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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 work done?
A modification of an inclined plane.
When a resistance is overcome by a force acting through a measurable distance.
Foot- pounds
Feet.

2. What does a micrometer measure?
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.
fulcrum- weight- effort
32/8 = 4

3. How do you measure power?
Mechanical disadvantage. Use more force than the force of the load you lift.
In Horsepower.
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.

4. What is the jack screw used for?
Power=Work/Time
To raise a house or other heavy machinery.
In Horsepower.
A screw and a spur gear.

5. What type of lever provides a fractional mechanical advantage?
Third class lever.
Length of ramp/length of height from floor to truck
Gravity - Magnetism - Friction - Recoil
2. Each half of the rope carries an equal amount of weight.

6. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
Simple machine
Gravity - Magnetism - Friction - Recoil
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

7. What are first and third class levers used for?
Count the number of parts of the rope going to and from the movable block.
To magnify the applied force.
fulcrum- weight- effort
Wheel and axle.

8. What is the first thing a gear can do?
Foot- pounds
Can change the direction of motion.
The change of the direction of the pull.
The force used to overcome friction is greater than the force used to do useful work.

9. Friction is involved when?
To magnify the applied force.
Two surfaces move against one another.
To speed up the motion of resistence.
Feet.

10. What is the work formula?
your arm.
Same.
Work=Force*Distance
A few thousandths of an inch.

11. The threads of a screw are cut so?
Work=Force*Distance
The force used to overcome friction is greater than the force used to do useful work.
Count the number of parts of the rope going to and from the movable block.
The change of the direction of the pull.

12. What is an example of a third class lever?
fulcrum- weight- effort
Power=Work/Time
To raise a house or other heavy machinery.
your arm.

13. What is the lever formula?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Magnify or reduce the force which you apply.
Same.

14. What is the power formula?
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
Power=Work/Time
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

15. The bevel gear is used to connect what?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
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.
Length of ramp/length of height from floor to truck

16. What is the ratio of any gear train?
To raise a house or other heavy machinery.
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
Direction - speed or size of the force applied.

17. What is the mechanical advantage for a single fixed block?
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
In pounds.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

18. What is the formula for the wheel and axle?
A screw and a spur 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.
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
fulcrum- weight- effort

19. A miter gear connects what?
Less than 1.
Equals the weight of the object being hoisted.
fulcrum- weight- effort
Connects shafts having a 90 degree angle.

20. What is the theoretical mechanical advantage of any gear train?
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.
Power=Work/Time
To raise a house or other heavy machinery.

21. An egg beater has a mechanical advantage of what?
Equals the weight of the object being hoisted.
In pounds.
Less than 1.
Connects shafts having a 90 degree angle.

22. What kind of mechanical advantage does the first and second class lever provide?
In Horsepower.
Opposite.
Positive mechanical advantage.
When a resistance is overcome by a force acting through a measurable distance.

23. How is distance measured in work?
Connects shafts having a 90 degree angle.
Feet.
2. Each half of the rope carries an equal amount of weight.
With oil - grease or soap.

24. What is the formula for the mechanical advantage of a screw?
The force used to overcome friction is greater than the force used to do useful work.
2(pie)/pitch
Same.
A screw and a spur gear.

25. Work is measured in units also known as?
Can change the direction of motion.
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.
Equals the weight of the object being hoisted.
Foot- pounds

26. The worm gear is a combination of what?
Same.
A screw and a spur gear.
Third class lever.
Positive mechanical advantage.

27. What is the second thing a gear can do?
When a resistance is overcome by a force acting through a measurable distance.
Mechanical disadvantage. Use more force than the force of the load you lift.
Increase or decrease the the speed of the applied motion.
Connects shafts having a 90 degree angle.

28. What direction does the effort and resistance move in third class levers.
Door knob.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Same.
Simple machine

29. How can you decrease friction on flat surfaces?
A modification of an inclined plane.
A screw and a spur gear.
With oil - grease or soap.
32/8 = 4

30. How can you figure out the mechanical advantage of most block and falls by glance?
Door knob.
32/8 = 4
Count the number of parts of the rope going to and from the movable block.
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.

31. How do you find the mechanical advantage?
2. Each half of the rope carries an equal amount of weight.
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.
In Horsepower.
When a resistance is overcome by a force acting through a measurable distance.

32. hat is a screw?
32/8 = 4
In pounds.
Power=Work/Time
A modification of an inclined plane.

33. What is another example of a wheel and axle?
To raise a house or other heavy machinery.
Door knob.
Gravity - Magnetism - Friction - Recoil
Same.

34. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Door knob.
In pounds.
Equals the weight of the object being hoisted.
2(pie)/pitch

35. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
Wheel and axle.
Opposite.
Connects shafts having a 90 degree angle.

36. What direction does the effort and resistance move in first class levers?
Opposite.
Simple machine
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

37. What is one type of second class lever?
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.
2(pie)/pitch
Wheel and axle.

38. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
To raise a house or other heavy machinery.
A few thousandths of an inch.
Wheel and axle.

39. Class two lever
Direction - speed or size of the force applied.
fulcrum- weight- effort
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.
Opposite.

40. What is another way to find the mechanical advantage of an inclined plane?
Can change the direction of motion.
Length of ramp/length of height from floor to truck
To speed up the motion of resistence.
Opposite.

41. What kind of machine is the inclined plane?
Simple machine
The rope that passes through your hands is greater than the distance that the load is raised.
your arm.
Increase or decrease the the speed of the applied motion.

42. What is the purpose of a third class lever?
2(pie)/pitch
When a resistance is overcome by a force acting through a measurable distance.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
To speed up the motion of resistence.

43. What are the 4 forces?
your arm.
Gravity - Magnetism - Friction - Recoil
The change of the direction of the pull.
2(pie)/pitch

44. Fractional mechanical advantage
your arm.
Mechanical disadvantage. Use more force than the force of the load you lift.
Magnify or reduce the force which you apply.
Wheel and axle.

45. How is force measured in work?
To raise a house or other heavy machinery.
Opposite.
Work=Force*Distance
In pounds.

46. The miter gear faces are beveled at what angle?
Count the number of parts of the rope going to and from the movable block.
45
To magnify the applied force.
Same.

47. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Positive mechanical advantage.
Wheel and axle.
To magnify the applied force.

48. 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?
fulcrum- weight- effort
32/8 = 4
Work=Force*Distance
2. Each half of the rope carries an equal amount of weight.

49. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Door knob.
The rope that passes through your hands is greater than the distance that the load is raised.
2. Each half of the rope carries an equal amount of weight.
Connects shafts having a 90 degree angle.

50. What direction does the effort and resistance move in the second class levers?
Shafts lying at any given angle.
Same.
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.