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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 mechanical advantage for a single fixed block?
1
Increase or decrease the the speed of the applied motion.
When a resistance is overcome by a force acting through a measurable distance.
Less than 1.

2. How is work done?
Third class lever.
Simple machine
your arm.
When a resistance is overcome by a force acting through a measurable distance.

3. What is the third thing a gear can do?
2. Each half of the rope carries an equal amount of weight.
Length of ramp/length of height from floor to truck
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.

4. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
To raise a house or other heavy machinery.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
fulcrum- weight- effort

5. hat is a screw?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A modification of an inclined plane.
Less than 1.
To magnify the applied force.

6. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
2(pie)/pitch
A modification of an inclined plane.
Equals the weight of the object being hoisted.

7. What is the second thing a gear can do?
Mechanical disadvantage. Use more force than the force of the load you lift.
Feet.
Increase or decrease the the speed of the applied motion.
fulcrum- weight- effort

8. 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
Length of ramp/length of height from floor to truck
fulcrum- weight- effort
Direction - speed or size of the force applied.

9. How do you measure power?
45
The rope that passes through your hands is greater than the distance that the load is raised.
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.

10. How is distance measured in work?
2(pie)/pitch
Feet.
Power=Work/Time
Positive mechanical advantage.

11. What is another way to find the mechanical advantage of an inclined plane?
With oil - grease or soap.
1
Connects shafts having a 90 degree angle.
Length of ramp/length of height from floor to truck

12. What is one type of second class lever?
Opposite.
Wheel and axle.
With oil - grease or soap.
The force used to overcome friction is greater than the force used to do useful work.

13. What is the work formula?
Work=Force*Distance
Third class lever.
To magnify the applied force.
Same.

14. The threads of a screw are cut so?
Gravity - Magnetism - Friction - Recoil
The change of the direction of the pull.
Foot- pounds
The force used to overcome friction is greater than the force used to do useful work.

15. What are first and third class levers used for?
In pounds.
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.
Increase or decrease the the speed of the applied motion.

16. An egg beater has a mechanical advantage of what?
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
Less than 1.
Mechanical disadvantage. Use more force than the force of the load you lift.
45

17. Friction is involved when?
Length of ramp/length of height from floor to truck
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.
Two surfaces move against one another.

18. What is the purpose of a third class lever?
The force used to overcome friction is greater than the force used to do useful work.
Third class lever.
To speed up the motion of resistence.
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.

19. What direction does the effort and resistance move in the second class levers?
1
Same.
To magnify the applied force.
Mechanical disadvantage. Use more force than the force of the load you lift.

20. What kind of machine is the inclined plane?
Mechanical disadvantage. Use more force than the force of the load you lift.
Simple machine
The change of the direction of the pull.
Positive mechanical advantage.

21. A miter gear connects what?
Wheel and axle.
Connects shafts having a 90 degree angle.
Work=Force*Distance
To raise a house or other heavy machinery.

22. Class two lever
The force used to overcome friction is greater than the force used to do useful work.
fulcrum- weight- effort
Less than 1.
Equals the weight of the object being hoisted.

23. Fractional mechanical advantage
A few thousandths of an inch.
Mechanical disadvantage. Use more force than the force of the load you lift.
When a resistance is overcome by a force acting through a measurable distance.
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.

24. What is the lever formula?
Opposite.
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.
fulcrum- weight- effort

25. Work is measured in units also known as?
Feet.
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.
Foot- pounds

26. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Two surfaces move against one another.
Positive mechanical advantage.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Equals the weight of the object being hoisted.

27. What type of lever provides a fractional 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
Direction - speed or size of the force applied.
Third 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.

28. What is an example of a third class lever?
Mechanical disadvantage. Use more force than the force of the load you lift.
Same.
your arm.
Count the number of parts of the rope going to and from the movable block.

29. 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?
Foot- pounds
32/8 = 4
A screw and a spur gear.
The change of the direction of the pull.

30. Formula for fractional mechanical disadvantage.
2(pie)/pitch
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Equals the weight of the object being hoisted.
The change of the direction of the pull.

31. What is the jack screw used for?
Opposite.
To raise a house or other heavy machinery.
Power=Work/Time
Can change the direction of motion.

32. What is the theoretical mechanical advantage of any gear train?
Less than 1.
Third class lever.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

33. 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.
Power=Work/Time
your arm.
Increase or decrease the the speed of the applied motion.

34. With a single fixed sheave what is the only mechanical advantage?
fulcrum- weight- effort
1
2. Each half of the rope carries an equal amount of weight.
The change of the direction of the pull.

35. 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.
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 change of the direction of the pull.

36. What is the mechanical advantage of a single movable block?
Positive mechanical advantage.
fulcrum- weight- effort
2. Each half of the rope carries an equal amount of weight.
Two surfaces move against one another.

37. How is force measured in work?
In pounds.
2(pie)/pitch
The force used to overcome friction is greater than the force used to do useful work.
Simple machine

38. What is the formula for the mechanical advantage of a screw?
Simple machine
2(pie)/pitch
Work=Force*Distance
Two surfaces move against one another.

39. How do you find the mechanical advantage?
Count the number of parts of the rope going to and from the movable block.
The change of the direction of the pull.
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.

40. How can you decrease friction on flat surfaces?
Connects shafts having a 90 degree angle.
Foot- pounds
With oil - grease or soap.
Gravity - Magnetism - Friction - Recoil

41. What is the ratio of any gear train?
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
Feet.
Direction - speed or size of the force applied.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

42. The miter gear faces are beveled at what angle?
45
Direction - speed or size of the force applied.
Positive mechanical advantage.
Opposite.

43. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Opposite.
The rope that passes through your hands is greater than the distance that the load is raised.
Gravity - Magnetism - Friction - Recoil
With oil - grease or soap.

44. What direction does the effort and resistance move in first class levers?
Increase or decrease the the speed of the applied motion.
fulcrum- weight- effort
Opposite.
Work=Force*Distance

45. The worm gear is a combination of what?
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.
Foot- pounds
A screw and a spur gear.

46. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
Opposite.
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.

47. What direction does the effort and resistance move in third class levers.
A screw and a spur gear.
Same.
In pounds.
In Horsepower.

48. What is another example of a wheel and axle?
Same.
Door knob.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
The change of the direction of the pull.

49. The bevel gear is used to connect what?
1
Shafts lying at any given angle.
Connects shafts having a 90 degree angle.
To raise a house or other heavy machinery.

50. What is the first thing a gear can do?
Can change the direction of motion.
1
fulcrum- weight- effort
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.