Ms Atkin Physics Flashcards
1
Q
speed =
A
distance ÷ time
2
Q
units for speed =
A
m/s
3
Q
acceleration =
A
change in velocity ÷ time
4
Q
units for acceleration =
A
m/s²
5
Q
acceleration could also be =
A
(final velocity - initial velocity) ÷ time
6
Q
v =
A
final velocity
7
Q
u =
A
initial velocity
8
Q
a =
A
acceleration
9
Q
t =
A
time
10
Q
s =
A
seconds
11
Q
m =
A
mass or meters
12
Q
units for deceleration =
A
-n m/s²
13
Q
scalar quantities =
A
Distance Power Energy d pets Time Speed
14
Q
vector quantities =
A
DIsplacement VElocity WEight dive wefo accmo FOrce ACCeleration MOmentum and d pets
15
Q
units for mass
A
kilograms
16
Q
definition of thrust
A
increases the velocity of an object
17
Q
definition of torque
A
changes the rotation of an object
18
Q
definition of electrostatic force
A
a force that acts between two charges
19
Q
unit of force
A
newtons
20
Q
definition of friction
A
when an object slides across a surface
friction slows down the obect
21
Q
force =
A
mass x acceleration
22
Q
units for weight =
A
newtons
23
Q
definition of mass
A
how much matter is in an object
24
Q
definition of weight
A
the force acting on the matter of an object
25
the ... of an object is ... everywhere, but its ... can ...
the mass of an obect is the same everywhere, but its weight can change
26
the gravitational field strength of earth is =
10 N/kg
27
the gravitational field strength of the moon is =
1.6 N/kg
28
units for gravitational field strength =
N/kg
29
weight =
mass x gravitational field strength
30
definition of air resistance
the frictional force acting in the opposite direction to the movement of the object
31
1st stage of falling
the object accelerates downwards because of its weight
| there is little air resistance
32
2nd stage of falling
it gains speed and the air resistance increases
33
3rd stage of falling
object's weight is balanced by the air resistance and reaches a steady speed called terminal velocity
34
factors affecting the terminal velocity of an object
its mass
its surface area
the acceleration due to gravity
35
stopping distance =
thinking distance + braking distance
36
definition of thinking distance =
the distance traveled in reaction time of the driver
37
thinking distance can increase if the driver is :
tired
distracted
drugs and alcohol
car speed
38
definition of braking distance =
the distance taken to stop once the brakes are applied
39
braking distance can increase if :
```
car's brakes or tyres are in bad condition
poor road conditions
weather conditions
car has a larger mass
car speed
```
40
resultant force =
adding together all the forces that act upon an object
41
momentum =
mass x velocity
42
units for momentum =
kg m/s
43
p =
momentum
44
total momentum ... in explosions and collisions
total momentum stays the same in explosions and collisions
45
change in momentum =
force x time
46
modern cars have safety features that absorb ... in collisions
modern cars have safety features that absorb kinetic energy in collisions
47
safety features of modern car =
crumple zones
seat belts
air bags
48
solar system consists of :
the sun
planets and dwarf planets
comets and asteroids
moons
49
there are ... planets
there are 8 planets
50
the planets are :
```
Mecury My
Venus Very
Earth Easy
Mars Method
Jupiter Just
Saturn Speeds
Uranus Up
Neptune Naming
(pluto) (planets)
```
51
the further out a planet ...
the further out a planet, the longer a year takes
52
comets are =
balls of ice or dust in orbit around the sun
53
asteroids are =
rocky objects, smaller than planets
54
most asteroids are found in =
an asteroid belt
55
a satellite is =
anything that orbits some thing like a planet, moon, star etc
can be natural or artificial
56
artificial satellites are used for :
telecommunications
satnav
spying on other countries
weather forecasts
57
orbital speed of planets and satellites =
2 x π x (orbital radius ÷ time)
58
stars are formed from =
massive clouds of dust and gas in space
59
a galaxy is =
immense groups of stars held together by gravity
60
what reaction occurs in stars?
nuclear
61
Doppler effect is =
change in frequency and wavelength
62
Earths atmosphere contains ... % oxygen
Earths atmosphere contains 21 % oxygen
63
optical telescopes are used to =
observe visible light from space
