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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 type of lever provides a fractional mechanical advantage?
2. Each half of the rope carries an equal amount of weight.
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.
Third class lever.

2. What is the power formula?
your arm.
Power=Work/Time
When a resistance is overcome by a force acting through a measurable distance.
Same.

3. What is the theoretical mechanical advantage of any gear train?
Wheel and axle.
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.
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.

4. How is force measured in work?
Increase or decrease the the speed of the applied motion.
fulcrum- weight- effort
In pounds.
Can change the direction of motion.

5. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
32/8 = 4
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. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
A screw and a spur gear.
Direction - speed or size of the force applied.
Equals the weight of the object being hoisted.

7. With a single fixed sheave what is the only mechanical advantage?
1
The change of the direction of the pull.
To raise a house or other heavy machinery.
Magnify or reduce the force which you apply.

8. What is the third thing a gear can do?
In pounds.
The force used to overcome friction is greater than the force used to do useful work.
your arm.
Magnify or reduce the force which you apply.

9. What direction does the effort and resistance move in third class levers.
32/8 = 4
Same.
Third class lever.
Can change the direction of motion.

10. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
The force used to overcome friction is greater than the force used to do useful work.
Equals the weight of the object being hoisted.
Mechanical disadvantage. Use more force than the force of the load you lift.

11. The bevel gear is used to connect what?
When a resistance is overcome by a force acting through a measurable distance.
Shafts lying at any given angle.
To magnify the applied force.
Magnify or reduce the force which you apply.

12. What is the formula for the wheel and axle?
With oil - grease or soap.
fulcrum- weight- 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
Third class lever.

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?
32/8 = 4
To magnify the applied force.
To raise a house or other heavy machinery.
Same.

14. What is the lever formula?
Positive mechanical advantage.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
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 the driven gears/ divided by the product of the number of teeth on the driver gears.

15. What is the mechanical advantage for a single fixed block?
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.
Can change the direction of motion.
1

16. What is the mechanical advantage of a single movable block?
Less than 1.
your arm.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
2. Each half of the rope carries an equal amount of weight.

17. 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.
Foot- pounds
Same.
Can change the direction of motion.

18. What is the ratio of any gear train?
1
Opposite.
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.

19. Class two lever
Wheel and axle.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Magnify or reduce the force which you apply.
fulcrum- weight- effort

20. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
Increase or decrease the the speed of the applied motion.
Equals the weight of the object being hoisted.
To speed up the motion of resistence.

21. What does a micrometer measure?
Door knob.
A few thousandths of an inch.
2(pie)/pitch
Shafts lying at any given angle.

22. How do you find the mechanical advantage?
Feet.
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.
Foot- pounds

23. The worm gear is a combination 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
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Door knob.
A screw and a spur gear.

24. How can you figure out the mechanical advantage of most block and falls by glance?
45
Direction - speed or size of the force applied.
Count the number of parts of the rope going to and from the movable block.
A screw and a spur gear.

25. Friction is involved when?
Two surfaces move against one another.
A screw and a spur gear.
Length of ramp/length of height from floor to truck
The force used to overcome friction is greater than the force used to do useful work.

26. How do you measure power?
Wheel and axle.
The change of the direction of the pull.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
In Horsepower.

27. hat is a screw?
45
Third class lever.
A modification of an inclined plane.
Two surfaces move against one another.

28. What is the formula for the mechanical advantage of a screw?
The change of the direction of the pull.
A few thousandths of an inch.
1
2(pie)/pitch

29. What is the work formula?
Work=Force*Distance
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
2(pie)/pitch
45

30. A miter gear connects what?
Connects shafts having a 90 degree angle.
Power=Work/Time
Direction - speed or size of the force applied.
1

31. What are first and third class levers used for?
fulcrum- weight- effort
Less than 1.
To magnify the applied force.
To raise a house or other heavy machinery.

32. What is an example of a third class lever?
2. Each half of the rope carries an equal amount of weight.
Positive mechanical advantage.
your arm.
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?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Can change the direction of motion.
2(pie)/pitch
Gravity - Magnetism - Friction - Recoil

34. What is the jack screw used for?
Length of ramp/length of height from floor to truck
To raise a house or other heavy machinery.
2(pie)/pitch
Wheel and axle.

35. 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.
Equals the weight of the object being hoisted.
Opposite.
Mechanical disadvantage. Use more force than the force of the load you lift.

36. How is distance measured in work?
Same.
Less than 1.
your arm.
Feet.

37. An egg beater has a mechanical advantage of what?
Can change the direction of motion.
Less than 1.
A modification of an inclined plane.
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.

38. Gears can do a job for you by changing what three things?
Less than 1.
Direction - speed or size of the force applied.
45
fulcrum- weight- effort

39. Work is measured in units also known as?
The rope that passes through your hands is greater than the distance that the load is raised.
Can change the direction of motion.
Increase or decrease the the speed of the applied motion.
Foot- pounds

40. What direction does the effort and resistance move in first class levers?
Opposite.
Less than 1.
To speed up the motion of resistence.
A screw and a spur gear.

41. What kind of machine is the inclined plane?
Simple machine
Length of ramp/length of height from floor to truck
In Horsepower.
fulcrum- weight- effort

42. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
2. Each half of the rope carries an equal amount of weight.
Same.
To raise a house or other heavy machinery.

43. How is work done?
In pounds.
When a resistance is overcome by a force acting through a measurable distance.
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 force used to overcome friction is greater than the force used to do useful work.

44. What is one type of second class lever?
fulcrum- weight- effort
A screw and a spur gear.
Wheel and axle.
Foot- pounds

45. What is the second thing a gear can do?
Opposite.
Equals the weight of the object being hoisted.
32/8 = 4
Increase or decrease the the speed of the applied motion.

46. What is another example of a wheel and axle?
The change of the direction of the pull.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Mechanical disadvantage. Use more force than the force of the load you lift.
Door knob.

47. How can you decrease friction on flat surfaces?
Magnify or reduce the force which you apply.
45
The rope that passes through your hands is greater than the distance that the load is raised.
With oil - grease or soap.

48. What is the purpose of a third class lever?
To raise a house or other heavy machinery.
Positive mechanical advantage.
To speed up the motion of resistence.
With oil - grease or soap.

49. The miter gear faces are beveled at what angle?
With oil - grease or soap.
45
2(pie)/pitch
Length of ramp/length of height from floor to truck

50. What direction does the effort and resistance move in the second class levers?
When a resistance is overcome by a force acting through a measurable distance.
Same.
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.