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.
Heat is a form of energy. It cannot be lost according to the First Law of Thermodynamics; rather it will be transferred.
The First and Second Laws of thermodynamics are stated below:
Energy can neither be created nor destroyed but can be transformed or converted from one form to another.
1 st Law of thermodynamics
In the course of energy transfer, some energy is lost in the form of heat to the surroundings.
2 nd Law of thermodynamics
Heat transfer indicates how heat flows between two systems of varying temperature.
Note: Heat will always be transferred from the region of higher temperature to the region of lower temperature.
To better understand how the processes of heat transfer are achieved, it will be great if we first understood how the particles of matter move.
Below is a quick explanation of the particulate nature of matter:
Matter is composed of particles which can either be:
1. Tightly packed together (as seen in Solids).
2. Loosely packed together (as seen in Liquids).
3. Completely separated (as seen in Gases).
With regards to solids (which have their constituent particles closely packed together), its particles will vibrate in a fixed position.
Please read on the Particles of Solids and their Characteristics here.
With regards to liquids (which have their constituent particles loosely packed together), its particles will rotate from one point to another.
Please read on the Particles of Liquids and their Characteristics here.
With regards to gases, its particles will translate (exhibit a random motion) from one point to another throughout its container.
Please read on the Particles of Gases and their Characteristics here.
Note: The movement of the particles of matter is a function of the kinetic energy present in them. (Think of kinetic energy as energy in motion).
From the above explanations, we can therefore conclude that gaseous particles have got the highest kinetic energy while solid particles have got the least kinetic energy.
An increase in particles' vibrational, rotational or translational motion will imply an increase in temperature while a decrease in the particles motion (vibrational, rotational and translational) will mean a decrease in temperature.
We can thus define temperature as the measure of the average kinetic energy possessed by the particles of matter.
From the above explanations on the movement of particles, we can now properly explain the transfer of heat.
Heat can be transferred through:
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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: