Physics Ass 1 Flashcards
What are the three main fossil fuels?
Coal,oil and natural gas
Why cant we replace non-renewable energy sources?
Because we cant replace them as quickly as we are using them
Can renewable energy sources be replaced?
Yes as we can replace them as quickly as we are using them
What are the 7 renewable energy sources?
Solar,geothermal,tides,wind,bio-fuels,water waves,hydro-electricity
How does the geothermal source create energy?
It uses energy from the thermal energy stores of hot rocks below the earths surface.
How does hydro-electric power create energy?
It involves builiding a dam across a valley, water is allowed to flow out through turbines which generates electricity.
How does wave power create electricity?
Turbines are built around the coast and are turned by water waves and create electricity.
What are biofuels created from and what can they be burnt for to produce what?
Biofuels are created from plants and animal dung they can be burnt to produce electricity to run cars in the same way as fossil fuels.
What do biofuels produce when burnt?
Carbon dioxide (co2)
Although burning plants and animal dung creates co2 what is the good side of it?
The plants used to make biofuels will have absorbed a lot of carbon dioxide while they were growing
What leads to many animals losing their natural habitats?
Larg areas of forest have been cleared to create room to grow biofuels.
Are biofuels reliable?
Biofuels are fairly reliable as they can be constantly produced and stored for when they are needed.
What are the negatives of burning coal,oil and gas?
They release co2 into the atmosphere when burned which leads to global warming. Burning coal and oil releases sulfur dioxide which causes acid rain.
How can acid rain affect the environment?
Acid rain makes lakes and rivers acidic, which can kill animals and plants. It can also damage trees and soil.
How does coal mining affect the landscape?
It makes a mess of the landscape and destroys animals and plants natural habitats.
How do oil spills cause big environmental problems and harm sea creatures?
They can trap the animals and kill them in the oil and it can cuase environmental problems through stopping plants from growing.
What are the negatives of nuclear power?
It is very dangerous and difficult to get rid of.
What risks does nuclear power carry?
If a big accident happens it could release a lot of radiation like the Fukushima disaster in Japan
Vector quantities have a magnitude (size) and a direction. For example:
Vector quantities: force,velocity,displacement,acceleration
Some quantities have a magnitude but no direction. These are called scalar quantities, for example:
Speed,distance,mass,temperature and time
What does the length of an arrow show?
The magnitude
What does the direction of the arrow show?
The direction of the quantity
What is a force?
A push or pull that acts on an object
Name 4 examples of contact forces
Friction,air resistance,tension, normal contact force
Name 3 non contact forces
Magnetic force, gravitational force,electrostatic force
When two objects interact, a force is produced on both objects. The forces on the two objects are equal in size but act in opposite directions. What are these 2 forces called?
An interaction pair
State an example of a interaction pair
The gravitational attraction between the Earth and the sun
What is mass measured in and what is the defenition of it?
Mass is measured in kg and the defenition is the amount of matter (stuff) in an object.
What can weight be measured with and what is it measured in?
It can be measured with a calibrated spring balance or a newtonmeter, it is measured in newtons.
What do you need to do to change a shape of a item.
You need to have more than one force acting on the object. One force would just move the object, not change its shape.
