Forces Motion And Electricity

Question 1

Unit of speed and velocity

Answer 1

M/s

Question 2

Speed is…

Velocity is…

Answer 2

Speed is how fast you are going

Velocity is the same but the direction is also specified

Question 3

Acceleration =

Answer 3

Change in velocity/tine

Question 4

What is acceleration

Answer 4

How quickly the velocity is changing

Question 5

Distance time graphs

Answer 5

Gradient = speed
Steeper is faster 
Flat is where stopped 
Downhill is going back to starting point
Curves are accel or deccel

Question 6

Velocity time graphs

Answer 6

Gradient = acceleration
Flat is steady speed
Steeper is greater accel or deccel
Curve is changing acceleration

Question 7

Weight =

Answer 7

mass x gravitational field strength

Question 8

Terminal velocity

Answer 8

A final speed you hit when falling, it is related to its weight and drag

Question 9

First law of motion

Answer 9

Balanced forces mean no change in velocity

Question 10

Second law of motion

Answer 10

If there is an unbalanced force than the object will accelerate in that direction
Another word for this is the resultant force

Question 11

Third law of motion

Answer 11

Reaction forces

If you push on something it pushes back and the smallest mass is accelerated further

Question 12

Resultant force =

F

Answer 12

Mass x acceleration

Question 13

Stopping distance =

Answer 13

Whole time to stop

Braking distance + thinking distance

Question 14

Thinking distance

And factors

Answer 14

Distance car travels for driver to react and apply brakes

Speed
Reaction time/state (tired or drunk)

Question 15

Braking distance

And factors

Answer 15

The distance car travels during brakes on to stop

Speed
Mass of vehicle and people inside
State of brakes
Grip - road weather. Tyres.

Question 16

Momentum =
(P)
Kg m/s

Answer 16

Mass x velocity

Question 17

Momentum before =

Answer 17

Momentum after

Question 18

Force =

Answer 18

Change in momentum/time taken for change to happen

Question 19

Crumples zones

Answer 19

Crumple on impact to increase the time taken for a car to stop

Question 20

Seat belts

Answer 20

Stretch slightly to increase the time taken for a wearer to stop
Reduce force on chest

Question 21

Air bags

Answer 21

Also slow you down more gradually

Question 22

A moment is a

Answer 22

Turning effect of a force

Question 23

Moment (nm) =

Answer 23

Force (n) x perpendicular distance between line of action and pivot

Question 24

Centre of gravity

Answer 24

Directly below the point of suspension

Question 25

Force causing orbits

Answer 25

Gravity

Question 26

Gravity decreases as

Answer 26

You get further away

Question 27

Some orbits are

Answer 27

Elliptical (elongated)

Question 28

For a circular orbit the distance travelled is the

Answer 28

Circumference

Question 29

Orbital speed =

Answer 29

(2 x pi x orbital radius)/time

Question 30

Speed =

Answer 30

Distance/time

Question 31

plastic is an...

Answer 31

insulator

Question 32

the live wire

Answer 32

red wire | alternates between high voltage and low voltage of about 230V

Question 33

the neutral wire

Answer 33

blue always at zero V elect flows through live and out neutral

Question 34

earth wire

Answer 34

green/yellow (colorblind) connected to power supply and is a back up wire there in case fault with main wires connected to the ground

Question 35

fuse/circuit breakers

Answer 35

melt when current is too high to stop shocks or fires

Question 36

circuit breaker more convenient than fuses because

Answer 36

switch- faster | switch-can be switched back on, fuse has to replace

Question 37

power =

Answer 37

current x voltage | Pee on the IVy

Question 38

energy transferred = | j

Answer 38

current x voltage x time | Ee on the IVy Tea

Question 39

Resistance = | ohms

Answer 39

Voltage/current

Question 40

diodide

Answer 40

graph goes steady then upwards curve high resistance one way current the other way

Question 41

metal filament lamp

Answer 41

curve then constant up then curve

Question 42

wire

Answer 42

current through a wire is proportional to voltage

Question 43

LDR light dependent resistor

Answer 43

line box with arrows line downwards curve, resistance decreasing with light intensity resistor used in light sensing units

Question 44

thermistors

Answer 44

line- box with line through on a diagonal -line a temp-dependent resistor temp sensors hot conditions, resistance drops

Question 45

charge = | charge measure in coulombs C

Answer 45

current x time

Question 46

series circuit

Answer 46

all components one after the other along the wire disconnect and circuits breaks fairy lights current same everywhere

Question 47

parallel circuits

Answer 47

disconnect one and will hardly affect others each component has its own loop how most things are household lights

Question 48

one volt is

Answer 48

one joule per coulomb

Question 49

static electricity cause

Answer 49

caused by friction two insulators rub each other one + electrostatic charge loss electrons one - electrostatic charge gain electrons which way depends on material

Question 50

+ + + - - -

Answer 50

repel attract repel

Question 51

charged rod test

Answer 51

suspend a rod with known charge bring another rod towards it if attraction, test rod has opposite charge of suspend rod if repel, test rod is same charge as suspend rod

Question 52

generators that make your hair stick up

Answer 52

Van de Graaff generators

Question 53

static helpful

Answer 53

inkjet | photocopier

Question 54

static problem

Answer 54

lightning | fuel (gas stations)

Question 55

1 amp

Answer 55

1 coulomb per sec

Question 56

voltage =

Answer 56

energy/charge

Question 57

electron charge

Answer 57

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