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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. hat is a screw?
A few thousandths of an inch.
2. Each half of the rope carries an equal amount of weight.
A modification of an inclined plane.
The rope that passes through your hands is greater than the distance that the load is raised.

2. The miter gear faces are beveled at what angle?
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.
45
fulcrum- weight- effort

3. What are first and third class levers used for?
To magnify the applied force.
Less than 1.
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.
32/8 = 4

4. What kind of machine is the inclined plane?
Shafts lying at any given angle.
Simple machine
To speed up the motion of resistence.
2. Each half of the rope carries an equal amount of weight.

5. What is the theoretical mechanical advantage of any gear train?
2. Each half of the rope carries an equal amount of weight.
Can change the direction of motion.
Mechanical disadvantage. Use more force than the force of the load you lift.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

6. How can you decrease friction on flat surfaces?
Power=Work/Time
A screw and a spur gear.
With oil - grease or soap.
Third class lever.

7. What is another way to find the mechanical advantage of an inclined plane?
The force used to overcome friction is greater than the force used to do useful work.
The rope that passes through your hands is greater than the distance that the load is raised.
Length of ramp/length of height from floor to truck
Less than 1.

8. Gears can do a job for you by changing what three things?
Equals the weight of the object being hoisted.
Direction - speed or size of the force applied.
Less than 1.
Positive mechanical advantage.

9. What direction does the effort and resistance move in the second class levers?
Same.
fulcrum- weight- effort
Magnify or reduce the force which you apply.
Count the number of parts of the rope going to and from the movable block.

10. How is distance measured in work?
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.
Feet.
A modification of an inclined plane.

11. With a single fixed sheave what is the only 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.
2(pie)/pitch
The change of the direction of the pull.
Count the number of parts of the rope going to and from the movable block.

12. What are the 4 forces?
Work=Force*Distance
Wheel and axle.
A modification of an inclined plane.
Gravity - Magnetism - Friction - Recoil

13. Work is measured in units also known as?
Wheel and axle.
your arm.
The force used to overcome friction is greater than the force used to do useful work.
Foot- pounds

14. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
The change of the direction of the pull.
Third class lever.
Can change the direction of motion.
Equals the weight of the object being hoisted.

15. How is force measured in work?
Increase or decrease the the speed of the applied motion.
A modification of an inclined plane.
45
In pounds.

16. The bevel gear is used to connect what?
Simple machine
Shafts lying at any given angle.
Feet.
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

17. What is the first thing a gear can do?
Connects shafts having a 90 degree angle.
Can change the direction of motion.
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 raise a house or other heavy machinery.

18. What direction does the effort and resistance move in third class levers.
2. Each half of the rope carries an equal amount of weight.
In Horsepower.
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.

19. 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?
In pounds.
Feet.
Same.
32/8 = 4

20. What does a micrometer measure?
Increase or decrease the the speed of the applied motion.
Opposite.
A few thousandths of an inch.
When a resistance is overcome by a force acting through a measurable distance.

21. What is an example of a third class lever?
your arm.
Feet.
Power=Work/Time
The force used to overcome friction is greater than the force used to do useful work.

22. 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
Increase or decrease the the speed of the applied motion.
The change of the direction of the pull.
The force used to overcome friction is greater than the force used to do useful work.

23. 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.
Direction - speed or size of the force applied.
To speed up the motion of resistence.
Mechanical disadvantage. Use more force than the force of the load you lift.

24. Formula for fractional mechanical disadvantage.
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
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Connects shafts having a 90 degree angle.
your arm.

25. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
Shafts lying at any given angle.
A modification of an inclined plane.
1

26. What is the mechanical advantage of a single movable block?
fulcrum- weight- effort
2. Each half of the rope carries an equal amount of weight.
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.

27. What kind of mechanical advantage does the first and second class lever provide?
Power=Work/Time
Positive mechanical advantage.
A few thousandths of an inch.
To speed up the motion of resistence.

28. What is the work formula?
Work=Force*Distance
In Horsepower.
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.

29. Friction is involved when?
32/8 = 4
To speed up the motion of resistence.
Two surfaces move against one another.
Opposite.

30. The threads of a screw are cut so?
fulcrum- weight- effort
The change of the direction of the pull.
Opposite.
The force used to overcome friction is greater than the force used to do useful work.

31. How can you figure out the mechanical advantage of most block and falls by glance?
To raise a house or other heavy machinery.
Two surfaces move against one another.
Count the number of parts of the rope going to and from the movable block.
Increase or decrease the the speed of the applied motion.

32. How is work done?
Less than 1.
Magnify or reduce the force which you apply.
Count the number of parts of the rope going to and from the movable block.
When a resistance is overcome by a force acting through a measurable distance.

33. How do you measure power?
In Horsepower.
your arm.
45
fulcrum- weight- effort

34. Class two lever
fulcrum- weight- effort
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Equals the weight of the object being hoisted.
Direction - speed or size of the force applied.

35. What direction does the effort and resistance move in first class levers?
Opposite.
To speed up the motion of resistence.
The force used to overcome friction is greater than the force used to do useful work.
Feet.

36. What is one type of second class lever?
Wheel and axle.
Same.
Direction - speed or size of the force applied.
A few thousandths of an inch.

37. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
A few thousandths of an inch.
Opposite.
When a resistance is overcome by a force acting through a measurable distance.

38. A miter gear connects what?
Connects shafts having a 90 degree angle.
To raise a house or other heavy machinery.
A screw and a spur gear.
Can change the direction of motion.

39. What is the lever formula?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Same.
Shafts lying at any given angle.
A few thousandths of an inch.

40. The worm gear is a combination of what?
Third class lever.
Opposite.
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.

41. What type of lever provides a fractional mechanical advantage?
Third class lever.
Door knob.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
1

42. What is the mechanical advantage for a single fixed block?
32/8 = 4
A modification of an inclined plane.
1
Positive mechanical advantage.

43. An egg beater has a mechanical advantage of what?
fulcrum- weight- effort
In pounds.
Less than 1.
Third class lever.

44. What is the ratio of any gear train?
2. Each half of the rope carries an equal amount of weight.
Increase or decrease the the speed of the applied motion.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Length of ramp/length of height from floor to truck

45. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
Foot- pounds
Mechanical disadvantage. Use more force than the force of the load you lift.
The rope that passes through your hands is greater than the distance that the load is raised.

46. What is the power formula?
Wheel and axle.
Power=Work/Time
fulcrum- weight- effort
Positive mechanical advantage.

47. How do you find the 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.
fulcrum- weight- effort
To magnify the applied force.
A modification of an inclined plane.

48. What is the third thing a gear can do?
Work=Force*Distance
Magnify or reduce the force which you apply.
Equals the weight of the object being hoisted.
Wheel and axle.

49. What is the jack screw used for?
45
Count the number of parts of the rope going to and from the movable block.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
To raise a house or other heavy machinery.

50. What is another example of a wheel and axle?
32/8 = 4
Door knob.
To speed up the motion of resistence.
Positive mechanical advantage.