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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 purpose of a third class lever?
your arm.
32/8 = 4
To speed up the motion of resistence.
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.

2. What is another way to find the mechanical advantage of an inclined plane?
Power=Work/Time
Foot- pounds
Length of ramp/length of height from floor to truck
Direction - speed or size of the force applied.

3. The miter gear faces are beveled at what angle?
45
In pounds.
Work=Force*Distance
Count the number of parts of the rope going to and from the movable block.

4. What direction does the effort and resistance move in third class levers.
Same.
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.
With oil - grease or soap.

5. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Two surfaces move against one another.
fulcrum- weight- effort
The rope that passes through your hands is greater than the distance that the load is raised.

6. Gears can do a job for you by changing what three things?
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
Door knob.
Mechanical disadvantage. Use more force than the force of the load you lift.
Direction - speed or size of the force applied.

7. What is the work formula?
Work=Force*Distance
2(pie)/pitch
When a resistance is overcome by a force acting through a measurable distance.
Opposite.

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

9. How do you measure power?
Count the number of parts of the rope going to and from the movable block.
A screw and a spur gear.
A few thousandths of an inch.
In Horsepower.

10. Fractional mechanical advantage
Magnify or reduce the force which you apply.
Opposite.
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.

11. 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?
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.
32/8 = 4
Wheel and axle.

12. What is an example of a third class lever?
your arm.
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
Count the number of parts of the rope going to and from the movable 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.

13. What is the third thing a gear can do?
To raise a house or other heavy machinery.
Can change the direction of motion.
Feet.
Magnify or reduce the force which you apply.

14. What is the power formula?
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.
Power=Work/Time
Same.

15. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
Same.
A modification of an inclined plane.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

16. How do you find the mechanical advantage?
In Horsepower.
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.
Gravity - Magnetism - Friction - Recoil

17. 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.
Wheel and axle.
Work=Force*Distance
In Horsepower.

18. How can you figure out the mechanical advantage of most block and falls by glance?
45
Count the number of parts of the rope going to and from the movable block.
Magnify or reduce the force which you apply.
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

19. What is another example of a wheel and axle?
Door knob.
Direction - speed or size of the force applied.
When a resistance is overcome by a force acting through a measurable distance.
Two surfaces move against one another.

20. What is the formula for the wheel and axle?
Direction - speed or size of the force applied.
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
Foot- pounds
Less than 1.

21. What is the theoretical mechanical advantage of any gear train?
2(pie)/pitch
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
To magnify the applied force.
Less than 1.

22. An egg beater has a mechanical advantage of what?
When a resistance is overcome by a force acting through a measurable distance.
Magnify or reduce the force which you apply.
Less than 1.
2. Each half of the rope carries an equal amount of weight.

23. What kind of mechanical advantage does the first and second class lever provide?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
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.
Positive mechanical advantage.

24. What direction does the effort and resistance move in first class levers?
When a resistance is overcome by a force acting through a measurable distance.
In pounds.
Opposite.
To magnify the applied force.

25. What direction does the effort and resistance move in the second class levers?
Magnify or reduce the force which you apply.
Door knob.
fulcrum- weight- effort
Same.

26. What is the ratio of any gear train?
Gravity - Magnetism - Friction - Recoil
To raise a house or other heavy machinery.
Power=Work/Time
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

27. A miter gear connects what?
To raise a house or other heavy machinery.
The change of the direction of the pull.
Connects shafts having a 90 degree angle.
fulcrum- weight- effort

28. The bevel gear is used to connect what?
Magnify or reduce the force which you apply.
With oil - grease or soap.
Shafts lying at any given angle.
In Horsepower.

29. What is the mechanical advantage for a single fixed block?
Increase or decrease the the speed of the applied motion.
Shafts lying at any given angle.
1
In Horsepower.

30. What is the jack screw used for?
To raise a house or other heavy machinery.
Feet.
Work=Force*Distance
Simple machine

31. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
Same.
The force used to overcome friction is greater than the force used to do useful work.
1

32. The worm gear is a combination of what?
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 rope that passes through your hands is greater than the distance that the load is raised.
Direction - speed or size of the force applied.
A screw and a spur gear.

33. Class two lever
45
A modification of an inclined plane.
fulcrum- weight- effort
Magnify or reduce the force which you apply.

34. What type of lever provides a fractional mechanical advantage?
Mechanical disadvantage. Use more force than the force of the load you lift.
Shafts lying at any given angle.
Third class lever.
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.

35. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
To speed up the motion of resistence.
Gravity - Magnetism - Friction - Recoil
Equals the weight of the object being hoisted.
With oil - grease or soap.

36. hat is a screw?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Door knob.
A modification of an inclined plane.
Connects shafts having a 90 degree angle.

37. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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 each of the driver gears/ divided by the product of number of teeth of the driven gear.
Third class lever.

38. How is force measured in work?
In pounds.
The rope that passes through your hands is greater than the distance that the load is raised.
Simple machine
The force used to overcome friction is greater than the force used to do useful work.

39. Friction is involved when?
Two surfaces move against one another.
Less than 1.
A few thousandths of an inch.
Mechanical disadvantage. Use more force than the force of the load you lift.

40. What is one type of second class lever?
Wheel and axle.
fulcrum- weight- effort
Power=Work/Time
To magnify the applied force.

41. What are first and third class levers used for?
Third class lever.
Foot- pounds
To magnify the applied force.
Simple machine

42. What are the 4 forces?
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.
Gravity - Magnetism - Friction - Recoil
To raise a house or other heavy machinery.

43. What is the formula for the mechanical advantage of a screw?
When a resistance is overcome by a force acting through a measurable distance.
Equals the weight of the object being hoisted.
fulcrum- weight- effort
2(pie)/pitch

44. How can you decrease friction on flat surfaces?
45
With oil - grease or soap.
1
A few thousandths of an inch.

45. How is distance measured in work?
2. Each half of the rope carries an equal amount of weight.
Feet.
To magnify the applied force.
Same.

46. What is the mechanical advantage of a single movable block?
A few thousandths of an inch.
2. Each half of the rope carries an equal amount of weight.
A screw and a spur gear.
Direction - speed or size of the force applied.

47. Work is measured in units also known as?
Foot- pounds
2(pie)/pitch
The force used to overcome friction is greater than the force used to do useful work.
Third class lever.

48. What does a micrometer measure?
your arm.
Count the number of parts of the rope going to and from the movable block.
To raise a house or other heavy machinery.
A few thousandths of an inch.

49. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
To magnify the applied force.
Connects shafts having a 90 degree angle.
Wheel and axle.

50. The threads of a screw are cut so?
Wheel and axle.
A modification of an inclined plane.
The force used to overcome friction is greater than the force used to do useful work.
Less than 1.