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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. How is distance measured in work?
Two surfaces move against one another.
Same.
Feet.
2. Each half of the rope carries an equal amount of weight.

2. The worm gear is a combination of what?
A screw and a spur gear.
Wheel and axle.
Power=Work/Time
A modification of an inclined plane.

3. What is the jack screw used for?
Same.
To raise a house or other heavy machinery.
Work=Force*Distance
fulcrum- weight- effort

4. What is the lever formula?
Work=Force*Distance
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.
In pounds.

5. The bevel gear is used to connect what?
2. Each half of the rope carries an equal amount of weight.
Same.
Shafts lying at any given angle.
To raise a house or other heavy machinery.

6. What is another example of a wheel and axle?
Door knob.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
2. Each half of the rope carries an equal amount of weight.
A few thousandths of an inch.

7. What are first and third class levers used for?
To magnify the applied force.
When a resistance is overcome by a force acting through a measurable distance.
Direction - speed or size of the force applied.
1

8. What is the first thing a gear can do?
Connects shafts having a 90 degree angle.
Foot- pounds
Can change the direction of motion.
The change of the direction of the pull.

9. How do you measure power?
32/8 = 4
In Horsepower.
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.

10. How can you decrease friction on flat surfaces?
With oil - grease or soap.
A few thousandths of an inch.
Door knob.
Simple machine

11. How can you figure out the mechanical advantage of most block and falls by glance?
Count the number of parts of the rope going to and from the movable block.
45
Length of ramp/length of height from floor to truck
Work=Force*Distance

12. How do you find the mechanical advantage?
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.
A modification of an inclined plane.
Feet.

13. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Opposite.
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.

14. hat is a screw?
Connects shafts having a 90 degree angle.
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 each of the driver gears/ divided by the product of number of teeth of the driven gear.

15. What direction does the effort and resistance move in first class levers?
Opposite.
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.
your arm.

16. An egg beater has a mechanical advantage of what?
45
Less than 1.
In Horsepower.
The force used to overcome friction is greater than the force used to do useful work.

17. What direction does the effort and resistance move in the second class levers?
Magnify or reduce the force which you apply.
Same.
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.

18. Fractional mechanical advantage
Two surfaces move against one another.
Direction - speed or size of the force applied.
Mechanical disadvantage. Use more force than the force of the load you lift.
A modification of an inclined plane.

19. What is the mechanical advantage for a single fixed block?
1
Count the number of parts of the rope going to and from the movable block.
Equals the weight of the object being hoisted.
your arm.

20. What is the second thing a gear can do?
Wheel and axle.
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.
Increase or decrease the the speed of the applied motion.

21. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Shafts lying at any given angle.
Equals the weight of the object being hoisted.
Wheel and axle.
Can change the direction of motion.

22. Class two lever
Magnify or reduce the force which you apply.
Direction - speed or size of the force applied.
fulcrum- weight- effort
Power=Work/Time

23. 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?
Gravity - Magnetism - Friction - Recoil
32/8 = 4
Wheel and axle.
Third class lever.

24. What is one type of second class lever?
Foot- pounds
Mechanical disadvantage. Use more force than the force of the load you lift.
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.

25. 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.
A screw and a spur 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.
Simple machine

26. What kind of mechanical advantage does the first and second class lever provide?
In Horsepower.
Positive mechanical advantage.
To magnify the applied force.
45

27. What direction does the effort and resistance move in third class levers.
Power=Work/Time
Direction - speed or size of the force applied.
Same.
your arm.

28. What is the formula for the mechanical advantage of a screw?
To magnify the applied force.
Magnify or reduce the force which you apply.
Connects shafts having a 90 degree angle.
2(pie)/pitch

29. What is the power formula?
Power=Work/Time
Wheel and axle.
Count the number of parts of the rope going to and from the movable block.
In Horsepower.

30. What is another way to find the mechanical advantage of an inclined plane?
Direction - speed or size of the force applied.
Positive mechanical advantage.
Length of ramp/length of height from floor to truck
Two surfaces move against one another.

31. What is an example of a third class lever?
Mechanical disadvantage. Use more force than the force of the load you lift.
Same.
your arm.
2(pie)/pitch

32. How is work done?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
When a resistance is overcome by a force acting through a measurable distance.
Shafts lying at any given angle.
Magnify or reduce the force which you apply.

33. Gears can do a job for you by changing what three things?
Power=Work/Time
A modification of an inclined plane.
Direction - speed or size of the force applied.
Magnify or reduce the force which you apply.

34. What is the work formula?
Work=Force*Distance
Gravity - Magnetism - Friction - Recoil
Door knob.
The force used to overcome friction is greater than the force used to do useful work.

35. With a single fixed sheave what is the only mechanical advantage?
A modification of an inclined plane.
Power=Work/Time
The change of the direction of the pull.
To magnify the applied force.

36. Work is measured in units also known as?
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
The change of the direction of the pull.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

37. What are the 4 forces?
The force used to overcome friction is greater than the force used to do useful work.
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.
Gravity - Magnetism - Friction - Recoil

38. How is force measured in work?
Two surfaces move against one another.
The force used to overcome friction is greater than the force used to do useful work.
Equals the weight of the object being hoisted.
In pounds.

39. What does a micrometer measure?
2(pie)/pitch
Magnify or reduce the force which you apply.
A few thousandths of an inch.
45

40. What is the purpose of a third class lever?
Increase or decrease the the speed of the applied motion.
Equals the weight of the object being hoisted.
The force used to overcome friction is greater than the force used to do useful work.
To speed up the motion of resistence.

41. Friction is involved when?
Less than 1.
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.
Third class lever.

42. The threads of a screw are cut so?
A screw and a spur gear.
The force used to overcome friction is greater than the force used to do useful work.
A modification of an inclined plane.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

43. What type of lever provides a fractional mechanical advantage?
Count the number of parts of the rope going to and from the movable block.
Opposite.
In pounds.
Third class lever.

44. What is the third thing a gear can do?
Foot- pounds
Magnify or reduce the force which you apply.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
To speed up the motion of resistence.

45. A miter gear connects what?
Wheel and axle.
Door knob.
Count the number of parts of the rope going to and from the movable block.
Connects shafts having a 90 degree angle.

46. What is the mechanical advantage of a single movable block?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
To raise a house or other heavy machinery.
32/8 = 4
2. Each half of the rope carries an equal amount of weight.

47. What is the ratio of any gear train?
In pounds.
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.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

48. The miter gear faces are beveled at what angle?
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.
Wheel and axle.
45

49. Formula for fractional mechanical disadvantage.
Equals the weight of the object being hoisted.
Third class lever.
A few thousandths of an inch.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

50. What is the formula for the wheel and axle?
Door knob.
A few thousandths of an inch.
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.