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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 work formula?
Can change the direction of motion.
Work=Force*Distance
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
45

2. An egg beater has a mechanical advantage of what?
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.
Less than 1.
Work=Force*Distance

3. Formula for fractional mechanical disadvantage.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
The change of the direction of the pull.
2. Each half of the rope carries an equal amount of weight.

4. Class two lever
Shafts lying at any given angle.
Work=Force*Distance
The rope that passes through your hands is greater than the distance that the load is raised.
fulcrum- weight- effort

5. Friction is involved when?
Mechanical disadvantage. Use more force than the force of the load you lift.
Door knob.
Two surfaces move against one another.
Positive mechanical advantage.

6. With a single fixed sheave what is the only mechanical advantage?
To speed up the motion of resistence.
Third class lever.
Door knob.
The change of the direction of the pull.

7. The bevel gear is used to connect what?
Shafts lying at any given angle.
To speed up the motion of resistence.
2. Each half of the rope carries an equal amount of weight.
45

8. Work is measured in units also known as?
2(pie)/pitch
Length of ramp/length of height from floor to truck
Foot- pounds
When a resistance is overcome by a force acting through a measurable distance.

9. What is another way to find the mechanical advantage of an inclined plane?
Two surfaces move against one another.
When a resistance is overcome by a force acting through a measurable distance.
Foot- pounds
Length of ramp/length of height from floor to truck

10. What is the mechanical advantage of a single movable block?
To speed up the motion of resistence.
Can change the direction of motion.
To magnify the applied force.
2. Each half of the rope carries an equal amount of weight.

11. The threads of a screw are cut so?
Simple machine
Length of ramp/length of height from floor to truck
To magnify the applied force.
The force used to overcome friction is greater than the force used to do useful work.

12. What is the jack screw used for?
Magnify or reduce the force which you apply.
32/8 = 4
To raise a house or other heavy machinery.
To magnify the applied force.

13. How is distance measured in work?
To magnify the applied force.
Feet.
When a resistance is overcome by a force acting through a measurable distance.
Positive mechanical advantage.

14. What is the theoretical mechanical advantage of any gear train?
Positive 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.
Shafts lying at any given angle.
45

15. What direction does the effort and resistance move in the second class levers?
Direction - speed or size of the force applied.
Opposite.
Simple machine
Same.

16. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Opposite.
Direction - speed or size of the force applied.
A modification of an inclined plane.

17. What is the power formula?
Power=Work/Time
45
To speed up the motion of resistence.
Less than 1.

18. What kind of machine is the inclined plane?
Simple machine
In pounds.
Gravity - Magnetism - Friction - Recoil
Length of ramp/length of height from floor to truck

19. How is force measured in work?
Same.
Magnify or reduce the force which you apply.
In pounds.
2(pie)/pitch

20. What direction does the effort and resistance move in first class levers?
fulcrum- weight- effort
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
When a resistance is overcome by a force acting through a measurable distance.
Opposite.

21. What are first and third class levers used for?
Equals the weight of the object being hoisted.
32/8 = 4
Can change the direction of motion.
To magnify the applied force.

22. Fractional mechanical advantage
Length of ramp/length of height from floor to truck
Mechanical disadvantage. Use more force than the force of the load you lift.
32/8 = 4
Positive mechanical advantage.

23. What does a micrometer measure?
A few thousandths of an inch.
Door knob.
The change of the direction of the pull.
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.

24. What is the formula for the wheel and axle?
45
Opposite.
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
Connects shafts having a 90 degree angle.

25. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Power=Work/Time
The rope that passes through your hands is greater than the distance that the load is raised.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
1

26. What direction does the effort and resistance move in third class levers.
Foot- pounds
Wheel and axle.
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.

27. 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?
32/8 = 4
The rope that passes through your hands is greater than the distance that the load is raised.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

28. The worm gear is a combination of what?
2(pie)/pitch
Connects shafts having a 90 degree angle.
A screw and a spur gear.
Direction - speed or size of the force applied.

29. What is the second thing a gear can do?
Third class lever.
Feet.
Increase or decrease the the speed of the applied motion.
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 one type of second class lever?
The force used to overcome friction is greater than the force used to do useful work.
your arm.
Wheel and axle.
Feet.

31. What are the 4 forces?
2. Each half of the rope carries an equal amount of weight.
Gravity - Magnetism - Friction - Recoil
Connects shafts having a 90 degree angle.
Can change the direction of motion.

32. What is the ratio of any gear train?
To raise a house or other heavy machinery.
Connects shafts having a 90 degree angle.
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.

33. How can you figure out the mechanical advantage of most block and falls by glance?
In Horsepower.
Count the number of parts of the rope going to and from the movable block.
Feet.
1

34. How is work done?
Gravity - Magnetism - Friction - Recoil
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.
Length of ramp/length of height from floor to truck
When a resistance is overcome by a force acting through a measurable distance.

35. What is the third thing a gear can do?
Feet.
Can change the direction of motion.
The rope that passes through your hands is greater than the distance that the load is raised.
Magnify or reduce the force which you apply.

36. 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.
Opposite.
45
32/8 = 4

37. Gears can do a job for you by changing what three things?
The force used to overcome friction is greater than the force used to do useful work.
2. Each half of the rope carries an equal amount of weight.
Equals the weight of the object being hoisted.
Direction - speed or size of the force applied.

38. hat is a screw?
To raise a house or other heavy machinery.
A modification of an inclined plane.
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.
To speed up the motion of resistence.

39. What is the purpose of a third class lever?
Power=Work/Time
The change of the direction of the pull.
Opposite.
To speed up the motion of resistence.

40. The miter gear faces are beveled at what angle?
Increase or decrease the the speed of the applied motion.
A screw and a spur gear.
45
Count the number of parts of the rope going to and from the movable block.

41. What is the mechanical advantage for a single fixed block?
1
Mechanical disadvantage. Use more force than the force of the load you lift.
Work=Force*Distance
Connects shafts having a 90 degree angle.

42. What is the first thing a gear can do?
With oil - grease or soap.
Simple machine
Can change the direction of motion.
To speed up the motion of resistence.

43. What is another example of a wheel and axle?
In pounds.
Feet.
Equals the weight of the object being hoisted.
Door knob.

44. A miter gear connects what?
Feet.
The force used to overcome friction is greater than the force used to do useful work.
Direction - speed or size of the force applied.
Connects shafts having a 90 degree angle.

45. How do you find the mechanical advantage?
Foot- pounds
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.
Connects shafts having a 90 degree angle.

46. What is the formula for the mechanical advantage of a screw?
fulcrum- weight- effort
2(pie)/pitch
Less than 1.
Simple machine

47. What kind of mechanical advantage does the first and second class lever provide?
Same.
Work=Force*Distance
To magnify the applied force.
Positive mechanical advantage.

48. How do you measure power?
In Horsepower.
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.
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.

49. What type of lever provides a fractional mechanical advantage?
Third class lever.
Simple machine
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.

50. What is an example of a third class lever?
When a resistance is overcome by a force acting through a measurable distance.
Same.
your arm.
Two surfaces move against one another.