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Science Year 9 > Ms Atkin Physics > Flashcards

Ms Atkin Physics Flashcards

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1
Q

speed =

A

distance ÷ time

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2
Q

units for speed =

A

m/s

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3
Q

acceleration =

A

change in velocity ÷ time

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4
Q

units for acceleration =

A

m/s²

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5
Q

acceleration could also be =

A

(final velocity - initial velocity) ÷ time

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6
Q

v =

A

final velocity

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7
Q

u =

A

initial velocity

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8
Q

a =

A

acceleration

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9
Q

t =

A

time

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10
Q

s =

A

seconds

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11
Q

m =

A

mass or meters

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12
Q

units for deceleration =

A

-n m/s²

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13
Q

scalar quantities =

A 
Distance 
Power
Energy                       d pets 
Time
Speed
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14
Q

vector quantities =

A 
DIsplacement 
VElocity
WEight          dive wefo accmo
FOrce
ACCeleration
MOmentum 
and d pets
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15
Q

units for mass

A

kilograms

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16
Q

definition of thrust

A

increases the velocity of an object

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17
Q

definition of torque

A

changes the rotation of an object

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18
Q

definition of electrostatic force

A

a force that acts between two charges

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19
Q

unit of force

A

newtons

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20
Q

definition of friction

A

when an object slides across a surface

friction slows down the obect

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21
Q

force =

A

mass x acceleration

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22
Q

units for weight =

A

newtons

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23
Q

definition of mass

A

how much matter is in an object

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24
Q

definition of weight

A

the force acting on the matter of an object

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25
Q

the … of an object is … everywhere, but its … can …

A

the mass of an obect is the same everywhere, but its weight can change

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26
Q

the gravitational field strength of earth is =

A

10 N/kg

27
Q

the gravitational field strength of the moon is =

A

1.6 N/kg

28
Q

units for gravitational field strength =

A

N/kg

29
Q

weight =

A

mass x gravitational field strength

30
Q

definition of air resistance

A

the frictional force acting in the opposite direction to the movement of the object

31
Q

1st stage of falling

A

the object accelerates downwards because of its weight

there is little air resistance

32
Q

2nd stage of falling

A

it gains speed and the air resistance increases

33
Q

3rd stage of falling

A

object’s weight is balanced by the air resistance and reaches a steady speed called terminal velocity

34
Q

factors affecting the terminal velocity of an object

A

its mass
its surface area
the acceleration due to gravity

35
Q

stopping distance =

A

thinking distance + braking distance

36
Q

definition of thinking distance =

A

the distance traveled in reaction time of the driver

37
Q

thinking distance can increase if the driver is :

A

tired
distracted
drugs and alcohol
car speed

38
Q

definition of braking distance =

A

the distance taken to stop once the brakes are applied

39
Q

braking distance can increase if :

A 
car's brakes or tyres are in bad condition
poor road conditions
weather conditions
car has a larger mass
car speed
40
Q

resultant force =

A

adding together all the forces that act upon an object

41
Q

momentum =

A

mass x velocity

42
Q

units for momentum =

A

kg m/s

43
Q

p =

A

momentum

44
Q

total momentum … in explosions and collisions

A

total momentum stays the same in explosions and collisions

45
Q

change in momentum =

A

force x time

46
Q

modern cars have safety features that absorb … in collisions

A

modern cars have safety features that absorb kinetic energy in collisions

47
Q

safety features of modern car =

A

crumple zones
seat belts
air bags

48
Q

solar system consists of :

A

the sun
planets and dwarf planets
comets and asteroids
moons

49
Q

there are … planets

A

there are 8 planets

50
Q

the planets are :

A 
Mecury  My
Venus    Very
Earth      Easy
Mars       Method
Jupiter    Just
Saturn    Speeds
Uranus   Up
Neptune Naming
(pluto)     (planets)
51
Q

the further out a planet …

A

the further out a planet, the longer a year takes

52
Q

comets are =

A

balls of ice or dust in orbit around the sun

53
Q

asteroids are =

A

rocky objects, smaller than planets

54
Q

most asteroids are found in =

A

an asteroid belt

55
Q

a satellite is =

A

anything that orbits some thing like a planet, moon, star etc
can be natural or artificial

56
Q

artificial satellites are used for :

A

telecommunications
satnav
spying on other countries
weather forecasts

57
Q

orbital speed of planets and satellites =

A

2 x π x (orbital radius ÷ time)

58
Q

stars are formed from =

A

massive clouds of dust and gas in space

59
Q

a galaxy is =

A

immense groups of stars held together by gravity

60
Q

what reaction occurs in stars?

A

nuclear

61
Q

Doppler effect is =

A

change in frequency and wavelength

62
Q

Earths atmosphere contains … % oxygen

A

Earths atmosphere contains 21 % oxygen

63
Q

optical telescopes are used to =

A

observe visible light from space

Science Year 9 (3 decks)

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