle?
Opposite.
Count the number of parts of the rope going to and from the movable block.
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

28. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
The rope that passes through your hands is greater than the distance that the load is raised.
Work=Force*Distance
The change of the direction of the pull.
In Horsepower.

29. What is the first thing a gear can do?
Count the number of parts of the rope going to and from the movable block.
Can change the direction of motion.
Positive mechanical advantage.
The rope that passes through your hands is greater than the distance that the load is raised.

30. What kind of machine is the inclined plane?
With oil - grease or soap.
A screw and a spur gear.
Simple machine
Same.

31. What is another example of a wheel and axle?
Gravity - Magnetism - Friction - Recoil
Opposite.
your arm.
Door knob.

32. What are first and third class levers used for?
Can change the direction of motion.
To magnify the applied force.
The force used to overcome friction is greater than the force used to do useful work.
Less than 1.

33. What is the lever formula?
With oil - grease or soap.
The force used to overcome friction is greater than the force used to do useful work.
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.

34. What direction does the effort and resistance move in first class levers?
your arm.
Simple machine
When a resistance is overcome by a force acting through a measurable distance.
Opposite.

35. What is the ratio of any gear train?
A few thousandths of an inch.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
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.

36. What is the power formula?
Shafts lying at any given angle.
To speed up the motion of resistence.
Power=Work/Time
In pounds.

37. How is work done?
Gravity - Magnetism - Friction - Recoil
Work=Force*Distance
When a resistance is overcome by a force acting through a measurable distance.
Foot- pounds

38. Gears can do a job for you by changing what three things?
fulcrum- weight- effort
In Horsepower.
Direction - speed or size of the force applied.
The force used to overcome friction is greater than the force used to do useful work.

39. Friction is involved when?
Two surfaces move against one another.
Opposite.
Mechanical disadvantage. Use more force than the force of the load you lift.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

40. Class two lever
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
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

41. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
Same.
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.
45

42. The threads of a screw are cut so?
Door knob.
Wheel and axle.
The force used to overcome friction is greater than the force used to do useful work.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

43. What kind of mechanical advantage does the first and second class lever provide?
Mechanical disadvantage. Use more force than the force of the load you lift.
Positive mechanical advantage.
Feet.
To raise a house or other heavy machinery.

44. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
A modification of an inclined plane.
Equals the weight of the object being hoisted.
1
To raise a house or other heavy machinery.

45. What does a micrometer measure?
To magnify the applied force.
A few thousandths of an inch.
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

46. 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.
In Horsepower.
your arm.
The change of the direction of the pull.

47. What is one type of second class lever?
Direction - speed or size of the force applied.
Wheel and axle.
A screw and a spur gear.
When a resistance is overcome by a force acting through a measurable distance.

48. What type of lever provides a fractional mechanical advantage?
Mechanical disadvantage. Use more force than the force of the load you lift.
Third class lever.
With oil - grease or soap.
Two surfaces move against one another.

49. How can you figure out the mechanical advantage of most block and falls by glance?
A modification of an inclined plane.
Positive mechanical advantage.
When a resistance is overcome by a force acting through a measurable distance.
Count the number of parts of the rope going to and from the movable block.

50. The bevel gear is used to connect what?
When a resistance is overcome by a force acting through a measurable distance.
your arm.
Shafts lying at any given angle.
Length of ramp/length of height from floor to truck