Everything I Need To Know

Question 1

How can car be designed to reduce friction

Answer 1

Make shape aero dynamic shape only cause a small amount of drag

Question 2

What affects thinking distance

Answer 2

How fast your going

Affected by something e.g drugs, alcohol. Tiredness and distractions

Question 3

What 4 things affect braking distance

Answer 3

How fast your going
How good are your brakes
How good tyres
How good grip is on the road

Question 4

What happens when a force moves an object through a distance

Answer 4

Work done

Question 5

What causes gravitational potential energy on a object

Answer 5

Height in gravitational field

Question 6

What is kinetic energy

Answer 6

Energy of movement

Question 7

What is hooked law

Answer 7

Extension of a spring is directly proportional to the force applied

Question 8

What affected the power of a car

Answer 8

Power of car engine

How steam,in the car is and how aerodynamic the car is

Question 9

What is the rule of momentum

Answer 9

Momentum before a collision is equal to the momentum after

Momentum is conserved

Question 10

What are the 4 ways cars are designed to convert energy

Answer 10

Crumple zone - absorbs energy and changes shape increases imapct Tim decreasing force
Side impact bars - string metal tubes in side of car doors help direct kinetic energy away from passengers
Seat belts - increases time for wearer to stop reducing force
Air bags - reduces force acting on passengers

Question 11

What is the voltage and current like in a series circuit

Answer 11

Current stays same

Voltage - shared and resistance is shared

Question 12

What is the series circuit like

Answer 12

Connected in a line end to end
Only voltmeters are connected parallel
Disconnect one component rest won’t work

Question 13

What is current and and voltage like in a parallel circuit

Answer 13

Voltage same

Current shared

Question 14

What are the features of a parallel circuit

Answer 14

Each component connected seperatly connected to positive and negative supply
If disconnect one still works

Question 15

What happens when two objects interacte

Answer 15

Forces they exert are equal and opposite

Question 16

What is the uk main supply and frequency what type of supply is this

Answer 16

230 volts 50 hertz and alternating current

Question 17

What is alternating current

Answer 17

Constantly changing directions

Question 18

What is direct current

Answer 18

Current keeps flowing in same direction

Question 19

What are 9 dangers in home

Answer 19

King cables 
Frayed cables
Cables wet
Shoving into sockets 
Damaged plugs too many in one socket

Question 20

What is the blue, brown and yellow and green wires known as what do they do

Answer 20

Blue neutral
Brown live alternates negative and positive supply of mains
Green and yellow- earth wire protects people puts electricity into ground

Question 21

What are the feature is plug

Answer 21

Metal parts copper or brass to conduct electricity

Plastic outer casing protect from getting electri shocked

Question 22

How do the earth wire and fuse keep you safe

Answer 22

When there is a fault too much current flows through live wire to earth wire
If surge of current too strong melts fuse which means supply cuts off

Question 23

Why are all metal cased appliances wired with earth wire

Answer 23

To orevent electric shock

Question 24

What can be used instead of fuses and benefits

Answer 24

Circuit breakers
When current gets to strong it opens circuit which stops circuit
Can be out back into place to reset it
Don’t have to replace but can be exoensive

Question 25

What did the golden leaf experiment do what did they expect and gather

Answer 25

Expect all alpha deflect back Alpha went through which showed mostly empty space Some alpha particle came back shows most mass at nucleus Nucleuse large positive charge as it repoelled

Question 26

What is an isotope

Answer 26

Different forms of same electron same number of protons but different neutrons

Question 27

Why do radioactive material undergo radioactive decay

Answer 27

Give out radiation as they are unstable isotopes

Question 28

What three ways can background radiation come from

Answer 28

Cosmic rays , rocks and human made e.g nuclear fisson

Question 29

Why are alpha and beta particles affected by magnetic and electric fields

Answer 29

Be deflected as they have opposite charges

Question 30

What is nuclear fisson what two substances needed for it to happen

Answer 30

Splitting of particles | Uranium and plutonium

Question 31

Why does nuclear fisson have a chain reaction

Answer 31

``` Neutrons absorbed by uranium or plutonium Makes nucleus unstable = split Form two new nuclei Spit out neutrons Both react process happens again ```

Question 32

What is nuclear fusion

Answer 32

Tow light nuclei join together to form larger nucleus

Question 33

What is the cycle of a star bigger than sun

Answer 33

Form dust could = protostar Gravitational forces = hit temp = nuclear fisson gives out light and heat Main sequence star stable Hydrogen runs out helium fisson swells to super red giant Neutron star into back hole

Question 34

Cycle of a star smaller than sun

Answer 34

Dust cloud by gravity = protostar Forces = really hot nuclear fisson takes place and gives out light and heat Main sequence star Hydrogen runs out helium fisson causes swelling Red giant Whit dwarf Black dwarf