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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 are first and third class levers used for?
Less than 1.
To magnify the applied force.
Feet.
Two surfaces move against one another.

2. 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.
Opposite.
The force used to overcome friction is greater than the force used to do useful work.
Gravity - Magnetism - Friction - Recoil

3. What direction does the effort and resistance move in the second class levers?
Increase or decrease the the speed of the applied motion.
Same.
Shafts lying at any given angle.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

4. How is force measured in work?
In pounds.
Work=Force*Distance
In Horsepower.
Foot- pounds

5. The threads of a screw are cut so?
Direction - speed or size of the force applied.
A modification of an inclined plane.
The force used to overcome friction is greater than the force used to do useful work.
45

6. What is the work formula?
In Horsepower.
Wheel and axle.
Length of ramp/length of height from floor to truck
Work=Force*Distance

7. With a single fixed sheave what is the only mechanical advantage?
45
Foot- pounds
your arm.
The change of the direction of the pull.

8. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Shafts lying at any given angle.
fulcrum- weight- effort
With oil - grease or soap.

9. What direction does the effort and resistance move in first class levers?
your arm.
Opposite.
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.

10. How can you decrease friction on flat surfaces?
When a resistance is overcome by a force acting through a measurable distance.
A modification of an inclined plane.
Foot- pounds
With oil - grease or soap.

11. What is the power formula?
Door knob.
With oil - grease or soap.
A screw and a spur gear.
Power=Work/Time

12. What is the lever formula?
Door knob.
Positive mechanical advantage.
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
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

13. How do you measure power?
Simple machine
Mechanical disadvantage. Use more force than the force of the load you lift.
Direction - speed or size of the force applied.
In Horsepower.

14. 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.
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.
Gravity - Magnetism - Friction - Recoil

15. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
With oil - grease or soap.
1
Gravity - Magnetism - Friction - Recoil

16. What kind of machine is the inclined plane?
Simple machine
45
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.

17. How can you figure out the mechanical advantage of most block and falls by glance?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Connects shafts having a 90 degree angle.
Count the number of parts of the rope going to and from the movable block.
The force used to overcome friction is greater than the force used to do useful work.

18. What is an example of a third class lever?
Same.
32/8 = 4
your arm.
A screw and a spur gear.

19. hat is a screw?
A modification of an inclined plane.
To magnify the applied force.
When a resistance is overcome by a force acting through a measurable distance.
To raise a house or other heavy machinery.

20. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
The change of the direction of the pull.
The rope that passes through your hands is greater than the distance that the load is raised.
Same.
Wheel and axle.

21. The worm gear is a combination of what?
45
A screw and a spur gear.
Third class lever.
Shafts lying at any given angle.

22. An egg beater has a mechanical advantage of what?
1
Feet.
Less than 1.
Shafts lying at any given angle.

23. What is one type of second class lever?
Wheel and axle.
1
Positive mechanical advantage.
2(pie)/pitch

24. Gears can do a job for you by changing what three things?
Shafts lying at any given angle.
The change of the direction of the pull.
Direction - speed or size of the force applied.
Gravity - Magnetism - Friction - Recoil

25. Work is measured in units also known as?
32/8 = 4
Foot- pounds
Simple machine
Mechanical disadvantage. Use more force than the force of the load you lift.

26. What is another way to find the mechanical advantage of an inclined plane?
When a resistance is overcome by a force acting through a measurable distance.
Length of ramp/length of height from floor to truck
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.
A modification of an inclined plane.

27. How do you find the mechanical advantage?
Length of ramp/length of height from floor to truck
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.
A modification of an inclined plane.

28. Class two lever
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
In Horsepower.
To raise a house or other heavy machinery.

29. Fractional mechanical advantage
Foot- pounds
Mechanical disadvantage. Use more force than the force of the load you lift.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Wheel and axle.

30. Friction is involved when?
Count the number of parts of the rope going to and from the movable block.
Two surfaces move against one another.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Magnify or reduce the force which you apply.

31. What is the third thing a gear can do?
Simple machine
When a resistance is overcome by a force acting through a measurable distance.
Magnify or reduce the force which you apply.
To raise a house or other heavy machinery.

32. What is another example of a wheel and axle?
Door knob.
Can change the direction of motion.
1
Direction - speed or size of the force applied.

33. The bevel gear is used to connect what?
Shafts lying at any given angle.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
your arm.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

34. What is the mechanical advantage for a single fixed block?
Less than 1.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
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
1

35. What is the purpose of a third class lever?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
To speed up the motion of resistence.
Wheel and axle.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

36. What is the formula for the wheel and axle?
Increase or decrease the the speed of the applied motion.
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
Equals the weight of the object being hoisted.
With oil - grease or soap.

37. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
Simple machine
Gravity - Magnetism - Friction - Recoil
Opposite.

38. How is distance measured in work?
Wheel and axle.
Power=Work/Time
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Feet.

39. What is the theoretical mechanical advantage of any gear train?
Shafts lying at any given angle.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Door knob.
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.

40. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
The force used to overcome friction is greater than the force used to do useful work.
When a resistance is overcome by a force acting through a measurable distance.
Door knob.

41. 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 raise a house or other heavy machinery.
Equals the weight of the object being hoisted.
A screw and a spur gear.

42. What is the jack screw used for?
Gravity - Magnetism - Friction - Recoil
Increase or decrease the the speed of the applied motion.
Shafts lying at any given angle.
To raise a house or other heavy machinery.

43. The miter gear faces are beveled at what angle?
45
To magnify the applied force.
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.

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

45. How is work done?
Gravity - Magnetism - Friction - Recoil
To raise a house or other heavy machinery.
When a resistance is overcome by a force acting through a measurable distance.
Work=Force*Distance

46. What direction does the effort and resistance move in third class levers.
1
Can change the direction of motion.
With oil - grease or soap.
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.
Third class lever.
Work=Force*Distance
A modification of an inclined plane.

48. What does a micrometer measure?
Feet.
Foot- pounds
A few thousandths of an inch.
Work=Force*Distance

49. What is the first thing a gear can do?
45
Can change the direction of motion.
Count the number of parts of the rope going to and from the movable block.
Foot- pounds

50. A miter gear connects what?
your arm.
Mechanical disadvantage. Use more force than the force of the load you lift.
A modification of an inclined plane.
Connects shafts having a 90 degree angle.