Physics P8

Created by

Abc

Cards (21)

What is the thinking distance
How far the car travels during the driver's reaction time
What are the 2 factors that affect thinking distance
The speed of the car and the reaction time
What is the braking distance
The distance taken to stop under the braking force
What happens to the braking distance if the speed is doubled
The braking distance increase by 4x
What are the 3 main types of fossil fuel
Crude oil, Natural gas and coal
How are fossil fuels made
Plants and animals remains are buried for millions of years.
Why are biofuels seen as carbon neutral even though they produce carbon dioxide
This is because they were collected from plants which collected CO2. There is no overall release in CO2
Are biofuels renewable
Yes if managed properly
What are the 2 things we need to know about mains supply
Alternating current of 230V and 50 Hz
What colour is the neutral wire
blue
What colour is the earth wire
green and yellow
What colour is the live wire
brown
What does the live wire do
Carries the current to the appliance. It has a p.d. of 230v
What does the earth wire do
The earth wire is a safety wire to stop the appliance becoming live. It has a p.d. of 0v
What are the disadvantages of fuses
They are only a one time use
What is the order for the solar system
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune
What are asteroids made out of
rock and metal
What are comets made out of
Ice and dust
What is the beginning of a star
Cloud of dust and gas called the nebula. The force of gravity causes all of this dust and gas particles to come together forming a protostar
What happens when the temperature of the protostar increase 
Hydrogen nuclei start to fuse together to form helium nuclei. This releases a lot of energy and the protostar has no become a main sequence star
What are S-waves
Secondary waves that move slowly and can't go through liquids. They are transverse