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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 formula for the mechanical advantage of a screw?
A few thousandths of an inch.
2(pie)/pitch
Positive mechanical advantage.
Direction - speed or size of the force applied.

2. How is distance measured in work?
Length of ramp/length of height from floor to truck
Feet.
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.

3. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
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
Same.
Equals the weight of the object being hoisted.
Shafts lying at any given angle.

4. What are first and third class levers used for?
Feet.
To magnify the applied force.
Wheel and axle.
2. Each half of the rope carries an equal amount of weight.

5. What does a micrometer measure?
A modification of an inclined plane.
Door knob.
Length of ramp/length of height from floor to truck
A few thousandths of an inch.

6. An egg beater has a mechanical advantage of what?
your arm.
In pounds.
Feet.
Less than 1.

7. How is force measured in work?
To speed up the motion of resistence.
Mechanical disadvantage. Use more force than the force of the load you lift.
In pounds.
The rope that passes through your hands is greater than the distance that the load is raised.

8. Formula for fractional mechanical disadvantage.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Foot- pounds
When a resistance is overcome by a force acting through a measurable distance.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

9. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
To magnify the applied force.
The rope that passes through your hands is greater than the distance that the load is raised.
When a resistance is overcome by a force acting through a measurable distance.
With oil - grease or soap.

10. What is another way to find the mechanical advantage of an inclined plane?
In Horsepower.
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.
Wheel and axle.

11. What is the lever formula?
Work=Force*Distance
With oil - grease or soap.
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.

12. What is the power formula?
Can change the direction of motion.
Power=Work/Time
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.

13. What kind of machine is the inclined plane?
The rope that passes through your hands is greater than the distance that the load is raised.
1
In Horsepower.
Simple machine

14. 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
Simple machine
The rope that passes through your hands is greater than the distance that the load is raised.
Feet.

15. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
Positive mechanical advantage.
Increase or decrease the the speed of the applied motion.
Same.

16. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Connects shafts having a 90 degree angle.
Feet.
In Horsepower.

17. What are the 4 forces?
1
Gravity - Magnetism - Friction - Recoil
fulcrum- weight- effort
your arm.

18. What is the purpose of a third class lever?
To speed up the motion of resistence.
Wheel and axle.
Mechanical disadvantage. Use more force than the force of the load you lift.
Work=Force*Distance

19. What is the second thing a gear can do?
The rope that passes through your hands is greater than the distance that the load is raised.
Count the number of parts of the rope going to and from the movable block.
Foot- pounds
Increase or decrease the the speed of the applied motion.

20. What direction does the effort and resistance move in the second class levers?
Increase or decrease the the speed of the applied motion.
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.
Same.

21. The miter gear faces are beveled at what angle?
45
A screw and a spur gear.
Feet.
2. Each half of the rope carries an equal amount of weight.

22. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
Power=Work/Time
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Work=Force*Distance

23. With a single fixed sheave what is the only mechanical advantage?
Feet.
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.
The rope that passes through your hands is greater than the distance that the load is raised.

24. Friction is involved when?
Gravity - Magnetism - Friction - Recoil
Two surfaces move against one another.
Can change the direction of motion.
Work=Force*Distance

25. What is the jack screw used for?
Third class lever.
In pounds.
Direction - speed or size of the force applied.
To raise a house or other heavy machinery.

26. What kind of mechanical advantage does the first and second class lever provide?
Wheel and axle.
Shafts lying at any given angle.
Gravity - Magnetism - Friction - Recoil
Positive mechanical advantage.

27. The threads of a screw are cut so?
fulcrum- weight- effort
Can change the direction of motion.
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.

28. How is work done?
Increase or decrease the the speed of the applied motion.
2. Each half of the rope carries an equal amount of weight.
When a resistance is overcome by a force acting through a measurable distance.
Same.

29. What is the mechanical advantage for a single fixed block?
Work=Force*Distance
1
Shafts lying at any given angle.
The change of the direction of the pull.

30. What is the ratio of any gear train?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Two surfaces move against one another.
A few thousandths of an inch.
Gravity - Magnetism - Friction - Recoil

31. The bevel gear is used to connect what?
Positive mechanical advantage.
2. Each half of the rope carries an equal amount of weight.
Shafts lying at any given angle.
Direction - speed or size of the force applied.

32. A miter gear connects what?
Power=Work/Time
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
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.

33. How do you find the mechanical advantage?
The force used to overcome friction is greater than the force used to do useful work.
To magnify the applied force.
2. Each half of the rope carries an equal amount of weight.
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.

34. hat is a screw?
A modification of an inclined plane.
Connects shafts having a 90 degree angle.
Shafts lying at any given angle.
Can change the direction of motion.

35. What is the first thing a gear can do?
Same.
Can change the direction of motion.
Wheel and axle.
Mechanical disadvantage. Use more force than the force of the load you lift.

36. 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?
your arm.
32/8 = 4
Count the number of parts of the rope going to and from the movable block.
With oil - grease or soap.

37. Class two lever
Power=Work/Time
2. Each half of the rope carries an equal amount of weight.
fulcrum- weight- effort
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. What is another example of a wheel and axle?
Foot- pounds
Door knob.
Less than 1.
Count the number of parts of the rope going to and from the movable block.

39. Gears can do a job for you by changing what three things?
The rope that passes through your hands is greater than the distance that the load is raised.
Count the number of parts of the rope going to and from the movable block.
Equals the weight of the object being hoisted.
Direction - speed or size of the force applied.

40. What is the work formula?
Work=Force*Distance
Positive mechanical advantage.
Length of ramp/length of height from floor to truck
The rope that passes through your hands is greater than the distance that the load is raised.

41. What is the third thing a gear can do?
A modification of an inclined plane.
Connects shafts having a 90 degree angle.
Magnify or reduce the force which you apply.
Door knob.

42. What is one type of second class lever?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Wheel and axle.
Work=Force*Distance
Magnify or reduce the force which you apply.

43. Work is measured in units also known as?
Direction - speed or size of the force applied.
Feet.
Foot- pounds
Count the number of parts of the rope going to and from the movable block.

44. How can you figure out the mechanical advantage of most block and falls by glance?
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
Magnify or reduce the force which you apply.
Increase or decrease the the speed of the applied motion.
Count the number of parts of the rope going to and from the movable block.

45. What is an example of a third class lever?
Increase or decrease the the speed of the applied motion.
Connects shafts having a 90 degree angle.
your arm.
In pounds.

46. 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.
With oil - grease or soap.
When a resistance is overcome by a force acting through a measurable distance.
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

47. How do you measure power?
In Horsepower.
1
Connects shafts having a 90 degree angle.
45

48. What direction does the effort and resistance move in third class levers.
A screw and a spur gear.
2(pie)/pitch
Mechanical disadvantage. Use more force than the force of the load you lift.
Same.

49. 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
Feet.
Third class lever.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

50. The worm gear is a combination of what?
A modification of an inclined plane.
Can change the direction of motion.
A screw and a spur gear.
Third class lever.