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SCIENCE FINAL Flashcards

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Biology 101 flashcards
1
Q

displacment

A

direction and length of a straight line starting point to ending point

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2
Q

displacment vectors example

A

starts at home and ends at your school.a

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3
Q

acceleration-

A

change in speed or direction

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4
Q

object at rest has an instaneous speed of

A

zero

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5
Q

instaneous acceleration and example-

A

velocity changing in specific instant ex: speedometer

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6
Q

frame of reference

A

depending on the frame of reference the object will look different

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7
Q

what is the SI unit for length and distance

A

meter

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8
Q

accelerate equals?

A

velocity changes

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9
Q

what is an accelerated motion on a graph

A

a curved line

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10
Q

what is the difference between velocity and speed

A

distance and displacment

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11
Q

what happens when an unbalanced force acts on an object

A

the object accelerates

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12
Q

fluid friction and example-

A

liquid or gas ex. human or fish swimming

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13
Q

interia resists what?

A

change in motion

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14
Q

an object as rest remains ______

A

at rest

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15
Q

an object in motion remains in _________

A

motion

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16
Q

action reaction forces examples

A

rowing a boat, racket hitting a ball, stepping off a curb

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17
Q

what is the formula for momentum

A

mass x velocity

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18
Q

2 positively charged particles will

A

repel each other

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19
Q

2 unlike charged particles will

A

attract each other

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20
Q

weak nuclear force is ____

A

nuclear decay

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21
Q

gravity universal force is effective over

A

a long distance

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22
Q

EX. weight can be measured by

A

a grocery spring scale

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23
Q

what is the force of a sky diver

A

net force is going down, no force will be on the diver

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24
Q

what will happen when u double acceleration

A

it will double the net force on an object if u do not increase the mass

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25
Q

momentum is equal in ____ but in _____

A

size, opposite direction

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26
Q

what is the SI unit for Pressure

A

pascal

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27
Q

70N/m is = to?

A

70 pascal

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28
Q

what is the pascal principle

A

a change in a fluid in a closed container, trasmitted equally and uncharged in all direction

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29
Q

lift-

A

upward force acting on a wing of an airplane or bird in flight

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30
Q

what does strength of a bouyant force depend on

A

the objects volume

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31
Q

fluid-

A

a substance that flows and takes the shape of a container

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32
Q

as altitude _____ the air pressure ____

A

increases, decreases

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33
Q

bouyant force acts on ____

A

any object in liquid

34
Q

if an object sinks the weight is ___ then the bouyant force

A

greater

35
Q

what is the SI unit for work

A

joules

36
Q

The SI unit for power is

A

watts

37
Q

10 x 0.9 =

A

9.0 joules

38
Q

what is the formula for power

A

p = work / change in temapture

39
Q

machine-

A

a device that can multiply force

40
Q

reducing friction in a machine increases what?

A

effinciny

41
Q

what is an axe

A

a simple machine called a wedge

42
Q

what is an example of a wheel and axle

A

steering wheel or door knob

43
Q

what is a screw

A

an inclined place wrapped around a cylinder

44
Q

effort force

A

the force used to move an object over a distance

45
Q

fulcrum-

A

the pivot around which a lever turns

46
Q

resistance force-

A

the vector sum of numerous forces

47
Q

compound machine-

A

two or more simple machines working together

48
Q

watts and horsepower are both units of ????

A

power

49
Q

work is ____

A

the transfer of energy

50
Q

gravtitaional potential energy-

A

mass and acceleration due to speed

51
Q

what are examples of elastic potential energy

A

wind up toy, compressed basketball, stretched rubber band, pole vaulters pole

52
Q

mechanical energy is stored in what

A

gasoline and in food

53
Q

what does walking/ running convert into

A

chemical energy –> mechanical energy

54
Q

what does eisteins equation deal with

A

nuclear fission and fusion

55
Q

biomass energy-

A

chemical energy stored into living things

56
Q

energy increases when ____

A

work Is done

57
Q

if the mass doubles the kinetic energy ____

A

doubles

58
Q

what are the types of energy

A

kinetic, potential, and energy in the feilds

59
Q

what do wind turbines convert to

A

kinetic energy –> electrical energy

60
Q

energy conversion-

A

energy changing from one form to another

61
Q

what is a renewable resource

A

a resource that will replenish over time

62
Q

what is a non renewable resource

A

a resource that will take millions of years to replenish

63
Q

what are charcteristic of renewable energy resources

A

most originate indirectly from the sun

64
Q

what are characteristics of non renewable energy sources

A

formed underground

65
Q

compare and contrast biomass energy and fossil fuels

A

bio mass energy replenishes relatively fast and fossil fuels do not

66
Q

tempatures ____ kinetic energy in an object

A

averages

67
Q

when tempatures rises kinetic energy ___

A

rises

68
Q

what are the types of heat

A

conduction, conversion,radiation

69
Q

what is the first law of therodynamics

A

energy cannot be created nor detroyed

70
Q

what is the second law of thermodynamics

A

hot things will always cool unless you stop them

71
Q

what is an aluminum pizza pam

A

480grams

72
Q

the specfic heat for an aluminum pan

A

0.96g*c

73
Q

how do convection currents form from air

A

they are caused by a difference in tempature

74
Q

what is the difference between reflection and refraction

A

reflection is when waves bounce back and refraction is when waves travel through

75
Q

refraction

A

when a wave travel s from one medium to another it changes speed

76
Q

sound travels fastest in a

A

cast iron

77
Q

longitudinal waves are

A

sound waves

78
Q

traverse waves are

A

waves in a rope

79
Q

frequency

A

the number of repetitions of a periodic process in a unit of time:

80
Q

pitch

A

the measure of sound frequency expressed in terms of Hertz.

science (8 decks)

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