DIGITAL LESSONS > O LEVEL WORK, ENERGY, POWER
Work, Energy, Power
Explore fundamental concepts like kinetic energy, gravitational potential energy, work done and more. Preview select video lessons, summary notes, and practices. Our aim is to provide students with a comprehensive collection of revision materials to enhance their understanding of WEP.
👨🏻🏫2 Physical Live Lessons * 2 Hours/Week
💻8 Conceptual Videos & 11 Example Question Videos
Conceptual Videos
Summary Notes
WEP (Summary Notes Download)
Mastery Practices
🟩Easy
A coconut of mass 600 g falls from a height of 30 m. Ignoring air resistance, what is the speed of the coconut before it hits the ground?
Video Explanation
Answer
🟨Medium
A ball of mass 40.0 g is fired from a source horizontally at a speed of 125 m/s. The ball collides with a stationary object X of mass 500 g and is stuck with it. Both the ball and object X now move together at a horizontal speed of 10 m/s immediately after the collision. They both swing upwards to a vertical height of h from the original position before coming to a stop.
a) What is the kinetic energy o the ball before it hits object X?
b) What is the kinetic energy of the ball and object X after both collide and are stuck together?
c) Using the kinetic energy in (b) and the fact that air resistance is negligible, calculate the height h.
Answer
🟨Medium
A box of mass 0.5 kg is pushed along a slope from P to Q by a force F of 12 N as shown in the diagram below. Take g as 10 N/kg.
a) Calculate the work done by force F to move the box from P to Q.
b) Calculate the potential energy of the box at the top of the slope.
c) The work done by force F is not equal to the potential energy gained by the object at the top of the slope. Explain the discrepancy.
d) What is the work done against friction from P to Q?
Video Explanation
Answer
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