Welcome to AllCBTs JUPEB Physics tutorial! In today’s class, we’ll tackle some of the top JUPEB Physics past questions — covering key concepts such as unit vectors, work-energy theorem, and more. These topics often appear in exams and understanding them gives you a competitive edge.
Let’s get started with the questions and answers.
Question 1 (AI): Define Unit Vector
A unit vector is a vector that has a magnitude of exactly one and indicates only the direction of a vector quantity.
In notation, we often use a “hat” ( ˆ ) on top of the vector symbol. For example:
- If A is a vector, then  (A-hat) represents the unit vector in the direction of A.
Unit vectors are essential in expressing directions clearly, especially in vector equations and components.
Question 1 (AII): State the Work-Energy Theorem
The Work-Energy Theorem states:
“The net work done on a particle by all forces acting on it is equal to the change in the particle’s kinetic energy.”
Explanation:
This means that if a force moves an object and does work on it, that work translates into a change in the object’s motion (its kinetic energy). It’s a fundamental concept in mechanics and helps bridge the ideas of force and motion.
Watch more educational videos and past questions: https://youtube.com/@allcbts
Why These Concepts Matter in JUPEB Physics
Understanding unit vectors helps you deal with quantities that have direction, especially in projectile motion, circular motion, and Newtonian mechanics. Meanwhile, the work-energy theorem lays the groundwork for energy conservation — a principle that appears frequently in JUPEB and university-level physics.
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