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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. hat is a screw?
A modification of an inclined plane.
Door knob.
Feet.
To magnify the applied force.

2. 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?
Equals the weight of the object being hoisted.
Positive mechanical advantage.
The rope that passes through your hands is greater than the distance that the load is raised.
32/8 = 4

3. How do you measure power?
A few thousandths of an inch.
The change of the direction of the pull.
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
In Horsepower.

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

5. Formula for fractional mechanical disadvantage.
Door knob.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Gravity - Magnetism - Friction - Recoil
1

6. 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.
The rope that passes through your hands is greater than the distance that the load is raised.
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.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

7. What is the power formula?
Gravity - Magnetism - Friction - Recoil
Power=Work/Time
Simple machine
Two surfaces move against one another.

8. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Work=Force*Distance
In Horsepower.

9. What kind of machine is the inclined plane?
A few thousandths of an inch.
Simple machine
Third class lever.
Can change the direction of motion.

10. What kind of mechanical advantage does the first and second class lever provide?
Increase or decrease the the speed of the applied motion.
Positive mechanical advantage.
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.

11. What is another example of a 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.
To magnify the applied force.
Door knob.
2. Each half of the rope carries an equal amount of weight.

12. How is work done?
1
When a resistance is overcome by a force acting through a measurable distance.
Work=Force*Distance
your arm.

13. The worm gear is a combination of what?
The change of the direction of the pull.
Simple machine
A screw and a spur gear.
Gravity - Magnetism - Friction - Recoil

14. What is the jack screw used for?
To raise a house or other heavy machinery.
Power=Work/Time
Wheel and axle.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

15. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
Power=Work/Time
Direction - speed or size of the force applied.
To magnify the applied force.

16. What does a micrometer measure?
A few thousandths of an inch.
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.
45

17. 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
Connects shafts having a 90 degree angle.
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.

18. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
Positive mechanical advantage.
The rope that passes through your hands is greater than the distance that the load is raised.
Equals the weight of the object being hoisted.

19. Class two lever
fulcrum- weight- effort
Magnify or reduce the force which you apply.
Mechanical disadvantage. Use more force than the force of the load you lift.
A screw and a spur gear.

20. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
Wheel and axle.
fulcrum- weight- effort
When a resistance is overcome by a force acting through a measurable distance.

21. What is the mechanical advantage for a single fixed block?
32/8 = 4
Same.
1
Equals the weight of the object being hoisted.

22. What type of lever provides a fractional 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.
Length of ramp/length of height from floor to truck
2. Each half of the rope carries an equal amount of weight.
Third class lever.

23. What is an example of a third class lever?
Direction - speed or size of the force applied.
fulcrum- weight- effort
your arm.
The change of the direction of the pull.

24. A miter gear connects what?
Connects shafts having a 90 degree angle.
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
Power=Work/Time

25. Gears can do a job for you by changing what three things?
Same.
When a resistance is overcome by a force acting through a measurable distance.
A screw and a spur gear.
Direction - speed or size of the force applied.

26. What is the third thing a gear can do?
To magnify the applied force.
Magnify or reduce the force which you apply.
Equals the weight of the object being hoisted.
A few thousandths of an inch.

27. 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.
Opposite.
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.

28. An egg beater has a mechanical advantage of what?
Power=Work/Time
Less than 1.
The rope that passes through your hands is greater than the distance that the load is raised.
2(pie)/pitch

29. What direction does the effort and resistance move in first class levers?
Gravity - Magnetism - Friction - Recoil
Door knob.
Opposite.
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. Fractional mechanical advantage
To magnify the applied force.
Mechanical disadvantage. Use more force than the force of the load you lift.
45
Feet.

31. Work is measured in units also known as?
Foot- pounds
The change of the direction of the pull.
45
A modification of an inclined plane.

32. Friction is involved when?
Count the number of parts of the rope going to and from the movable block.
32/8 = 4
Two surfaces move against one another.
Gravity - Magnetism - Friction - Recoil

33. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Connects shafts having a 90 degree angle.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Equals the weight of the object being hoisted.
When a resistance is overcome by a force acting through a measurable distance.

34. How do you find the mechanical advantage?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Work=Force*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.
Same.

35. What are first and third class levers used for?
To magnify the applied force.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
In pounds.
Length of ramp/length of height from floor to truck

36. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Gravity - Magnetism - Friction - Recoil
Two surfaces move against one another.
Increase or decrease the the speed of the applied motion.

37. How is force measured in work?
In pounds.
Third class lever.
Work=Force*Distance
Direction - speed or size of the force applied.

38. With a single fixed sheave what is the only mechanical advantage?
In Horsepower.
2. Each half of the rope carries an equal amount of weight.
The change of the direction of the pull.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

39. What direction does the effort and resistance move in the second class levers?
2(pie)/pitch
A few thousandths of an inch.
Same.
Connects shafts having a 90 degree angle.

40. How is distance measured in work?
Equals the weight of the object being hoisted.
Opposite.
Feet.
When a resistance is overcome by a force acting through a measurable distance.

41. What direction does the effort and resistance move in third class levers.
1
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.
Opposite.

42. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
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.
A modification of an inclined plane.

43. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Magnify or reduce the force which you apply.
In pounds.
The rope that passes through your hands is greater than the distance that the load is raised.
Length of ramp/length of height from floor to truck

44. What is the ratio of any gear train?
Can change the direction of 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.
When a resistance is overcome by a force acting through a measurable distance.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

45. What is the lever formula?
Gravity - Magnetism - Friction - Recoil
your arm.
Wheel and axle.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

46. What is the purpose of a third class lever?
Simple machine
In pounds.
To speed up the motion of resistence.
Gravity - Magnetism - Friction - Recoil

47. What is one type of second class lever?
Wheel and axle.
When a resistance is overcome by a force acting through a measurable distance.
Work=Force*Distance
Same.

48. The bevel gear is used to connect what?
Shafts lying at any given angle.
In Horsepower.
Power=Work/Time
The change of the direction of the pull.

49. What is the first thing a gear can do?
Can change the direction of motion.
A screw and a spur gear.
Same.
Simple machine

50. What is the work formula?
1
Third class lever.
With oil - grease or soap.
Work=Force*Distance