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FAQs on Chapter 11 - Workand Energy - PowerPoint Presentation, Science, Class 9

1. What is work in the context of physics?
Ans. In physics, work is defined as a measure of energy transfer that occurs when an object is moved against an applied force. It is calculated by multiplying the force applied to an object and the distance over which the force is applied. The SI unit of work is joule (J).
2. How is work related to energy?
Ans. Work and energy are closely related concepts in physics. Work is the transfer of energy from one object to another, or from one form to another. When work is done on an object, energy is transferred to that object, resulting in a change in its energy. Similarly, when work is done by an object, energy is transferred away from that object.
3. What are the different forms of energy?
Ans. There are several different forms of energy, including: - Kinetic energy: the energy of motion - Potential energy: the energy stored in an object due to its position or condition - Mechanical energy: the sum of an object's kinetic and potential energy - Thermal energy: the energy associated with the motion of particles within a substance - Chemical energy: the energy stored in the bonds between atoms within molecules - Electrical energy: the energy associated with the flow of electric charges - Nuclear energy: the energy released during nuclear reactions - Light energy: the energy carried by electromagnetic waves
4. Can work be negative?
Ans. Yes, work can be negative. When a force is applied in the opposite direction to the displacement of an object, the work done by that force is negative. This means that energy is transferred away from the object, reducing its total energy. For example, if you push a box uphill, the work done by your force is negative because you are working against the force of gravity.
5. What is the relationship between work, force, and distance?
Ans. The relationship between work, force, and distance is given by the equation: work = force × distance × cos(θ), where θ is the angle between the force and the direction of displacement. This equation states that the work done on an object is equal to the force applied to the object multiplied by the distance over which the force is applied, and multiplied by the cosine of the angle between the force and the displacement.
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