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Mechanical Systems 3

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
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. How can you decrease friction on flat surfaces?
With oil - grease or soap.
The rope that passes through your hands is greater than the distance that the load is raised.
In pounds.
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 are first and third class levers used for?
To magnify the applied force.
Third class lever.
Foot- pounds
Opposite.

3. What is the mechanical advantage of a single movable block?
In Horsepower.
Length of ramp/length of height from floor to truck
2. Each half of the rope carries an equal amount of weight.
Wheel and axle.

4. Fractional mechanical advantage
Shafts lying at any given angle.
Mechanical disadvantage. Use more force than the force of the load you lift.
Can change the direction of motion.
Less than 1.

5. What kind of mechanical advantage does the first and second class lever provide?
45
With oil - grease or soap.
To raise a house or other heavy machinery.
Positive mechanical advantage.

6. 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?
Simple machine
Third class lever.
Wheel and axle.
32/8 = 4

7. Formula for fractional mechanical disadvantage.
2. Each half of the rope carries an equal amount of weight.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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.

8. What type of lever provides a fractional mechanical advantage?
Power=Work/Time
Third class lever.
In Horsepower.
Simple machine

9. What is the formula for the wheel and axle?
A modification of an inclined plane.
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
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

10. What direction does the effort and resistance move in third class levers.
Third class lever.
Positive mechanical advantage.
Same.
Two surfaces move against one another.

11. What direction does the effort and resistance move in first class levers?
A few thousandths of an inch.
Count the number of parts of the rope going to and from the movable block.
With oil - grease or soap.
Opposite.

12. What is the purpose of a third class lever?
Increase or decrease the the speed of the applied motion.
Same.
To speed up the motion of resistence.
A few thousandths of an inch.

13. A miter gear connects what?
Connects shafts having a 90 degree angle.
To speed up the motion of resistence.
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.

14. What is the formula for the mechanical advantage of a screw?
Power=Work/Time
2(pie)/pitch
To speed up the motion of resistence.
Positive mechanical advantage.

15. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
fulcrum- weight- effort
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.

16. What is the second thing a gear can do?
Foot- pounds
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.
Third class lever.

17. Friction is involved when?
Two surfaces move against one another.
Same.
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
Mechanical disadvantage. Use more force than the force of the load you lift.

18. The worm gear is a combination of what?
Simple machine
fulcrum- weight- effort
A screw and a spur gear.
Less than 1.

19. 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.
Third class lever.
Direction - speed or size of the force applied.

20. The miter gear faces are beveled at what angle?
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.
45
With oil - grease or soap.

21. What is one type of second class lever?
Two surfaces move against one another.
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.
Third class lever.

22. What is another way to find the mechanical advantage of an inclined plane?
2(pie)/pitch
32/8 = 4
fulcrum- weight- effort
Length of ramp/length of height from floor to truck

23. What is another example of a wheel and axle?
Shafts lying at any given angle.
Door knob.
Equals the weight of the object being hoisted.
To magnify the applied force.

24. 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/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
32/8 = 4
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

25. Work is measured in units also known as?
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.
Foot- pounds
fulcrum- weight- effort
To speed up the motion of resistence.

26. How do you measure power?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
In Horsepower.
Gravity - Magnetism - Friction - Recoil
Third class lever.

27. What are the 4 forces?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Door knob.
Gravity - Magnetism - Friction - Recoil
Wheel and axle.

28. What is the mechanical advantage for a single fixed block?
A modification of an inclined plane.
Foot- pounds
your arm.
1

29. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
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.
A screw and a spur gear.
Count the number of parts of the rope going to and from the movable block.
The rope that passes through your hands is greater than the distance that the load is raised.

30. The bevel gear is used to connect what?
Can change the direction of motion.
To speed up the motion of resistence.
The change of the direction of the pull.
Shafts lying at any given angle.

31. The threads of a screw are cut so?
Third class lever.
Positive mechanical advantage.
A few thousandths of an inch.
The force used to overcome friction is greater than the force used to do useful work.

32. 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.
Power=Work/Time
Shafts lying at any given angle.

33. What is the first thing a gear can do?
The change of the direction of the pull.
32/8 = 4
Can change the direction of motion.
Length of ramp/length of height from floor to truck

34. Class two lever
fulcrum- weight- effort
your arm.
Power=Work/Time
Gravity - Magnetism - Friction - Recoil

35. How can you figure out the mechanical advantage of most block and falls by glance?
When a resistance is overcome by a force acting through a measurable distance.
Positive mechanical advantage.
Same.
Count the number of parts of the rope going to and from the movable block.

36. Gears can do a job for you by changing what three things?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
A few thousandths of an inch.
Direction - speed or size of the force applied.
Foot- pounds

37. What is an example of a third class lever?
Foot- pounds
Gravity - Magnetism - Friction - Recoil
To magnify the applied force.
your arm.

38. What direction does the effort and resistance move in the second class levers?
Same.
Connects shafts having a 90 degree angle.
Foot- pounds
Can change the direction of motion.

39. How do you find the mechanical advantage?
Opposite.
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.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

40. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
Power=Work/Time
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.

41. What is the jack screw used for?
To raise a house or other heavy machinery.
When a resistance is overcome by a force acting through a measurable distance.
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.

42. What kind of machine is the inclined plane?
Positive mechanical advantage.
Connects shafts having a 90 degree angle.
Simple machine
Power=Work/Time

43. 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.
Foot- pounds
To speed up the motion of resistence.

44. How is distance measured in work?
Less than 1.
Feet.
your arm.
Positive mechanical advantage.

45. What is the work formula?
45
Magnify or reduce the force which you apply.
The force used to overcome friction is greater than the force used to do useful work.
Work=Force*Distance

46. What is the theoretical mechanical advantage of any gear train?
A modification of an inclined plane.
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.
With oil - grease or soap.

47. What is the power formula?
Connects shafts having a 90 degree angle.
Equals the weight of the object being hoisted.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Power=Work/Time

48. What is the lever formula?
fulcrum- weight- effort
Less than 1.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
To magnify the applied force.

49. How is force measured in work?
Gravity - Magnetism - Friction - Recoil
Feet.
Wheel and axle.
In pounds.

50. An egg beater has a mechanical advantage of what?
A modification of an inclined plane.
Less than 1.
2. Each half of the rope carries an equal amount of weight.
In pounds.