What is Work ?

Work is the transfer of energy when a force is applied to move an object over a distance. It is calculated by multiplying the force applied in the direction of displacement by the distance. Work can be positive, negative, or zero depending on the alignment of force and displacement. It relates to the transfer or transformation of energy and is measured in joules. The work-energy theorem states that work done on an object causes a change in its kinetic energy.

What is Energy ?

Energy is the capacity to do work or cause changes in a system. It exists in various forms such as kinetic, potential, thermal, and more. Energy can be transferred and transformed but cannot be created or destroyed (conservation of energy). The unit of energy is the joule (J). Understanding energy is crucial for understanding the behavior of physical systems and has applications in multiple fields.

What is Power ?

Power measures the rate at which work is done or energy is transferred. It is calculated by dividing work by time. The unit of power is the watt (W). Higher power signifies faster energy transfer or work done. Power is important in evaluating efficiency and understanding the performance of various systems and machines.

What is Collision ?

Collisions involve objects coming into contact and exerting forces on each other. They can be elastic (conserving kinetic energy and momentum) or inelastic (resulting in some energy loss). Conservation of momentum and energy govern collisions. Impulse is the change in momentum during a collision. Studying collisions helps understand real-world scenarios and has applications in physics and engineering. 

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Table of Content

1. Introduction

2. Work done by a constant force

3. Nature of work done

4. Work done by a variable force

5. Dimension and units of work

6. Work done calculation by force displacement graph

7. Work done in conservative and non-conservative field

8. Work depends on frame of reference

9. Energy

10. Kinetic energy

12. Potential energy

13. Elastic potential energy

14. Electrical potential energy

15. Gravitational potential energy

16. Work done in pulling the chain against gravity

17. Velocity of chain while living table

18. Law of conservation of energy

19. Power

20. Position and velocity of an auto-mobile with respect to time

21. Collision

22. Perfectly elastic head-on collision

23. Perfectly elastic oblique collision

24. Head-on inelastic collision

25. Rebounding of ball after collision with ground

26. Perfectly inelastic collision

27. Collision between bullet and vertically suspended block