science unit 2 Flashcards

win

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
Q

what energy does an object gain when u lift it

A

grvitatinal potental energy

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26
Q

when friction works on an object or mechanical system what form of energy is always produced

A

thermal energy

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27
Q

work

A

Activity involving mental or physical effort done in order to achieve a purpose or result. where energy is transfered

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28
Q

energy

A

the ability to do work

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29
Q

kinetic energy

A

energy of an object in motion

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30
Q

potential energy

A

energy that is stored

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31
Q

grvitatinal potential energy

A

potential energy of an object about to fall

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32
Q

how do elavators help people 2pouints

A

disabled people can go up and down buildings without assistance and people can make buildings taller

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33
Q

what does a wrench do

A

multiples force

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34
Q

3 ways machines make work easier

A

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.

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35
Q

what does a nutcacker do

A

incrase applied force

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36
Q

what does a ramp do

A

the distance that a cart is moves increases and thus the force applied decreases

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37
Q

3 machines u use every day

A

stairs phone tv

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38
Q

machines make work easier by making it so

A

the output force is grater then the input

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39
Q

machine

A

any machanical system

40
Q

input force

A

the force that is appplied to the machine

41
Q

output force

A

the force that the machine applies to the object

42
Q

ideal machanical advantage

A

machine adavantage of a machine with no friction

43
Q

describe a machanical system

A

a pulley is a machine consisteing of a groved wheel with rope or cable used to pull things up or down

44
Q

list 6 simple machines

A

pully leaver wedge screw ramp wheeel and axel

45
Q

what is the great pyran=mids of Giza and why do u think its one of the 7 wonders of the world

A

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
Q

What inferences can u make about the Egyptians

A

It can be inferred that ancient Egyptians respected their pharaohs by abiding by this they build massive pyramids just fo them

47
Q

mechanism

A

a system or structure of moving parts that perform some function

48
Q

simple machine

A

any of the basic mechanical devices for applying a force

49
Q

lever

A

a rigid bar that is supported at one point

50
Q

fulcrum

A

the point on the leaver

51
Q

pulley

A

a wheel with a rope or cable wrapped around it

52
Q

inclined plane

A

a sloping surface on which an object can move

53
Q

machanical system

A

2 or more simple machines working together

54
Q

when shopping how do people try to sell u on their product

A

they tell u abiout the benifits how much cheaper it is and give u deals or coupons

55
Q

first class lever ex

A

a pry to open paint

56
Q

second class lever ex

A

soda bottle opener

57
Q

third class lever example

A

garden rake

58
Q

whenever a machine is used to do work parts of the machine are?

59
Q

what force appears when a pulley wheel rotates on its shaft

60
Q

what do high efficiency machines produce less of

61
Q

what does input work get changed into

A

useful output work

62
Q

when a —– does work its energy is transformed from one form to another

63
Q

why isnt the efficiancy of any mechine a hundred percent

A

some of the input work is used to compensate for the work done by friction

64
Q

what is the best way to reduce friction

A

a lubricant like grease or oil

65
Q

what would an ideal machine not have and why

A

no friction cuz all the input work would be converted into useful output work

66
Q

a car transfors chemical energy into

A

kenetic,sound,light and thermal energy

67
Q

two efficiant mechinisms

A

electrical generators and Olympic track bikes

68
Q

2 not efficiant mechinisms

A

solar cells and gas powered cars

69
Q

components of the school system 8pts

A

teachers, books, rules, principal ,busses desks, chair and kids

70
Q

what do non mechanical systems ussualy include

A

an oranizatinal system that benifits a system

71
Q

what has to happen for a non-mech system to work properly

A

the components of a system have to work together

72
Q

mech parts of a transpot system

A

busses trains and subways

73
Q

non mech parts of a subway

A

drivers routes and scedules

74
Q

what do societys systems do

A

improve our standard of living

75
Q

how do non mech systems become part of our society

A

thay are oftern created for a need

76
Q

what ia the best star child care program and why was it created

A

it was made to help people with there kids when the parents go to work

77
Q

what has to happen after a system is put in place

A

it has to be constantly monitored to make sure its working

78
Q

what must a consumaer be provided with in order for a system to work efficiently

A

information and support

79
Q

what does systems need organization mean to u

A

if u dont keep the system tidy and in order it will slowly fall apart

80
Q

chosse a system of ur own describe the mech and non mech [reasturaunt]

A

mech;digital menus,the qr cdes and the tv’s non mech;tables chairs,people and phiscal menus

81
Q

what needs does a libary fufil describe any interaction between 2 compontents

A

a libary allows people to get books for free an interaction would be between a person reading a book

82
Q

non-mechanical systems

A

Non-mechanical systems are systems that do not primarily rely on physical machinery or moving parts to function.

83
Q

compnents

A

parts of the system

84
Q

consumer

A

a person who uses the goods or sevesses provided by a system

85
Q

what are the pros and of shopping at the mall as opposed to shopping online

A

pros for shopping at the mall-you can try stuff on and see what ur buying firsthand e

86
Q

what are the pros of shopping at the mall as opposed to shopping online

A

cons for shopping at the mall u have to walk around and the mall may close

87
Q

what are the advantages of welll desined systems

A

they have improved productivity allowing work to be done faster

88
Q

what are the pros of mass production

A

they are fast to make and cost less to make and to buy

89
Q

what are the cons of mass production

A

mass production goods are often lower quality

90
Q

3 inpacts that autmation has had on our society

A

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
Q

pros of using plastic bags

A

durible and lasts a long time

92
Q

cons of using plastic bags

A

takes years to decompose and are bad for the enviorement

93
Q

productivity

A

the amount of output that is produced per unit of time

94
Q

automated system

A

a system that replaces human workers with machines

95
Q

describe an automated system

A

Elevators are cars that move in a vertical shaft to carry passengers or freight between the levels of a multistory building.

96
Q

descrbe the image u are drawing on the test

A

a wheel with a rope or cable wrapped around it