The three original “hard” sciences—those that rely on experiments, testable predictions and hypotheses, mathematics, and modelling as opposed to the “soft” sciences, which rely more on qualitative data and testing less frequently—are chemistry, biology, and physics.
Understanding the principles and regulations that govern the physical world is made possible by physics, which is the study of matter, energy, and their interactions. Everyone uses fundamental physics ideas to get by in daily life, even if not every student will go on to study physics in depth as they get older.
What is Physics?
Our current sciences all have names derived from Greek roots. The word for physics is “physik,” which means “knowledge of nature.” Therefore, studying physics implies examining nature at its most fundamental level, including matter, motion, different types of energy, time, and space, as well as their effects and interactions.
Similar to how chemistry has had a significant impact on environmental sciences, it now crosses over with many other fields of study. It also supports the physical sciences by giving them the theoretical foundation on which to build their own hypotheses and fundamental theoretical models.
Importance of Physics
● Physics is a key component of the technological infrastructure and provides the qualified workers needed to benefit from scientific advances.
● Since chemists, engineers, computer scientists, and practitioners of other sciences must understand physics concepts, it is crucial from the standpoint of education.
● It clarifies the ideas and enables us to comprehend the different disciplines, including cosmology, earth, chemistry, agricultural, and environmental science.
● It gives us a fundamental understanding of how we live, which is essential for creating new tools and methods for medical applications.
List of Important Physics for Students
7 Easy Ways To Learn Physics
The foundation of science as a discipline is physics. If you succeed in this topic, you’re in for some thrilling moments as you reach higher standards of academic success every day!
The 7 Mantras Are As Follows:
1. It Is Important To Master the Fundamentals
Mastering the fundamental theories is one of the simplest methods to understand physics. Understanding the fundamental laws will aid you in later, more sophisticated stages, when tackling complicated situations. Create a mind map using graphics that provides a summary of all the concepts and connects them to the challenging issues.
2. Simplifying Is a Key Rule
Physics is a challenging subject to learn by heart, but after being simplified, it becomes one of the most engaging and high-scoring courses. There will be moments when you will encounter challenging issues; in these situations, remember to break the difficulty down into simpler, more manageable parts.
3. Create Flashcards
As you read through different topics, note down any new words or concepts you come across, as well as any guiding principles or rules, to use as the basis for your flashcards. These flashcards can be used for rapid review, and you can continue reviewing them whenever you have time. These flashcards are also useful for times when you’re having trouble solving a problem.
4. Make Math Your Strength
Sir Albert Einstein expressed it best when he said, “Mathematics is the building block of Physics.” You need to establish a very solid mathematical foundation if you want to master physics.
5. A Good Tutor Can Really Help!
You need a skilled physics teacher if you want to succeed in the subject and even master it. He or she will assist you in making the concepts simpler and help you comprehend them clearly. A bad teacher will cause more harm than good.
6. Use Diagrammatic Representations To Learn The Topics
Creating drawings is one of the finest ways to learn physics concepts and principles. The use of diagrams and figures makes it simple to master all the relevant physics theorems and ensure that you have a firm grasp of the units of measurement.
7. Wake Up in the Morning and Revise
It is well said by the experts that children can learn tough things efficiently in the morning with a fresh mind. So, practicing the formulas and revising the theories of physics will make a good impact to a child’s mind if it is done in the morning before going to the best cbse school in pune.
Important Basic Physics Formulas with Examples
1. Angular Acceleration
α=Δω/Δt
Q. A wheel rotating at 10 rad/s2 is imparted with a constant angular acceleration of 4 rad/s2 for 5 seconds. The number of rotations made by the wheel in this 5 s interval is:
Ans – 50/π
2. Distance
Distance (d) = Speed (s) * Time (t)
Q. Suppose a dog runs from one end of the street to another end of the street and the street is 80.0 meters across. Moreover, it takes 16.0 seconds to cross to reach the end of the street. Now, calculate the speed of the dog?
Ans – Speed = distance/time
Speed = dt
Speed = 80.0m/16.0s = 5.0 m/sec
3. Potential Energy
PE= mgh
● Where PE is Potential energy
● m is the mass of the body
● h is the height at which the body is placed above the ground
● g is the acceleration due to gravity
Q. State the changes in energy types when a ball is thrown upward.
Ans – When a ball is at ground level, the potential energy is zero. When it is thrown upward, it moves due to kinetic energy present in the ball by virtue of its motion. As it reaches its maximum height, the kinetic energy is converted to potential energy. As the ball comes down, the potential energy is again converted to kinetic energy.
4. Gravitational Force
g=G(Mm/r^2) =9.8m/s2
Q. What is the SI unit of gravity?
Ans – For SI units, this acceleration is measured in meters per second (in symbols, m/s2) or equally in newtons per kilogram (N / kg). Minimum “medium” surface area, known as normal gravitational force, by definition, is 9.80665 m/s2.
5. Surface Tension
T=F/L
where,
● F is the force per unit length
● L is the length in which force is act
● T is the surface tension
Q. Why are water drops spherical?
Ans – Raindrops are spherical in shape due to the presence of cohesive forces between liquid molecules and the surface tension of the liquid.
6. Average Acceleration
Average acceleration = V1+V2+V3+…+Vn/T1+T2+T3+…Tn, where V is the velocity and T is the time.
Q. If an object accelerates from 20 m/s to 80 m/s in 3 seconds, Find the average acceleration for the object.
Ans – 13 m/s^2
7. Projectile Motion
H = u sinθ/g (u is initial velocity and g is gravity’s acceleration)
Q. Give one instance where you can visualize projectile motion in real life?
Ans – Sneezing
Sneezing is our body’s natural reflex to eject foreign material from our mouth and nose. The particles and droplets that come out of your mouth travel in a projectile manner as they land on nearby objects and surfaces when you sneeze.
8. Power
P = W/T (W – work done by an object, T – total time taken)
Q. Define 1 watt of power.
Ans – Power is said to be 1 watt when 1 Joule work is done in 1 second.
9. Final Velocity
v = u + at
Where, u = initial velocity
v = final velocity
a = acceleration
t = time
Q. What is the Unit of Velocity?
Ans – Velocity is a physical vector quantity; both magnitude and direction are needed to define it. It is measured in the SI (metric system) as meters per second (m/s) or as the SI base unit of (m⋅s-1). Velocity is defined as the distance travelled by the body during a unit somewhere. The SI unit velocity is m/s.
10. Coulomb’s Law
F=Ke (q1q2/r^2)
Ke is the Coulomb’s law constant, q1 and q2 are the charges and r is the distance between the two charges, F is the force.
Q. When the Two-Point Charges, q1 = +9 μC, and q2 = 4 μC, are Separated with a Distance r = 12 cm, Calculate the Magnitude of the Electric Force.
Ans – 22.475 N
11. Friction Force
Friction = (coefficient of friction) *(normal force)
Ff = μη
Q. Assume a large block of ice is being pulled across a frozen lake. Furthermore, the mass of the block of ice is 250 kg. Also, the coefficient of friction between the two surfaces is small μk = 0.05. So, find the force of friction that acts on the block of ice?
Ans – 122.5 N
12. Wave Speed
Speed of the wave = wavelength * frequency
v=νλ
Q. What is the speed of a wave that has a wavelength of 0.5 m and a frequency of 600 Hz?
Ans – 300 m/s
13. Linear momentum
Linear momentum = mass * velocity
P = m * v
Q. Determine the linear momentum of a moving body whose mass is 10 kg and speed is 30ms^−1
Ans – 300 kgms^−1
14. Force
Force = mass * acceleration
F = ma
Q. A constant force acting on a body of mass 3.0 kg changes its speed from 2.0 m/s to 3.5m/s in 25 s. The direction of the motion of the body does not changes. What is the magnitude and what is the direction of the force?
Ans – F = 0.18 N. Since the application of the force does not change the direction of the body, the net force acting on the body goes in the direction of its motion.
15. Work Done
Work (W) = force (F) * Displacement (d)
Q. Compute the work done if 10 N of force acts on the body showing the displacement of 2m in the direction of the force.
Ans – 20 joules.
Conclusion
Physics is a branch of natural science that focuses on the study of matter, including its fundamental components, motion, and behaviour in both space and time, as well as the associated concepts of energy and force. By reading this blog, you can well understand the importance of physics in our day-to-day life.
If you are in high school in pune then the above list of physics formulas will always be helpful for you in the long run.
