Science exam forces

Science :-)

Renewable energy

Renewable energy comes from natural resources that are naturally replenished, such as sunlight, wind, and waves. They are from nature and are sustainable.

Global warming

Global warming is the long term warning of the planets overall temperature.

Greenhouse effect

The greenhouse effect is the way in which heat is trapped close to earths surface by greenhouse gases. It keeps the earth warm so our planet can support life. However, some of this heat is trapped by the greenhouse gases in the atmosphere. Burning fossil fuels like coal and oil puts more CO2 into our atmosphere. This CO2 gets trapped in our atmosphere, trapping more heat and causing the climate to get warmer.

Greenhouse gases

Carbon dioxide, methane, nitrous oxide

Streamlining

To design something in a way that causes very little resistance to air flow or water. Streamline increases speed and eases movement.

STREAMLINING REDUCES FRICTION (AIR RESISTANCE)

the first law of motion

the first law is something that is still or will remain still unless a force is applied to it. the first law also states that an object that is in motion will continue to move in the same direction and same speed unless a different force is applied to it.

ex. a football wont move unless u apply a force to it.

the second law of motion

acceleration happens when a force is applied to an object. the heavier the object, the more force will be needed to accelerate the object.

the third law of motion

\- for every action there is an equal and opposite reaction -

this means forces work in pairs. For each force applied, another force will act in the opposite direction. If you let go of an untied balloon, the air will come out in one direction and the balloon will fly off in the opposite direction

4 forces

* gravity
* friction
* magnetism
* buoyancy

gravity

gravity is the force that keeps us and other objects on the ground. It is also the force that keeps all the planets orbit around the sun.

friction

friction is the force that stops or slows us when trying to move an object.

air resistance

air resistance is a type of friction that occurs between the air and another material.

magnetism

magnetism is the force that occurs when a magnet pulls a metal object or another magnet.

examples of magnetic materials

Iron nickel cobalt

What are also called fossil fuels

coal oil and natural gas

Non renewable energy

non renewable energy comes from natural resources that are not naturally replenished such as coal and natural gas.

buoyancy

is the force that pushes an object upwards in a fluid.