Physics Homework

Basic Physics Concepts Every Student Needs To Master

Most people, especially students, have the perception that physics is hard; no wonder they are unable to study without help with physics homework. Well, it can be if you think of it as a complex course that requires deep mathematical application and problem solving skills of a genius. Have you ever thought about the fact that physics is in fact all around us? Did you know that by relating physics to daily living, you position yourself for success in the subject and life in general? Think about it; why did you take the turn on that spot when changing lanes? How did you manage to load that carton onto the truck all alone when it is practically impossible to even lift it?

By understanding the basic concepts in physics, students are better equipped with knowledge to innovate, and at the present time, pass their exams. Here are some concepts you must master as a physics student;

     

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1. The laws of motion (law of classical mechanics)

We all know Isaac Newton, right? Scientific literature tells us that he once took a rest under an apple tree and the falling of an apple led him to formulating the 3 laws of motion. While it might appear that he came up with the laws in that very moment, the truth is that it took years to explain and prove that the laws were actually valid;

  • First law: a stationary object will remain in the same position unless an external force is applied; a moving object will continue to move with uniform speed unless an external force causes it to act otherwise.
  • Second law: the force of an object is the product of its mass and the acceleration with which it is moving (F=ma).
  • Third law: if an object applies force on a second object, there will be an equal force produced by the second object and exerted on the first object.

It is easy to find applications for these laws of motion; a stationary ball remains on the same spot until someone moves or kicks it; a passenger sitting in a moving bus appears motionless until the bus suddenly stopped. In relation to the second ball, think about how far a ball would go if kicked with your right foot (assuming you are right-handed) versus the left foot. Lastly, if you punch a hard surface, be ready to deal with a few broken fingers.

A physics tutor who has experience offering Physics HW help services can teach you to master these laws with ease.

2. Electromagnetism

We cannot talk about electromagnetism and fail to mention radio waves, electricity and light. Electromagnetism is the force which is generated when electrons begin to move. The matter through which the electrons are moving and the type of electrons involved determine the force created. In magnets, the configuration of materials imposes a force on like-charged particles found in other materials; no wonder a coin will cling to a magnet and not a piece of wood.

If you find the above explanation confusing, think of all energy forms in your environment as some form of electromagnetic wave. As a matter of fact the subject of electromagnetism is quite broad as you might have already been told by Physics Homework Help Online tutors.

3. Theory of relativity

The theory of relativity tries to make sense of all the force acting upon a certain point at various states of motion. Consider a moving vehicle that has the top part open; if the car is moving at a velocity of 60 mph, and a ball is thrown upwards from the car, what exactly is happening to the ball?

An area where the theory of relativity is often used is in explaining the movement of the earth around the sun. It is true that the earth moves at a speed of 67,000 miles per hour but we do not feel it. To better understand this theory, we must consider the absolute speed limit, an analogy that Albert Einstein came up with to contextualize relativity. His observation was that there was a speed level that could not be exceeded regardless of the relativity.

To understand relativity, ask yourself this question; how fast is a car moving past you relative to if it was moving towards you (assuming all other aspects remain constant)? The speed would be the same! Well, relativity is the closest realization of split-second. If you are moving at high speed, time will appear to slow down. This simply means that speed is inversely proportional to time.

If you still do not get a grasp around this concept, consider physics assignment help to keep up with the expectations of your professor.

4. Thermodynamics

Thermodynamics is a topic in physics that examines the relationship that exists between heat, mechanical work and energy. There are four laws of thermodynamics;

0th law: in the event that 2 systems are in thermal equilibrium with a third system, the first two systems must have thermal equilibrium between them.

1st law: energy can neither be created nor destroyed but it can be changed from one type to another with the application of heat, internal energy or work.

2nd law: the entropy of the universe as a whole will continue to increase with time; the change in entropy as far as the universe is concerned will always be positive. In other words, this law states that heat cannot be transferred from a body with a lower temperature to another with a higher temperature unless there is external energy.

3rd law: a perfectly crystalline structure at 0 Kelvin has zero entropy (waste energy). If a perfect crystal is heated, the value of the temperature measure indicates movement within the physical system so entropy can never have a negative value.

The above laws have been derived from the basic perception that heat is a direct effect of molecular movement. At the physical level, physics homework helpers interpret temperature to be the degree of heat of cold; atomic movement is the atomic level perception of temperature. When it is hot outside, the energy of the sun causes the vibrations in the atmosphere. The rate of vibration is what is felt on the skin as either cold or heat.

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