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SCIENCE FINAL 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
momentum is equal in ____ but in _____
size, opposite direction
26
what is the SI unit for Pressure
pascal
27
70N/m is = to?
70 pascal
28
what is the pascal principle
a change in a fluid in a closed container, trasmitted equally and uncharged in all direction
29
lift-
upward force acting on a wing of an airplane or bird in flight
30
what does strength of a bouyant force depend on
the objects volume
31
fluid-
a substance that flows and takes the shape of a container
32
as altitude _____ the air pressure ____
increases, decreases
33
bouyant force acts on ____
any object in liquid
34
if an object sinks the weight is ___ then the bouyant force
greater
35
what is the SI unit for work
joules
36
The SI unit for power is
watts
37
10 x 0.9 =
9.0 joules
38
what is the formula for power
p = work / change in temapture
39
machine-
a device that can multiply force
40
reducing friction in a machine increases what?
effinciny
41
what is an axe
a simple machine called a wedge
42
what is an example of a wheel and axle
steering wheel or door knob
43
what is a screw
an inclined place wrapped around a cylinder
44
effort force
the force used to move an object over a distance
45
fulcrum-
the pivot around which a lever turns
46
resistance force-
the vector sum of numerous forces
47
compound machine-
two or more simple machines working together
48
watts and horsepower are both units of ????
power
49
work is ____
the transfer of energy
50
gravtitaional potential energy-
mass and acceleration due to speed
51
what are examples of elastic potential energy
wind up toy, compressed basketball, stretched rubber band, pole vaulters pole
52
mechanical energy is stored in what
gasoline and in food
53
what does walking/ running convert into
chemical energy --> mechanical energy
54
what does eisteins equation deal with
nuclear fission and fusion
55
biomass energy-
chemical energy stored into living things
56
energy increases when ____
work Is done
57
if the mass doubles the kinetic energy ____
doubles
58
what are the types of energy
kinetic, potential, and energy in the feilds
59
what do wind turbines convert to
kinetic energy --> electrical energy
60
energy conversion-
energy changing from one form to another
61
what is a renewable resource
a resource that will replenish over time
62
what is a non renewable resource
a resource that will take millions of years to replenish
63
what are charcteristic of renewable energy resources
most originate indirectly from the sun
64
what are characteristics of non renewable energy sources
formed underground
65
compare and contrast biomass energy and fossil fuels
bio mass energy replenishes relatively fast and fossil fuels do not
66
tempatures ____ kinetic energy in an object
averages
67
when tempatures rises kinetic energy ___
rises
68
what are the types of heat
conduction, conversion,radiation
69
what is the first law of therodynamics
energy cannot be created nor detroyed
70
what is the second law of thermodynamics
hot things will always cool unless you stop them
71
what is an aluminum pizza pam
480grams
72
the specfic heat for an aluminum pan
0.96g*c
73
how do convection currents form from air
they are caused by a difference in tempature
74
what is the difference between reflection and refraction
reflection is when waves bounce back and refraction is when waves travel through
75
refraction
when a wave travel s from one medium to another it changes speed
76
sound travels fastest in a
cast iron
77
longitudinal waves are
sound waves
78
traverse waves are
waves in a rope
79
frequency
the number of repetitions of a periodic process in a unit of time:
80
pitch
the measure of sound frequency expressed in terms of Hertz.

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