Topics in PhysicsRelative Density of Substances and Specific Gravity Types of Heat Transfer: Conduction Types of Heat Transfer: Convection Types of Heat Transfer: Radiation Physics Scheme of Work, SS1, First Term Physics Scheme of Work, SS1, Second Term Physics Scheme of Work, SS1, Third Term Velocity and Acceleration Newton's Laws of Motion Importance of Gravity What is Density? Density of various Substances Concepts of Force and Motion Motion and Speed Concept of Heat Transfer Concepts of Heat and Temperature Gravity: What is Gravity? Zeroth Law of Thermodynamics - Thermal Equilibrium Fundamental and Derived Units: Similarities and Differences Physics - Basic and Fundamental Physics Concepts
Academic Questions in Physics
The Law of Inertia is also referred to as _____.
The process whereby the velocity of an object increases and decreases over a period of time is best associated with the term _____.
The rate of motion is best referred to as _____.
Consider this expression below:
A body X exerts a force FX on another body Y. In return, body Y exert a force FY back on body X. The forces FX and FY are equal in magnitude but opposite in direction.
Putting the above expression into equation:
FX = -FY
Where FX is the action force
FY is the reaction Force
The above expression relates to _____.
The tendency of a body to remain in a state of rest or in uniform motion is referred to as _____.
A change in the position of an object with reference to time is best described as _____.
The saying "what goes up on earth must come down" can be best attributed to _____.
We have _____ laws of Thermodynamics.
Before the zeroth law of thermodynamics was put forward, there had already existed 3 laws of Thermodynamics. These are:
- 1st Law of Thermodynamics
- 2nd Law of Thermodynamics
- 3rd Law of Thermodynamics
Scientists came to a realization that these 3 sets of laws aren't exactly complete with regards to temperature. They envisaged the need for a law that will introduce a formal definition of temperature.
Due to the nature and importance of this law, it needed to supersede the three existing laws. At that time, the three laws (named as 1st, 2nd and 3rd respectively) were already popular in the academic world. Since these three laws are widely known by their numbers, a numbering confusion came up.
The alternative of calling this new law the Fourth Law woundn't be ideal due to it's position and importance. It was Ralph Fowler, a scientist that called the new law the “Zeroth Law" which was a naming caveat that has become popular to this very day.
The Zeroth Law of Thermodynamics states that if two separate bodies are in thermal equilibrium with another body, then they are also in equilibrium with each other.
To better understand what the zeroth law meant, we need to know what thermal equilibrium is;
Two bodies A and B are said to be in thermal equilibrium if each body can transfer heat to each other when placed closed together but ended up NOT transferring any heat to each other.
This will mean that both bodies are at equal temperature.
Now, according to the zeroth law, assuming we have three bodies namely X, Y and Z:
if X = Y and Z = Y, then X = Z
From the above expression, it will be observed that: if X and Y are in thermal equilibrium and Z and Y are in thermal equilibrium, therefore, X and Z must be in thermal equilibrium too.
So we can see that according to the zeroth law, Temperature is a quantity worth measuring.
When we put a pot of water on a cooking gas, we will notice the transfer of heat from the cooking gas to water since the water begins to get warm.
As heat transfer continues, the water becomes warmer and eventually becomes hot. A point will be reached when the water starts to boil. (The boiling boiling point of pure water is 100OC).
Thermal equilibrium for the pure water is reached at 100OC because the water cannot become hotter; instead, it evaporates as water vapour.
Although, Temperature is not directly mentioned in the zeroth law, the law actually points us towards the existence of temperature as a quantity.
It can therefore be stated that Temperature is the quantity that remains constant (the same) for all systems in thermal equilibrium.
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Amazing facts in Physics
Image Credit: Ball and Roller Store
Glass Balls actually bounce higher than Rubber Balls
Every planet has its own unique gravitational force, for instance, Mars has a gravity of 3.711 m/s2 while earth’s gravitational force is 9.807m/s2. Please read on gravity here
When two metals are put together in space, they will stick together as if they are welded. This phenomenon is called cold welding
The fastest animal on land is Cheetah. It can reach a maximum speed of about 113km per hour.
Please read on motion, speed, velocity and acceeration here
NOTABLE POINTS IN Physics
The Classical Mechanics (Laws of Motion) is a fundamental part of Physics.
Below are the Newton's Laws of Motion:
An object at rest will continue in its state of rest; while an object in uniform motion will continue in a straight line, unless an external force acts on it.
Newton's First Law of Motion.
The rate of change of momemtum is proportional to the applied force and will take place in the direction of that force.
Newton's Second Law of Motion.
To every action, there is an equal and opposite reaction.
Newton's Third Law of Motion.
The study of Thermodynamics revolves around the relationship between heat, temperature, energy and mechanical work; and these can be summarised under the 4 laws of Thermodynamics (Numbered zero through three).
Below are the 4 laws of thermodynamics:
Zeroth law of thermodynamics – If two thermodynamic systems are each in thermal equilibrium with a third, then they are in thermal equilibrium with each other.
1st law of thermodynamics – Energy can neither be created nor destroyed but can be changed from one form to another.
2nd law of thermodynamics – The entropy of an isolated system not in equilibrium will tend to increase over time, approaching a maximum value at equilibrium.
3rd law of thermodynamics – As temperature approaches absolute zero, the entropy of a system approaches a constant minimum.
Fuses are present in many electrical devices. They are basically 🔥 fire-breakers 🔥
If there is a power surge, the fuse will break, preventing damage to the electrical devices. It will also prevent the incidence of 🔥 fire🔥 on/from such device.
Physics is one of the core sciences.
Physics is defined the scientific study of matter and the movement of matter through the space and time of the universe.
Understanding the basic and fundamental concepts of physics will help you better comprehend this subject. Below are some of the concepts: