Good day, students!
In today’s tutorial, we’re reviewing some important Physics questions that are likely to appear in JAMB 2026. Each question is broken down step-by-step to help you understand the concepts and formulas used — not just memorize answers.
Let’s jump right in!
You can watch the full class in the video below:
Question 1: Calculating Stress on a Loaded Wire
Question:
A wire with diameter y meters is loaded with a weight of y² newtons. What is the stress experienced by the wire?
Physics Concept:
Stress is defined as: Stress=ForceArea\text{Stress} = \frac{\text{Force}}{\text{Area}}Stress=AreaForce
Step-by-Step Solution
Given:
- Force (weight) = y2y^2y2
- Diameter = yyy
- Radius = y2\frac{y}{2}2y
- Area = πr2=π(y2)2=πy24\pi r^2 = \pi \left(\frac{y}{2}\right)^2 = \frac{\pi y^2}{4}πr2=π(2y)2=4πy2
Now calculate stress: Stress=y2πy24=y2×4πy2\text{Stress} = \frac{y^2}{\frac{\pi y^2}{4}} = \frac{y^2 \times 4}{\pi y^2}Stress=4πy2y2=πy2y2×4
Cancel out y2y^2y2 on top and bottom: Stress=4π\text{Stress} = \frac{4}{\pi}Stress=π4
Final Answer: 4π N/m2\boxed{4\pi \, \text{N/m}^2}4πN/m2
Correct Option: C
Question 2: When Is Work Actually Done?
Question:
Under which of the following conditions is work done?
Options:
A) A man supports a heavy load on his head with his hands
B) A woman holds a pot of water
C) A boy climbs onto a table
D) A man pushes against a wall
Physics Explanation:
In physics, work is done when a force causes displacement in the direction of the force.
- A and B involve holding something without movement → No work done
- D involves pushing with no displacement → No work done
- C involves climbing (vertical movement against gravity) → Work is done
Correct Answer: C – A boy climbs onto a table
JAMB Physics Insight
These two questions combine Elasticity and Mechanics — both key JAMB Physics syllabus topics. Here’s why they matter:
- Elasticity (Stress and Strain): Teaches how materials behave under force
- Mechanics (Work, Energy): Core topic that connects everyday actions to Physics formulas
Watch more educational videos and past questions: https://youtube.com/@allcbts
Exam Tip for JAMB 2026 Physics
Always remember: In Physics, conceptual understanding beats memorization.
You should be able to:
- Identify which formulas apply
- Know when to cancel units or terms
- Recognize where work is or isn’t done
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Target Keywords:
JAMB 2026 Physics, JAMB Physics elasticity, stress formula physics, when is work done in physics, likely Jamb physics questions, physics N/m² question JAMB