# science comp 2

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1. energy in the form of motion
kinetic energy
2. SI unit of energy
joule
3. stored energy due to postition, can be converted to kinetic energy when something acts to release it
potential energy
4. sum of potential and kinetic energy in a system
mechanical energy
5. transfer of energy that occurs when a force makes an object move
work
6. amount of work done, or the amount of energy transfered in a certain amount of time
power
7. device that makes doing work easier
machine
8. measure of how much of the work put into a machine is changed into work done by a machine
efficiency
9. force exerted on a machine that is used to do work
effort force
10. force applied by a machine to overcome resistance
resistance force
11. the fixed point on a lever
fulcrum
12. machine that does work with only one movement
simple machine
13. combination of two or more simple machines
compound machine
14. solar heating system device that absorbs radiant energy from the sun
solar collector
15. total energy, including kinetic and potential energy of the particles that make up a material
thermal energy
16. energy from the sun that is free, renewable, and can be used to heat buildings
solar energy
17. device that removes thermal energy from one place and transfers it to another place at a different temperature
heat mover
18. material that doesn't allow electrons to move through it easily
insulator
19. thermal energy that flows from a warmer material to a cooler material
heat
20. a measure of the average kinetic energy of all the particles in an object
temperature
21. formula for gravitational potential energy
GPE=m*9.8m/s2 * h
22. formula for kinetic energy
KE=1/2m * v2
23. formula for work
• W=f*d
• work = force * distance
24. formula for power
• P= w/t
• P= work/time
25. formula for the IMA of an inclined plane
• IMA= l/h
• length/ height
26. formula for the IMA of a wheel and axle
• IMA= Rw/Ra
27. Formula for the IMA of a lever
• IMA= Le/Lr
• length of effort arm/ length of resistance arm
28. formula for the change in thermal energy
• Q=m* (Tf-Ti) *C
• Q= m*(Tf-Ti) * specific heat
29. transfer of energy in the form of electomagnetic waves
30. device that converts thermal energy produced by combustion into mechanical energy
heat engine
31. amount of energy needed to raise the temperature of 1kg of a material to 1k
specific heat
32. a type of heat engine that burns fuel inside the engine
internal combustion engine
33. a unit to measure how much energy you get from food
calorie
34. 1c= how many joules?
4,184j
35. 1g of fat= how many calories?
• 9c
• 9c= 37,656j
36. 1g of carb = how many calories?
• 4c
• 4c= 16,736j
37. 4 stroke engine
• 1.intake
• 2.compression
• 3.power
• 4.exhaust
38. 3 types of potential energy
• 1.Gravitational
• 2.Elastic
• 3.Chemical
39. energy stored by objects above Earth's surface
gravitational potential energy
40. energy stored by something that can stretch or compress
elastic potential energy
41. energy in chemical bonds
chemical potential energy
42. 3 types of levers
• 1.first class
• 2.second class
• 3.third class
43. changes direction of applied force
first class lever
44. resistance force is between effort force and fulcrum
second class lever
45. effort force is located between resistance force and fulcrum
third class lever
46. energy is converted from a small amount of mass, atoms added together
nuclear fussion
47. converts mass into energy, atoms are broken apart
nuclear fission
48. types of machines
• 1.lever
• 2.pulley
• 3.wheel & axle
• 4.inclined plane
• 5.screw
• 6.wedge
• 7.compound machine
49. a bar that is free to pivot, or turn around a fixed point
lever
50. grooved wheel with a rope, chain, or cable running along it
pulley
51. two wheels of different sizes that rotate together
wheel & axle
52. a sloping surface, ramp
inclined plane
53. two or more simple machines are used together
compound machine
54. substance used to absorb heat
coolant
55. when is work done?
• 1.object has to move
• 2.moves in direction of applied force
56. human coolant
sweat, absorbs heat from body
57. why is water the best coolant?
Because it takes the longest to heat up and cool down
58. 3 heating systems
• 1.forced air
• 2.electric