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science unit 2 Flashcards

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1
Q

if u travel to the moon does ur body mass change

A

no the amont of matter in u body has not changes

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2
Q

if travelled to the moon would ur weight change

A

yes the force of gravity on earth is 6x stronger then the force of gravity on the moon

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3
Q

what is the metric unit for force and who is it named after

A

the metric unit for force is the newton named sir issac newton

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4
Q

if gravity changes does the mass of an object change

A

no

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5
Q

does the weight of an object change if gravity changes

A

yes

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6
Q

what is the metric unit for change

A

newton

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7
Q

what are the 2 catagories of force with examples

A

contact force [a ball hitting a racket] and action at a distance [gravity]

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8
Q

what force causes a sliding object to slow down

A

the earths gravity

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9
Q

what device is commanly used to mesure force

A

newtons gauge or spring scale

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10
Q

components

A

parts of a system

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11
Q

mehanical system

A

group of parts that interact with each other and function as a whole to do something

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12
Q

force

A

a push or pull that act on an object

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13
Q

contact forces

A

any force that occurs as a result of two objects making contact with each other

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14
Q

friction

A

a force that opposes the relitave

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15
Q

action at a distance

A

forces that can push or pull objects without touch them at all

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16
Q

gravity

A

the attraction between 2 objects due to their mass

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17
Q

weight

A

the amount of force on an object due to gravity

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18
Q

mass

A

the amount of matter

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19
Q

spring sale

A

a spring with a hook on the end used to measure force

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20
Q

2 forms of energy

A

kinetic energy {electrical and thermal energy} potential energy { a heavy rock falling t the ground

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21
Q

what do plants store as they grow

A

chemical energy

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22
Q

how are u able to do work

A

chemical potential

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23
Q

as energy iss trnsfered some amount of what is always produced

A

thermal energy

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24
Q

example of kinetic and potential energy

A

anything moving kinetic anything that is not moving or has the potential to move potential

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25
what energy does an object gain when u lift it
grvitatinal potental energy
26
when friction works on an object or mechanical system what form of energy is always produced
thermal energy
27
work
Activity involving mental or physical effort done in order to achieve a purpose or result. where energy is transfered
28
energy
the ability to do work
29
kinetic energy
energy of an object in motion
30
potential energy
energy that is stored
31
grvitatinal potential energy
potential energy of an object about to fall
32
how do elavators help people 2pouints
disabled people can go up and down buildings without assistance and people can make buildings taller
33
what does a wrench do
multiples force
34
3 ways machines make work easier
increasing the amount of force that is applied, increasing the distance over which the force is applied, or changing the direction in which the force is applied.
35
what does a nutcacker do
incrase applied force
36
what does a ramp do
the distance that a cart is moves increases and thus the force applied decreases
37
3 machines u use every day
stairs phone tv
38
machines make work easier by making it so
the output force is grater then the input
39
machine
any machanical system
40
input force
the force that is appplied to the machine
41
output force
the force that the machine applies to the object
42
ideal machanical advantage
machine adavantage of a machine with no friction
43
describe a machanical system
a pulley is a machine consisteing of a groved wheel with rope or cable used to pull things up or down
44
list 6 simple machines
pully leaver wedge screw ramp wheeel and axel
45
what is the great pyran=mids of Giza and why do u think its one of the 7 wonders of the world
it's a 150m high pyramids that took 20y to assemble and is made of 2.3 mil blocks with masses between 1 and 35 thousand kilograms and is 4500 years old
46
What inferences can u make about the Egyptians
It can be inferred that ancient Egyptians respected their pharaohs by abiding by this they build massive pyramids just fo them
47
mechanism
a system or structure of moving parts that perform some function
48
simple machine
any of the basic mechanical devices for applying a force
49
lever
a rigid bar that is supported at one point
50
fulcrum
the point on the leaver
51
pulley
a wheel with a rope or cable wrapped around it
52
inclined plane
a sloping surface on which an object can move
53
machanical system
2 or more simple machines working together
54
when shopping how do people try to sell u on their product
they tell u abiout the benifits how much cheaper it is and give u deals or coupons
55
first class lever ex
a pry to open paint
56
second class lever ex
soda bottle opener
57
third class lever example
garden rake
58
whenever a machine is used to do work parts of the machine are?
moving
59
what force appears when a pulley wheel rotates on its shaft
friction
60
what do high efficiency machines produce less of
heat
61
what does input work get changed into
useful output work
62
when a ----- does work its energy is transformed from one form to another
machinism
63
why isnt the efficiancy of any mechine a hundred percent
some of the input work is used to compensate for the work done by friction
64
what is the best way to reduce friction
a lubricant like grease or oil
65
what would an ideal machine not have and why
no friction cuz all the input work would be converted into useful output work
66
a car transfors chemical energy into
kenetic,sound,light and thermal energy
67
two efficiant mechinisms
electrical generators and Olympic track bikes
68
2 not efficiant mechinisms
solar cells and gas powered cars
69
components of the school system 8pts
teachers, books, rules, principal ,busses desks, chair and kids
70
what do non mechanical systems ussualy include
an oranizatinal system that benifits a system
71
what has to happen for a non-mech system to work properly
the components of a system have to work together
72
mech parts of a transpot system
busses trains and subways
73
non mech parts of a subway
drivers routes and scedules
74
what do societys systems do
improve our standard of living
75
how do non mech systems become part of our society
thay are oftern created for a need
76
what ia the best star child care program and why was it created
it was made to help people with there kids when the parents go to work
77
what has to happen after a system is put in place
it has to be constantly monitored to make sure its working
78
what must a consumaer be provided with in order for a system to work efficiently
information and support
79
what does systems need organization mean to u
if u dont keep the system tidy and in order it will slowly fall apart
80
chosse a system of ur own describe the mech and non mech [reasturaunt]
mech;digital menus,the qr cdes and the tv's non mech;tables chairs,people and phiscal menus
81
what needs does a libary fufil describe any interaction between 2 compontents
a libary allows people to get books for free an interaction would be between a person reading a book
82
non-mechanical systems
Non-mechanical systems are systems that do not primarily rely on physical machinery or moving parts to function.
83
compnents
parts of the system
84
consumer
a person who uses the goods or sevesses provided by a system
85
what are the pros and of shopping at the mall as opposed to shopping online
pros for shopping at the mall-you can try stuff on and see what ur buying firsthand e
86
what are the pros of shopping at the mall as opposed to shopping online
cons for shopping at the mall u have to walk around and the mall may close
87
what are the advantages of welll desined systems
they have improved productivity allowing work to be done faster
88
what are the pros of mass production
they are fast to make and cost less to make and to buy
89
what are the cons of mass production
mass production goods are often lower quality
90
3 inpacts that autmation has had on our society
work done by workers is now being done using robots, the popularisation of automation created new fields of work, businesses can now sell products for cheaper cuz it costs less to make
91
pros of using plastic bags
durible and lasts a long time
92
cons of using plastic bags
takes years to decompose and are bad for the enviorement
93
productivity
the amount of output that is produced per unit of time
94
automated system
a system that replaces human workers with machines
95
describe an automated system
Elevators are cars that move in a vertical shaft to carry passengers or freight between the levels of a multistory building.
96
descrbe the image u are drawing on the test
a wheel with a rope or cable wrapped around it

science gr 8 (3 decks)

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