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Physics Form 3 Curriculum: Questions and Answers PDF Download


Physics Form 3 Questions and Answers PDF Download




Are you looking for a reliable source of Physics Form 3 questions and answers PDF download? If yes, then you have come to the right place. In this article, we will provide you with everything you need to know about Physics Form 3, including the topics covered, the exam tips, and the best way to download the PDF files for free.


Introduction




Physics is a fascinating subject that explores the nature of matter, energy, and their interactions. It helps us understand the world around us and the laws that govern it. Physics also has many applications in various fields such as engineering, medicine, astronomy, and technology.




physics form 3 questions and answers pdf download


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Physics Form 3 is a part of the secondary school curriculum in Kenya that covers the basic principles and concepts of physics at an intermediate level. It prepares students for the national examinations at the end of Form 4, as well as for further studies in physics or related subjects.


Why study Physics Form 3?




There are many reasons why you should study Physics Form 3, such as:


  • It enhances your logical thinking and problem-solving skills.



  • It develops your curiosity and creativity.



  • It broadens your knowledge and perspective.



  • It opens up many opportunities for your future career or education.



What topics are covered in Physics Form 3?




The syllabus for Physics Form 3 consists of nine topics, namely:


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  • Applications of Vectors



  • Friction



  • Light



  • Optical Instruments



  • Thermal Expansion



  • Transfer of Thermal Energy



  • Measurement of Thermal Energy



  • Vapour and Humidity



  • Current Electricity II



Each topic covers the basic theory, the practical skills, and the relevant examples of physics in everyday life. You will also learn how to perform experiments, make observations, analyze data, and draw conclusions using physics concepts.


How to download Physics Form 3 questions and answers PDF?




If you want to download Physics Form 3 questions and answers PDF for free, you can follow these simple steps:


  • Visit the website , which provides a comprehensive collection of physics questions and answers for all topics for form 1, form 2, form 3, and form 4.



  • Select the topic that you want to download from the list provided.



  • Click on the link that says "Download" or "View" to access the PDF file.



  • Save the file to your device or print it out for your convenience.



Physics Form 3 Topics and Questions




Applications of Vectors




Definition and examples of vectors




A vector is a quantity that has both magnitude (size) and direction. Examples of vectors are displacement, velocity, acceleration, force, momentum, weight, etc. A vector can be represented by an arrow that shows its direction and length (proportional to its magnitude).</p Addition and subtraction of vectors




To add or subtract vectors, we can use the triangle or parallelogram method. The triangle method involves placing the vectors head to tail and drawing the resultant vector from the tail of the first vector to the head of the last vector. The parallelogram method involves placing the vectors tail to tail and drawing the resultant vector from the common tail to the opposite corner of the parallelogram formed by the vectors.


Resolution and composition of vectors




To resolve a vector into two components, we can use the trigonometric ratios to find the magnitude and direction of each component. The components are usually perpendicular to each other and lie along the horizontal and vertical axes. To compose a vector from two components, we can use the Pythagoras theorem and the inverse trigonometric ratios to find the magnitude and direction of the resultant vector.


Sample questions and answers on vectors




Here are some sample questions and answers on vectors that you can practice with:



Question


Answer


A plane flies 200 km east and then 150 km north. What is its displacement from its starting point?


We can use the triangle method to find the displacement vector. The magnitude of the displacement is given by:


$$\\sqrt(200)^2 + (150)^2 = 250 \\text km$$


The direction of the displacement is given by:


$$\\tan^-1\\left(\\frac150200\\right) = 36.9^\\circ \\text north of east$$


Therefore, the displacement is 250 km at 36.9 north of east.


A force of 50 N acts at an angle of 30 to the horizontal. What are its horizontal and vertical components?


We can use the trigonometric ratios to find the components of the force. The horizontal component is given by:


$$50 \\cos 30^\\circ = 43.3 \\text N$$


The vertical component is given by:


$$50 \\sin 30^\\circ = 25 \\text N$$


Therefore, the horizontal component is 43.3 N and the vertical component is 25 N.


Friction




Definition and types of friction




Friction is a force that opposes the relative motion or tendency to move of two surfaces in contact. There are three main types of friction, namely:



  • Static friction: This is the friction that acts on a stationary object when a force tries to move it. It increases as the applied force increases until it reaches a maximum value, after which the object starts to move.



  • Kinetic friction: This is the friction that acts on a moving object when a force tries to change its speed or direction. It is usually less than static friction and depends on the nature and speed of the surfaces.



  • Fluid friction: This is the friction that acts on an object when it moves through a fluid (liquid or gas). It depends on the viscosity, density, and shape of the fluid and the object.



Factors affecting friction




The magnitude of friction depends on two main factors, namely:



  • The normal force: This is the force that acts perpendicular to the surfaces in contact. It is usually equal to the weight of the object or the reaction force from a support. The greater the normal force, the greater the friction.



  • The coefficient of friction: This is a constant that depends on the nature and roughness of the surfaces in contact. It has no units and varies from 0 (no friction) to 1 (maximum friction). The greater the coefficient of friction, the greater the friction.



The formula for friction is given by:


$$F = \\mu N$$ where F is the frictional force, µ is the coefficient of friction, and N is the normal force. Advantages and disadvantages of friction




Friction has both advantages and disadvantages, depending on the situation. Some of the advantages of friction are:



  • It enables us to walk, run, and grip objects without slipping.



  • It helps us to stop, slow down, or change direction of moving objects using brakes, tyres, or gears.



It produces heat and sparks that can be


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