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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 one type of second class lever?
Wheel and axle.
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
A few thousandths of an inch.

2. What are the 4 forces?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Mechanical disadvantage. Use more force than the force of the load you lift.
Increase or decrease the the speed of the applied motion.
Gravity - Magnetism - Friction - Recoil

3. A miter gear connects what?
2. Each half of the rope carries an equal amount of weight.
Count the number of parts of the rope going to and from the movable block.
Connects shafts having a 90 degree angle.
A modification of an inclined plane.

4. How is force measured in work?
To magnify the applied force.
Increase or decrease the the speed of the applied motion.
1
In pounds.

5. An egg beater has a mechanical advantage of what?
Can change the direction of motion.
2. Each half of the rope carries an equal amount of weight.
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.

6. 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.
Two surfaces move against one another.
A screw and a spur gear.
Opposite.

7. How is work done?
Simple machine
With oil - grease or soap.
fulcrum- weight- effort
When a resistance is overcome by a force acting through a measurable distance.

8. What direction does the effort and resistance move in first class levers?
32/8 = 4
Equals the weight of the object being hoisted.
In pounds.
Opposite.

9. What kind of mechanical advantage does the first and second class lever provide?
A few thousandths of an inch.
Shafts lying at any given angle.
Power=Work/Time
Positive mechanical advantage.

10. How can you decrease friction on flat surfaces?
With oil - grease or soap.
45
A few thousandths of an inch.
Foot- pounds

11. What is the theoretical mechanical advantage of any gear train?
Wheel and axle.
Simple machine
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.

12. What is the work formula?
Gravity - Magnetism - Friction - Recoil
Work=Force*Distance
Same.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

13. 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.
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.
To magnify the applied force.

14. Friction is involved when?
Less than 1.
your arm.
Two surfaces move against one another.
With oil - grease or soap.

15. The miter gear faces are beveled at what angle?
The force used to overcome friction is greater than the force used to do useful work.
45
Length of ramp/length of height from floor to truck
Work=Force*Distance

16. What is the mechanical advantage for a single fixed block?
Opposite.
Mechanical disadvantage. Use more force than the force of the load you lift.
1
Third class lever.

17. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
To speed up the motion of resistence.
The rope that passes through your hands is greater than the distance that the load is raised.
Increase or decrease the the speed of the applied 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.

18. What is the purpose of a third class lever?
fulcrum- weight- effort
Gravity - Magnetism - Friction - Recoil
Increase or decrease the the speed of the applied motion.
To speed up the motion of resistence.

19. What is the jack screw used for?
To raise a house or other heavy machinery.
1
Same.
Door knob.

20. What is the formula for the mechanical advantage of a screw?
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.
2(pie)/pitch
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

21. The worm gear is a combination of what?
A screw and a spur gear.
To speed up the motion of resistence.
Can change the direction of motion.
Wheel and axle.

22. What is the first thing a gear can do?
Can change the direction of motion.
Foot- pounds
In pounds.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

23. What direction does the effort and resistance move in the second class levers?
Count the number of parts of the rope going to and from the movable block.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
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

24. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
Connects shafts having a 90 degree angle.
Less than 1.
Shafts lying at any given angle.

25. What is an example of a third class lever?
Connects shafts having a 90 degree angle.
32/8 = 4
Direction - speed or size of the force applied.
your arm.

26. With a single fixed sheave what is the only mechanical advantage?
Third class lever.
The change of the direction of the pull.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
The rope that passes through your hands is greater than the distance that the load is raised.

27. Class two lever
Opposite.
Two surfaces move against one another.
fulcrum- weight- effort
Can change the direction of motion.

28. What direction does the effort and resistance move in third class levers.
To magnify the applied force.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Same.
The rope that passes through your hands is greater than the distance that the load is raised.

29. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
Length of ramp/length of height from floor to truck
Increase or decrease the the speed of the applied motion.
The change of the direction of the pull.

30. How do you find the mechanical advantage?
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.
45
Third class lever.

31. What is the ratio of any gear train?
Equals the weight of the object being hoisted.
Magnify or reduce the force which you apply.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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. What is the lever formula?
Two surfaces move against one another.
2. Each half of the rope carries an equal amount of weight.
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.

33. Work is measured in units also known as?
Can change the direction of motion.
Shafts lying at any given angle.
Foot- pounds
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?
Can change the direction of motion.
Wheel and axle.
Shafts lying at any given angle.
fulcrum- weight- effort

35. What is the third thing a gear can do?
In pounds.
45
Magnify or reduce the force which you apply.
A few thousandths of an inch.

36. 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
Power=Work/Time
Mechanical disadvantage. Use more force than the force of the load you lift.
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.

37. What is another example of a wheel and axle?
Foot- pounds
Direction - speed or size of the force applied.
Door knob.
Can change the direction of motion.

38. hat is a screw?
When a resistance is overcome by a force acting through a measurable distance.
A modification of an inclined plane.
Equals the weight of the object being hoisted.
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.

39. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
A modification of an inclined plane.
Equals the weight of the object being hoisted.
Mechanical disadvantage. Use more force than the force of the load you lift.

40. What kind of machine is the inclined plane?
1
To magnify the applied force.
The change of the direction of the pull.
Simple machine

41. Formula for fractional mechanical disadvantage.
Simple machine
A screw and a spur gear.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A modification of an inclined plane.

42. What type of lever provides a fractional mechanical advantage?
Mechanical disadvantage. Use more force than the force of the load you lift.
To raise a house or other heavy machinery.
Third class lever.
The rope that passes through your hands is greater than the distance that the load is raised.

43. What does a micrometer measure?
The rope that passes through your hands is greater than the distance that the load is raised.
A few thousandths of an inch.
Connects shafts having a 90 degree angle.
To magnify the applied force.

44. Fractional mechanical advantage
When a resistance is overcome by a force acting through a measurable distance.
A screw and a spur gear.
1
Mechanical disadvantage. Use more force than the force of the load you lift.

45. How do you measure power?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
In Horsepower.
Work=Force*Distance
Feet.

46. 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.
Shafts lying at any given angle.
Connects shafts having a 90 degree angle.
Simple machine

47. Gears can do a job for you by changing what three things?
The change of the direction of the pull.
A screw and a spur gear.
fulcrum- weight- effort
Direction - speed or size of the force applied.

48. What is the power formula?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
The change of the direction of the pull.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Power=Work/Time

49. How is distance measured in work?
Wheel and axle.
your arm.
Feet.
Positive mechanical advantage.

50. What are first and third class levers used for?
45
1
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
To magnify the applied force.