Electricity

You know, I think I’m just going to stop doing these introductions because I really have nothing to say. So here’s to the last intro.

Electric charge:

Some materials become charged with electrostatic charge (or static electricity) when rubbed. What is this and what causes it?

There are 2 different and opposite types of charge:positive and negative charge. Like charges repel, opposite charges attract. The closer the charges the greater the force between them.

Where does charge come from? As we know, all matter is made up of atoms. These atoms have electric charges inside them, there is a nucleus made upon protons and neutrons. Overall the charge in the nucleus is positive because protons have a +ve charge and neutrons have no charge. Whizzing around the nucleus are tiny particles called electrons have -ve charge. These two charges cancel out so that the net charge of a material is zero. However, when 2 materials are rubbed together, electrons may be transferred from one to the other, so that one material is left with negative charge and the other with positive. So remember: rubbing materials together does not make electric charge, it simply separates charges that are already there.

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Rays and Waves

Hi guys, so here’s another post. this one is similar to the one about waves and sounds, but this focuses more on light. Lets get on with it then!

Light rays and waves:

In order to be able to see stuff, light must enter your eyes. The sun, the lamps in your house and your computer screen emit their own light, they are said to be luminous objects. Most objects, however, are non-luminous, and the only reason that you can see them is because they reflect light, and this enters your eyes. Heres what: most surfaces are uneven or contain particles that scatter light. As a result, they reflect light in all directions. The reflection is diffuse. Mirrors, on the other hand, are smooth, completely plane and shiny. Their reflection is regular. Black surfaces absorb all light, and some transparent materials like glass and water will let light pass right through them. They transmit light.

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What Does The Future Hold?

WHAT!? No Physics today!! I have been challenged to the future challenge by Missing the Muse, so thanks for that. So apparently this is a challenge in which you are supposed to predict your own future. Now, I’ve never had my future predicted, because I don’t believe in it (and its way too expensive). But anyways, I’ll give it a shot and take my prophecy from the department of mysteries in the Ministry of Magic, and I’ll try not to destroy all the time turners on my way out. Potter-heads, you know what I’m talking about.

Anyways, where do I see myself in the future? I will…

  • Be in space
  • Be Hogwarts’ new headmaster
  • Have a hover board.
  • Know the plot of Star Wars Episode VII
  • Know what I’m doing

Boom! There you have it! So now I have to challenge 5 others…

1. Mathblogger101

2. Dragallur

3. Deep blues and sea foam greens

4. @shane

5. The realm of the chaos fairy

All righty then! What now? Your mission, should you chose to accept it, is to:

  • Thank the blogger who nominated you: Cheers Dan Hoger
  • Link back to the challenge creator, in order to track the challenge’s process and get more hits on her blog! (hit 2 birds with one stone or whatever). So: Link Dreams and movie screens.
  • Share 5 things about your future
  • Challenge 5 different bloggers.

This message will NOT self-destruct in 5 seconds. So apparently I have to finish with something cool so…

“SOMETHING COOL!” – Jenko, 22 jump street.

Waves and Sounds

Hullo. I’ve run out of ideas to say for this little ‘introduction’. So why don’t we just jump into the realm of waves and sounds.

Transverse and longitudinal waves:

I’m sure you’re all familiar with waves: waves in a pond, those sciencey invisible waves that transmit your TV channels and those heat waves in the summer (even though those aren’t the physical waves we mean when saying ‘waves’). If you drop a stone into a pond, ripples spread across the surface of the pond. these waves carry energy, as you can tell from the movements they cause at the water’s edge. Yet there is no flow of water across the pond, the wave effect is just the result of up-and-down motions in the water. These are not the only types of waves. There are two main types of waves:

Transverse wave: This is the ‘classic’ wave:

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Thermal Effects

Wow! Posting again? This is really getting out of hand. As you may have guessed, I have done almost everything there is to do to celebrate my holiday, but now I’m running out of ideas, so I just decided to get ready for the upcoming school year. Here’s a post about, yes, you guessed it! Thermal effects.

Moving particles:

All materials and their behaviour can be described by a model called the kinetic theory. According to this theory, all matter is made up of atoms or molecules. These particles are said to be in constant motion, also, the particles attract each other stronger when close together but weakly when far apart. This causes the particles bond to neighbouring particles if close by.

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Forces and Energy

Here I am again, and today I’ll be talking about Forces and Energy, as you probably already guessed. Again, this is a follow on post from yesterday, about the stuff that we have learnt in GCSE level, and I’ll probably need to remember this stuff for my next two years of study too. Here we go!

Work and energy:

To scientists, work is done whenever a force makes something move. You can see this definition reflected in the definition of a Joule (the SI Unit of work): 1 joule of work is done when a force of 1 newton moves an object 1 metre in the direction of the force. The formula:

Work done = force * distance moved   (W =  F * d)

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Forces And Pressure

Why hello! Yes I am back again after a very long (and i might add well deserved) HOLIDAY!!! However I feel that some of the stuff I learnt for my GCSEs may have been lost somewhere in the back of my brain. So its time to return to blogging and summarise the GCSE chapter on forces and pressure.

Forces and turning effects:

The turning effect of a force is called a moment. The moment of a force is also called a torque.

Moment of a force about a point = force * perpendicular distance from the point (Moment= fd)

A moment (Credit)

A moment (Credit)

The principle of moments: If an object is in equilibrium: the sum of the clockwise moments about any point is equal to the sum of the anticlockwise moments about that point. In short: there is no moment, therefore the object remain still (or moving at constant speed because of inertia), so it is in equilibrium.

Moments are described as being clockwise or anticlockwise.

Conditions for equilibrium:

  • For an object to be in equilibrium, the forces as well as  their turning effects must balance. So:
  • The sum of the forces in one direction must equal the sum of the forces in the other direction
  • And the principle of motions must apply.

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