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 rate of change of momentum is proportional to the applied force and will take place in the direction of that force.
The above statement is attributed to _____.
A. Albert Einstein
B. Isaac Newton
C. Galileo Galilei
D. Neils Bohr
E. Ernest Rutherford
F. Marie Curie
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 _____.
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Force is a vector quantity because it has both magnitude and direction.
By definition, any form of push or pull acting on an object is termed force.
You probably may have heard a saying that goes thus:
The above statement is true because the earth has a force acting on it. This force, (called the gravitational force of the earth) acts by pulling all things towards the earth.
In order to move away from the earth, there must be another constant force greater than the gravitational force or force of gravity.
Note: Aeroplanes and Jets move away (fly) from the earth and remains in the sky because the constantly applied force in them is greater that the earth's gravitational force.
In another instance, when you jump, you apply a force; but since this applied force isn’t constant, the force of gravity present on earth eventually bring you back to earth's suface.
Note: Force as a quantity is measured in Newtons (N). This is in honor of Sir Isaac Newton for the great work he has done.
Force can be balanced or unbalanced. To summarize this:
An apple hanging on a tree has a balanced force.
An apple falling from a tree has an unbalanced force.
Sir Isaac Newton presented the laws of motion (which will later be accredited to his name) in 1968. These "motion laws" of Newton explains the relationship between the forces acting on a body and the motion of the body.
Recall that motion refers to a change in the position of an object with reference to time.
As an instance, a pen resting on a table will continue to remain on the table unless it is pushed or pulled by something. This push or pull with the tendency of making the pen move away from its exact position is known as force.
Note: Force exists as a result of an interaction between two objects. From the above instance, if nothing interacted with the pen on the table, then the pen will continually remain on the table.
If there is no interaction between objects, force will never be experienced.
With the above explanation on force and motion, we can now understand more easily the Newton's laws of Motion.
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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: