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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. 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?
A modification of an inclined plane.
Mechanical disadvantage. Use more force than the force of the load you lift.
fulcrum- weight- effort
32/8 = 4

2. How is distance measured in work?
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.
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.

3. Work is measured in units also known as?
Foot- 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.
Third class lever.
Work=Force*Distance

4. How can you decrease friction on flat surfaces?
Direction - speed or size of the force applied.
With oil - grease or soap.
Foot- pounds
Simple machine

5. What is one type of second class lever?
Same.
Wheel and axle.
Opposite.
Foot- pounds

6. The threads of a screw are cut so?
Direction - speed or size of the force applied.
Wheel and axle.
Can change the direction of motion.
The force used to overcome friction is greater than the force used to do useful work.

7. What direction does the effort and resistance move in first class levers?
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.
your arm.
Opposite.
Length of ramp/length of height from floor to truck

8. What are the 4 forces?
With oil - grease or soap.
Gravity - Magnetism - Friction - Recoil
Shafts lying at any given angle.
Work=Force*Distance

9. Formula for fractional mechanical disadvantage.
To speed up the motion of resistence.
A few thousandths of an inch.
Third class lever.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

10. With a single fixed sheave what is the only mechanical advantage?
32/8 = 4
With oil - grease or soap.
Opposite.
The change of the direction of the pull.

11. What direction does the effort and resistance move in the second class levers?
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.
A few thousandths of an inch.
Opposite.

12. What is the work formula?
Foot- pounds
A few thousandths of an inch.
Opposite.
Work=Force*Distance

13. What are first and third class levers used for?
A screw and a spur gear.
Shafts lying at any given angle.
Wheel and axle.
To magnify the applied force.

14. 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.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
1
Power=Work/Time

15. The worm gear is a combination of what?
Direction - speed or size of the force applied.
A screw and a spur gear.
Foot- pounds
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

16. 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.
Wheel and axle.
Mechanical disadvantage. Use more force than the force of the load you lift.
A few thousandths of an inch.

17. What kind of machine is the inclined plane?
Simple machine
Positive 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
Work=Force*Distance

18. What is the ratio of any gear train?
Shafts lying at any given angle.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Count the number of parts of the rope going to and from the movable block.
2. Each half of the rope carries an equal amount of weight.

19. Class two 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.
fulcrum- weight- effort
Count the number of parts of the rope going to and from the movable block.

20. What is the power formula?
Direction - speed or size of the force applied.
Power=Work/Time
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.

21. Fractional mechanical advantage
your arm.
Mechanical disadvantage. Use more force than the force of the load you lift.
Same.
fulcrum- weight- effort

22. How is force measured in work?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Wheel and axle.
Simple machine
In pounds.

23. What does a micrometer measure?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Can change the direction of motion.
45
A few thousandths of an inch.

24. 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.
When a resistance is overcome by a force acting through a measurable distance.
With oil - grease or soap.
Power=Work/Time

25. 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
The change of the direction of the pull.
A few thousandths of an inch.
1

26. What is an example of a third class lever?
The rope that passes through your hands is greater than the distance that the load is raised.
your arm.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by 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.

27. An egg beater has a mechanical advantage of what?
Count the number of parts of the rope going to and from the movable block.
your arm.
Less than 1.
Length of ramp/length of height from floor to truck

28. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
Connects shafts having a 90 degree 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
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

29. hat is a screw?
A modification of an inclined plane.
Positive mechanical advantage.
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.

30. What is the second thing a gear can do?
In pounds.
A modification of an inclined plane.
The force used to overcome friction is greater than the force used to do useful work.
Increase or decrease the the speed of the applied motion.

31. 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.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Increase or decrease the the speed of the applied motion.
Door knob.

32. How can you figure out the mechanical advantage of most block and falls by glance?
your arm.
Count the number of parts of the rope going to and from the movable block.
Length of ramp/length of height from floor to truck
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

33. The bevel gear is used to connect what?
Shafts lying at any given 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
2. Each half of the rope carries an equal amount of weight.
Two surfaces move against one another.

34. How is work done?
A few thousandths of an inch.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
When a resistance is overcome by a force acting through a measurable distance.
Door knob.

35. What is the mechanical advantage of a single movable block?
In Horsepower.
Equals the weight of the object being hoisted.
2. Each half of the rope carries an equal amount of weight.
Simple machine

36. Friction is involved when?
Increase or decrease the the speed of the applied motion.
Two surfaces move against one another.
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.

37. What kind of mechanical advantage does the first and second class lever provide?
Count the number of parts of the rope going to and from the movable block.
Positive mechanical advantage.
To raise a house or other heavy machinery.
To speed up the motion of resistence.

38. What is the jack screw used for?
In Horsepower.
When a resistance is overcome by a force acting through a measurable distance.
The rope that passes through your hands is greater than the distance that the load is raised.
To raise a house or other heavy machinery.

39. What is the lever formula?
The rope that passes through your hands is greater than the distance that the load is raised.
Two surfaces move against one another.
32/8 = 4
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

40. What is another way to find the mechanical advantage of an inclined plane?
Gravity - Magnetism - Friction - Recoil
2(pie)/pitch
Length of ramp/length of height from floor to truck
Wheel and axle.

41. What direction does the effort and resistance move in third class levers.
Same.
Two surfaces move against one another.
The force used to overcome friction is greater than the force used to do useful work.
fulcrum- weight- effort

42. A miter gear connects what?
Connects shafts having a 90 degree angle.
Two surfaces move against one another.
Length of ramp/length of height from floor to truck
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

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

44. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
Simple machine
Foot- pounds
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

45. What is the mechanical advantage for a single fixed block?
Same.
1
A screw and a spur gear.
Third class lever.

46. What is the purpose of a third class lever?
Simple machine
To speed up the motion of resistence.
Foot- pounds
The force used to overcome friction is greater than the force used to do useful work.

47. Gears can do a job for you by changing what three things?
2. Each half of the rope carries an equal amount of weight.
Direction - speed or size of the force applied.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
When a resistance is overcome by a force acting through a measurable distance.

48. How do you measure power?
Can change the direction of motion.
In Horsepower.
To speed up the motion of resistence.
Magnify or reduce the force which you apply.

49. What is another example of a wheel and axle?
Door knob.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Simple machine
The rope that passes through your hands is greater than the distance that the load is raised.

50. What type of lever provides a fractional mechanical advantage?
In pounds.
Wheel and axle.
Third class lever.
Foot- pounds