Physical Science Ch 5 H Flashcards
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| 16302046465 | Approximately how much work do you do when you lift your 10 kg sister to a height of 1.5m? | 15 J |  | 0 |
| 16302497456 | What would happen to the mechanical advantage if the radius of the door knob were doubled? | it would be multiplied by 2 |  | 1 |
| 16303623831 | pulley | what is this simple machine? |  | 2 |
| 16303652651 | less than 100% | the efficiency of this pulley system is | | 3 |
| 16302588450 | The class of this lever is an example would be |  | 4 | |
| 16304529438 | The boy in the photograph is carrying a box to the top of the stairs. Describe how the work that the boy does on the box is related to the energy transfer that occurs. How does the energy of the box change form as the boy carries the box up the stairs? |  | 5 | |
| 16302046466 | A 10kg box sits on the floor. Approximately how high would you have to lift the box to increase gravitational potential energy by 350J? | 3.5m, 7m, 15m, or 40m? Note: GPE= mgh, height =GPE/(mass x gravity)=350/(10*9.8) | 6 | |
| 16302046467 | When a machine does work on an object the output work is which of the following? | less than input work, equal to input work or greater than input work? | 7 | |
| 16302046468 | If the input force on a lever is 200 N, then the output force from that lever is 50 N. What is the MA of the lever? | 1.0, 0.25, 4, 6 | 8 | |
| 16302046469 | In a pulley system, the efficiency is ... | exactly 100%, exactly 400%, greater than 100% less than 100% Note: The efficiency of a real machine is always less than 100% | 9 | |
| 16302046470 | An input force of 80 N is used to lift an object weighing 240N with a system of pulleys. What is the mechanical advantage of the pulley system? | 2, 3, 4, 5 Note: MA=output force/input force =240 N/ 80 N=3 | 10 | |
| 16302046471 | What is the combination of two or more simple machines called? | compound machine | 11 | |
| 16302046472 | What are the six types of simple machines? | lever, pulley, axel and wheel, screw, lever and wedge | 12 | |
| 16302046473 | What are the two conditions necessary for work to be done on an object? | there must be a force applied over a specified distance | 13 | |
| 16302046474 | Define mechanical advantage | ratio of output force over the input force | 14 | |
| 16302046475 | What kinds of potential energy are there? | elastic potential energy, gravitational potential energy and chemical potential energy (stored energy in chemical bonds like food), mechanical potential energy etc... | 15 | |
| 16302046476 | Which of the following factors change the gravitational potential energy of an object? | length of object, temperature of object or the mass of the object? Why? What is the equation for GPE? | 16 | |
| 16302046477 | What is the difference between direct and alternating current? | See lab on generators | 17 | |
| 16302046478 | What is a transformer? What are they useful for? | See lab on generators | 18 | |
| 16302046479 | Where was GPE the highest for the marble in your Rube Goldberg machine? | See lab on Rube Goldberg Machines | 19 | |
| 16302046480 | Where was kinetic energy and GPE equal in your Rube Goldberg machine? | See lab on Rube Goldberg Machines | 20 | |
| 16302046481 | What is the equation for kinetic energy? | KE=1/2 mv2 | 21 | |
| 16302046482 | A jogger with a mass of 75 kg is moving forward at a speed of 2m/s. What is the jogger's kinetic energy from this forward motion? | calculate it! | 22 | |
| 16302046483 | What is the GPE of an Earth-dictionary system if the dictionary has a mass of 2 kg and is located 3 m above the ground? | Find the equation and calculate it! | 23 | |
| 16302046484 | Solve the GPE equation for height | GPE=mgh divide both sides by mg GPE/mg=h | 24 | |
| 16302046485 | http://www.rubegoldberg.com/gallery# visit the site above and find the cartoon of the penguin in A SIMPLE PARACHUTE (under play and sports on the left) on the rube goldberg site A. What type of energy is being used at step F? B. What type of energy is being used at step G? (there are 2) | ... | 25 | |
| 16302046486 | Which has more kinetic energy? A 25kg rolling ball or a 30kg rolling ball? | 30 Kg | 26 | |
| 16302046487 | Which has more potential energy? A plane on the ground or in the air? | in the air | 27 | |
| 16302046488 | energy stored in chemical bonds | chemical energy | 28 | |
| 16302046489 | heat energy | thermal energy | 29 | |
| 16302046490 | energy from radiation | nuclear energy | 30 | |
| 16302046491 | energy from an object's motion | mechanical energy | 31 | |
| 16302046492 | energy from moving electrons | electrical energy | 32 | |
| 16302046493 | energy from light | radiant energy | 33 | |
| 16302046494 | T/F: Input work is always less than the output work | True | 34 | |
| 16302046495 | T/F: Machines can be 100% efficient | False, they are always less than 100% due to friction | 35 | |
| 16302046496 | Define the Law of Conservation in your own words | Energy just TRANSFORMS from one form to another. It is never created and can't be destroyed. | 36 | |
| 16302046497 | The units for efficiency | % | 37 | |
| 16302046498 | The units for energy | J-joules | 38 | |
| 16302046499 | The units for mechanical advantage | none | 39 | |
| 16302046500 | For a flashlight to be turned on by a biological living thing, what are the energy transformations that must occur? Place them in the proper order. | chemical, mechanical, electrical, radiant, thermal | 40 | |
| 16302046501 | When a ball is thrown into the air, what kind of energy does it have at the VERY VERY top before it begins to fall? | GPE | 41 | |
| 16302046502 | What type of energy does the thrown ball have half way down toward its decent toward the ground? | half GPE and half kinetic energy | 42 | |
| 16302046503 | When a ball is thrown into the air, what kind of energy does it have at the VERY VERY bottom before it reaches the ground? | all the GPE has been converted back to kinetic energy | 43 | |
| 16302046504 | A 4 kg ball is on a 5m ledge. If it is pushed off the ledge, how much kinetic energy will it have just before hitting the ground? | calcualte it KE=1/2 mv2 | 44 | |
| 16302046505 | where are the regions where a magnet is strongest? | the poles | 45 | |
| 16302046506 | T/F Electromagnets are permanent magnets | false, they are temporary | 46 | |
| 16302046507 | T/F Generators turn electrical energy into mechanical energy | false, they turn mechanical energy into electrical | 47 | |
| 16302046509 | The ratio of the output force to the input force is the __________________________ of a machine. | mechanical advantage | 48 | |
| 16302046510 | The energy due to compressing a spring is ____________________. | Elastic potential energy | 49 | |
| 16302046511 | 5. When an athlete runs, he/she transforms chemical energy of food molecules into _______________ energy. | mechanical energy | 50 | |
| 16302046512 | Friction causes mechanical energy to be converted into which form? | thermal energy | 51 | |
| 16302046513 | How much work do you do when you lift an 80N child 0.5m? | 40 J | 52 | |
| 16302046514 | An input force of 50 N is used to lift an object weighing 300 N with a system of pulleys. What is the mechanical advantage of the pulley system? | 6 | 53 | |
| 16302046515 | A jogger with a mass of 60kg is moving forward at a speed of 3m/s. What is the jogger's kinetic energy from this forward motion? | 270 J | 54 | |
| 16302046516 | What is the GPE of an Earth-dictionary system if the dictionary has a mass of 5 kg and is located 2m above the ground? Us the ground as the reference level. | 100 J | 55 | |
| 16302046517 | Which of the following changes electrical energy into mechanical energy? | electromagnets take energy from the battery and pick up things, such as paperclips, which is mechanical energy | 56 | |
| 16302046518 | How is the law of conservation of energy related to a generator in a home when the lights go out? | The engine in the generator takes the chemical energy supplied by the gasoline and turns it into mechanical energy when it turns the motor. The motor in turn changes the energy into electrical energy from the flow of electrons. The electrical energy can then be turned into radiant energy of light or thermal energy of heat for the home. | 57 |