Topics in PhysicsDerived Units: Similarities and Differences with Fundamental Units Gravity: Interesting facts on Gravity Relative 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 Quantities and Units in Physics
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.
Motion happens to be one of the interesting topics in physics.
Generally, an object is said to be in motion whenever it moves. In fact, we live in a universe where everything moves, although at a different rate. For instance:
In physics, motion refers to a change in the position of an object with reference to time.
Although we may sometimes sit or stand in a fixed position, that doesn’t mean motion isn’t taking place. The fact that the earth is rotating implies that we are indirectly moving along with it.
We can thus say that motion can be relative to some frame of reference.
In the above instance, the earth (constantly rotating along its axis) is our frame of reference and everything present on earth is in motion with regard to earth as a frame of reference.
Another instance can be attributed to someone sitting inside a moving bus. The person will appear to be static (not moving). Based on the fact that the bus is in motion (moving), we can conclude that the motion of the person sitting inside the bus is relative to the bus.
Note: Force is responsible for the motion/movements present in the universe.
For an object to move, a force must act upon it. Consider the instance below:
If we keep a pin in a vacuum and it’s left untouched, the pin will remain in that position "forever" unless it is acted upon by a force. This force could be in the form of an applied air or a deliberate touch by humans.
In order to get a better understanding of motion, it is important we know how the following terms work since they all involved in motion. The terms are:
Speed is simply the rate of motion since it is a measure of how fast or slow an object is moving.
The dimensions associated with speed are distance and time.
If one covers a distance of 10000 meters in 50 seconds and another covers the same distance in 5000 seconds, we can conclude that the first person has a faster speed than the second person because he covered the same distance at a lesser time.
Speed is defined as distance travelled per unit of time.
Speed can also be defined as the rate of change of distance.
Speed = distance/Time
Note: Distance is the total length of path traveled from one point to another. It is measured in meters (m).
Time is a duration or period during which things happen. It is measured in seconds(s).
Speed is a scalar quantity since it is has only magnitude and no direction.
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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: