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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 work formula?
Work=Force*Distance
Direction - speed or size of the force applied.
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.
Wheel and axle.

2. What is the lever formula?
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.
Work=Force*Distance
To speed up the motion of resistence.

3. What is an example of a third class lever?
your arm.
Positive mechanical advantage.
Third class lever.
Same.

4. What is the formula for the mechanical advantage of a screw?
Equals the weight of the object being hoisted.
2(pie)/pitch
fulcrum- weight- effort
Connects shafts having a 90 degree angle.

5. hat is a screw?
A modification of an inclined plane.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A screw and a spur gear.
Same.

6. The threads of a screw are cut so?
In pounds.
Increase or decrease the the speed of the applied motion.
The force used to overcome friction is greater than the force used to do useful work.
Same.

7. How is distance measured in work?
Mechanical disadvantage. Use more force than the force of the load you lift.
Shafts lying at any given angle.
Feet.
Same.

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

9. What are the 4 forces?
Work=Force*Distance
Shafts lying at any given angle.
Gravity - Magnetism - Friction - Recoil
fulcrum- weight- effort

10. What is one type of second class lever?
Wheel and axle.
Third class lever.
The force used to overcome friction is greater than the force used to do useful work.
your arm.

11. What is the purpose of a third class lever?
Foot- pounds
To speed up the motion of resistence.
Feet.
A few thousandths of an inch.

12. The miter gear faces are beveled at what angle?
Less than 1.
Simple machine
45
2(pie)/pitch

13. A miter gear connects what?
Door knob.
Same.
Connects shafts having a 90 degree angle.
Third class lever.

14. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
A few thousandths of an inch.
Connects shafts having a 90 degree angle.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

15. What direction does the effort and resistance move in the second class levers?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Foot- pounds
To speed up the motion of resistence.
Same.

16. With a single fixed sheave what is the only mechanical advantage?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
The change of the direction of the pull.
45
Equals the weight of the object being hoisted.

17. An egg beater has a mechanical advantage of what?
Direction - speed or size of the force applied.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Less than 1.
2. Each half of the rope carries an equal amount of weight.

18. What direction does the effort and resistance move in first class levers?
Opposite.
Same.
Door knob.
When a resistance is overcome by a force acting through a measurable distance.

19. What is the mechanical advantage for a single fixed 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.
fulcrum- weight- effort
1

20. 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?
Can change the direction of motion.
32/8 = 4
2(pie)/pitch
Opposite.

21. What direction does the effort and resistance move in third class levers.
Count the number of parts of the rope going to and from the movable block.
To magnify the applied force.
Same.
Power=Work/Time

22. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Less than 1.
45
Feet.

23. What are first and third class levers used for?
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.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
To magnify the applied force.
fulcrum- weight- effort

24. What is the power formula?
1
Wheel and axle.
Power=Work/Time
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

25. The worm gear is a combination of what?
The force used to overcome friction is greater than the force used to do useful work.
Magnify or reduce the force which you apply.
A screw and a spur gear.
fulcrum- weight- effort

26. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
45
Can change the direction of motion.
1
The rope that passes through your hands is greater than the distance that the load is raised.

27. How do you find the mechanical advantage?
The force used to overcome friction is greater than the force used to do useful work.
Foot- pounds
Positive mechanical advantage.
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 does a micrometer measure?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
A few thousandths of an inch.
Gravity - Magnetism - Friction - Recoil
2. Each half of the rope carries an equal amount of weight.

29. What is the second thing a gear can do?
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.
Increase or decrease the the speed of the applied motion.
32/8 = 4

30. What is the theoretical mechanical advantage of any gear train?
your arm.
Gravity - Magnetism - Friction - Recoil
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

31. What is the mechanical advantage of a single movable block?
Same.
fulcrum- weight- effort
2. Each half of the rope carries an equal amount of weight.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

32. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
Same.
Direction - speed or size of the force applied.
Two surfaces move against one another.

33. Formula for fractional mechanical disadvantage.
2(pie)/pitch
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.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

34. How can you figure out the mechanical advantage of most block and falls by glance?
your arm.
To speed up the motion of resistence.
Positive mechanical advantage.
Count the number of parts of the rope going to and from the movable block.

35. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
2. Each half of the rope carries an equal amount of weight.
Foot- pounds
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

36. 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.
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
Can change the direction of motion.
Opposite.

37. Class two lever
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
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.
fulcrum- weight- effort

38. What kind of machine is the inclined plane?
Magnify or reduce the force which you apply.
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.
Direction - speed or size of the force applied.
Simple machine

39. How is force measured in work?
In pounds.
Magnify or reduce the force which you apply.
Same.
The rope that passes through your hands is greater than the distance that the load is raised.

40. Gears can do a job for you by changing what three things?
1
Direction - speed or size of the force applied.
Door knob.
Two surfaces move against one another.

41. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
With oil - grease or soap.
A modification of an inclined plane.

42. How is work done?
The change of the direction of the pull.
Mechanical disadvantage. Use more force than the force of the load you lift.
Shafts lying at any given angle.
When a resistance is overcome by a force acting through a measurable distance.

43. What is the formula for the wheel and axle?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
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
In Horsepower.

44. What is another example of a wheel and axle?
Door knob.
your arm.
To speed up the motion of resistence.
Opposite.

45. What is the ratio of any gear train?
In pounds.
Connects shafts having a 90 degree angle.
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.

46. What is the jack screw used for?
To raise a house or other heavy machinery.
Gravity - Magnetism - Friction - Recoil
your arm.
The rope that passes through your hands is greater than the distance that the load is raised.

47. The bevel gear is used to connect what?
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.
Shafts lying at any given angle.
Less than 1.
When a resistance is overcome by a force acting through a measurable distance.

48. How do you measure power?
Equals the weight of the object being hoisted.
Third class lever.
Can change the direction of motion.
In Horsepower.

49. What type of lever provides a fractional mechanical advantage?
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.
Direction - speed or size of the force applied.
32/8 = 4
Third class lever.

50. Work is measured in units also known as?
Foot- pounds
In pounds.
Direction - speed or size of the force applied.
Equals the weight of the object being hoisted.