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Some people are lucky enough to have a natural gift for physics. However, most of us have to study hard to get good grades in this subject. By learning important foundational skills and practicing a lot , anyone can be good at physics. In fact, good grades are only one part, but more importantly, knowledge of physics helps us better understand the mysterious forces that govern the way the world works.
Steps
Understand basic physics concepts
- Gravity acceleration: 9.81 m/s ^{2}
- Speed of light: 3 × 10 ^{8} m/s
- Ideal Gas Constant: 8.32 J/(mp × Kelvin)
- Avogadro’s constant: 6.02 × 10 ^{23} /mp
- Planck constant: 6.63 × 10 ^{-34} J × s
- Speed = Distance/Time of movement (dx/dt)
- Acceleration = Velocity change / Velocity change time
- Current Velocity = Initial Velocity + (Acceleration × time)
- Force = Mass × acceleration
- Kinetic Energy = (1/2) Mass × Velocity ^{2}
- Work = Displacement × force
- Power = Work/Time
- Momentum = Mass × Velocity
- For example, consider the following simple equation: Acceleration = Change of Velocity/Time to Change of Velocity = Delta(v)/Delta(t). Acceleration is the force that causes the velocity of an object to change. If an object has an initial velocity of v _{0} at time t _{0} and a final velocity of v at time t, we can say that the object has accelerated from v _{0} to v. Acceleration is not an instantaneous quantity — no matter how quickly things happen, there will be a time difference from when the object starts moving at its initial velocity to when it reaches its final velocity. So a = (v – v _{0} /t – t _{0} ) = Delta(v)/Delta(t).
- Pre-algebra and algebra (for basic equations and “find unknown quantities”) exercises
- Trigonometry (for force diagrams, rotation problems, and inclined systems)
- Geometry (for exercises on areas, volumes, etc.)
- Pre-calculus and calculus (to calculate derivatives and integrals of physical equations — advanced physics topic)
- Linear algebra (for calculations containing vectors – usually advanced physics topics)
Use the strategy of focusing on getting points
- For example, suppose we need to find the acceleration of a car when its velocity changes after a time of 2 seconds. If the car weighs 1,000 kg, starts running at 9 m/s and the final speed is 22 m/s, we can say v _{0} = 9 m/s, v = 22 m/s, m = 1,000 kg, t = 2 s. As mentioned, the acceleration equation is a = (v – v _{0} /t – t _{0} ). Note that this equation has no mass, so we can ignore the information that the mass of the car is 1,000 kg.
- So the equation is solved like this: a = (v – v _{0} /t – t _{0} ) = ((22 – 9)/(2 – 0)) = (13/2) = 6.5 m/s ^{2}
- Weight: Gram or kilogram
- Force: Newton
- Velocity: meters/second (sometimes kilometers/hour)
- Acceleration: meters/second ^{2}
- Energy/Work: Joul or kilojoul
- Power: Watt
- For example, suppose the exercise asks you to find the acceleration of a 5 kg block of wood sliding on a flat floor if it is pushed with a force of 50 newtons. Since F = m × a, it seems that you can easily solve the equation 50 = 5 × a to find the answer. However, in practice, the force of friction will counteract the motion of the object and greatly reduce the repulsive force acting on the object. Neglecting friction will result in the block accelerating slightly faster than it actually is.
- Although re-solving is a way of checking math operations, you should also intuitively assess the relationship between the exercise and reality to check your answers. For example, if you were to find the momentum (mass × velocity) of an object moving forward, the answer would not be negative because mass is positive and velocity is negative only if the object is moving. move in the “negative” direction (i.e. the opposite of the “forward” direction in the reference coordinate). So if the answer is a negative number, you probably did something wrong during the solution.
Focus on studying in physics class
- If you have questions lingering in your mind after class, talk to your teacher. Try to ask questions as specific as possible — this shows you’ve listened to the teacher. If the teacher isn’t busy, he or she may schedule an appointment to re-read the lesson and help you understand the problem.
- You can ask if your teacher will allow you to record the lecture so you can listen to it again. Thanks to that, you can also ask the teacher to clarify if something is difficult to understand after listening to the lecture again.
- If you’re not satisfied with your physics score, don’t just practice with the homework given by your teacher. Try to solve more difficult problems that you wouldn’t normally come across — it could be exercises in textbooks that aren’t given at home, free exercises on the internet, or in physics workbooks ( sold in bookstores).
- Teacher (see you after class)
- Friends (group study or homework together)
- Tutor (self-employed or provided by the school according to the training program)
- Resources provided by third parties (like physics workbooks, websites like Khan Academy, etc.)
Advice
- Focus on concepts . It is always helpful to “visualize” what the teacher is teaching.
- Develop math skills . Advanced physics is mainly applied mathematics, especially calculus. You must know how to integrate and solve equations by substitution or partial solution.
- When solving exercises, pay attention to every detail . Don’t forget to calculate the friction force or forget to calculate the moment of inertia about the axis.
- Learn the derivative.
- Discuss assignments and learning content with friends in the class. This benefits both you and them.
wikiHow is a “wiki” site, which means that many of the articles here are written by multiple authors. To create this article, 14 people, some of whom are anonymous, have edited and improved the article over time.
This article has been viewed 55,501 times.
Some people are lucky enough to have a natural gift for physics. However, most of us have to study hard to get good grades in this subject. By learning important foundational skills and practicing a lot , anyone can be good at physics. In fact, good grades are only one part, but more importantly, knowledge of physics helps us better understand the mysterious forces that govern the way the world works.
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