DIGITAL LESSONSΒ > 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.

π¨π»βπ«2 Physical Live Lessons * 2 Hours/Week

π»8 Conceptual Videos & 11 Example Question Videos

##### Conceptual Videos

##### Summary Notes

WEP (Summary Notes Download)

# Mastery Practices

**π©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

**π¨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

π¨**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.

*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.

*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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