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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.
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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.
Shafts lying at any given angle.
In pounds.
To raise a house or other heavy machinery.

2. What direction does the effort and resistance move in third class levers.
2. Each half of the rope carries an equal amount of weight.
Same.
Work=Force*Distance
To raise a house or other heavy machinery.

3. What is the purpose of a third class lever?
32/8 = 4
To speed up the motion of resistence.
A screw and a spur gear.
Connects shafts having a 90 degree angle.

4. 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.
In Horsepower.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
1

5. Class two lever
Increase or decrease the the speed of the applied motion.
fulcrum- weight- effort
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
When a resistance is overcome by a force acting through a measurable distance.

6. What is the mechanical advantage of a single movable block?
Wheel and axle.
Equals the weight of the object being hoisted.
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
2. Each half of the rope carries an equal amount of weight.

7. What is the formula for the wheel and axle?
To magnify the applied force.
Direction - speed or size of the force applied.
A modification of an inclined plane.
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

8. How is distance measured in work?
Count the number of parts of the rope going to and from the movable block.
Magnify or reduce the force which you apply.
Feet.
32/8 = 4

9. Formula for fractional mechanical disadvantage.
With oil - grease or soap.
Feet.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Direction - speed or size of the force applied.

10. Friction is involved when?
With oil - grease or soap.
2. Each half of the rope carries an equal amount of weight.
Two surfaces move against one another.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

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

12. What are the 4 forces?
Less than 1.
2. Each half of the rope carries an equal amount of weight.
Gravity - Magnetism - Friction - Recoil
A screw and a spur gear.

13. How can you decrease friction on flat surfaces?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Mechanical disadvantage. Use more force than the force of the load you lift.
With oil - grease or soap.
1

14. 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.
Increase or decrease the the speed of the applied motion.
Connects shafts having a 90 degree angle.
Two surfaces move against one another.

15. With a single fixed sheave what is the only mechanical advantage?
Opposite.
Increase or decrease the the speed of the applied motion.
your arm.
The change of the direction of the pull.

16. What is an example of a third class lever?
Work=Force*Distance
your arm.
32/8 = 4
Feet.

17. An egg beater has a mechanical advantage of what?
Mechanical disadvantage. Use more force than the force of the load you lift.
Foot- pounds
Less than 1.
Simple machine

18. What direction does the effort and resistance move in first class levers?
Count the number of parts of the rope going to and from the movable block.
32/8 = 4
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Opposite.

19. The worm gear is a combination of what?
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.
A screw and a spur gear.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

20. How is force measured in work?
The change of the direction of the pull.
In pounds.
Length of ramp/length of height from floor to truck
32/8 = 4

21. 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.
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.
Feet.

22. How can you figure out the mechanical advantage of most block and falls by glance?
Equals the weight of the object being hoisted.
Count the number of parts of the rope going to and from the movable block.
In pounds.
The change of the direction of the pull.

23. What is the work formula?
In pounds.
Work=Force*Distance
Third class lever.
To magnify the applied force.

24. What kind of machine is the inclined plane?
Less than 1.
Simple machine
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.

25. hat is a screw?
In pounds.
Mechanical disadvantage. Use more force than the force of the load you lift.
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 modification of an inclined plane.

26. How do you find the mechanical advantage?
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.
To speed up the motion of resistence.
Equals the weight of the object being hoisted.

27. What is the third thing a gear can do?
Direction - speed or size of the force applied.
Magnify or reduce the force which you apply.
Simple machine
Same.

28. What are first and third class levers used for?
A screw and a spur gear.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Length of ramp/length of height from floor to truck
To magnify the applied force.

29. How do you measure power?
Two surfaces move against one another.
In Horsepower.
In pounds.
your arm.

30. What is the lever formula?
The force used to overcome friction is greater than the force used to do useful work.
45
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Same.

31. The bevel gear is used to connect what?
your arm.
2(pie)/pitch
1
Shafts lying at any given angle.

32. Work is measured in units also known as?
A modification of an inclined plane.
Foot- pounds
Two surfaces move against one another.
Count the number of parts of the rope going to and from the movable block.

33. What is the first thing a gear can do?
Can change the direction of motion.
Third class lever.
Simple machine
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

34. What is another way to find the mechanical advantage of an inclined plane?
45
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Length of ramp/length of height from floor to truck
Mechanical disadvantage. Use more force than the force of the load you lift.

35. What does a micrometer measure?
Equals the weight of the object being hoisted.
A few thousandths of an inch.
Opposite.
Count the number of parts of the rope going to and from the movable block.

36. What is the formula for the mechanical advantage of a screw?
Magnify or reduce the force which you apply.
2(pie)/pitch
your arm.
The rope that passes through your hands is greater than the distance that the load is raised.

37. What is another example of a wheel and axle?
A few thousandths of an inch.
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
Door knob.

38. The threads of a screw are cut so?
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.
Work=Force*Distance
Third class lever.

39. The miter gear faces are beveled at what 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.
To speed up the motion of resistence.
When a resistance is overcome by a force acting through a measurable distance.
45

40. What is the second thing a gear can do?
The force used to overcome friction is greater than the force used to do useful work.
Increase or decrease the the speed of the applied motion.
Direction - speed or size of the force applied.
Length of ramp/length of height from floor to truck

41. A miter gear connects what?
In Horsepower.
32/8 = 4
Power=Work/Time
Connects shafts having a 90 degree angle.

42. What is one type of second class lever?
In Horsepower.
Door knob.
The change of the direction of the pull.
Wheel and axle.

43. How is work done?
Increase or decrease the the speed of the applied motion.
When a resistance is overcome by a force acting through a measurable distance.
To magnify the applied force.
Feet.

44. What kind of mechanical advantage does the first and second class lever provide?
Count the number of parts of the rope going to and from the movable block.
In Horsepower.
Gravity - Magnetism - Friction - Recoil
Positive mechanical advantage.

45. 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
Connects shafts having a 90 degree angle.
Third class lever.
Mechanical disadvantage. Use more force than the force of the load you lift.

46. Fractional mechanical advantage
Less than 1.
A screw and a spur gear.
Mechanical disadvantage. Use more force than the force of the load you lift.
Two surfaces move against one another.

47. What direction does the effort and resistance move in the second class levers?
Work=Force*Distance
Same.
In Horsepower.
Shafts lying at any given angle.

48. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Can change the direction of motion.
1
Equals the weight of the object being hoisted.
Less than 1.

49. 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.
Opposite.
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.

50. What type of lever provides a fractional mechanical advantage?
Positive mechanical advantage.
In pounds.
Third class lever.
The rope that passes through your hands is greater than the distance that the load is raised.