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1. What is work in terms of physics?
Ans. In terms of physics, work is defined as the product of force and displacement in the direction of force. It is a scalar quantity and its SI unit is joule (J).
2. What is the difference between work and energy?
Ans. Work and energy are closely related but they have different meanings. Work is the transfer of energy from one object to another whereas energy is the ability to do work. Work is a scalar quantity whereas energy is a vector quantity.
3. What is the principle of conservation of energy?
Ans. The principle of conservation of energy states that energy cannot be created or destroyed, it can only be transformed from one form to another. In other words, the total energy of a system remains constant unless it is acted upon by an external force.
4. What is the formula for potential energy and kinetic energy?
Ans. The formula for potential energy is PE = mgh, where m is the mass of an object, g is the acceleration due to gravity and h is the height of the object above the ground. The formula for kinetic energy is KE = 0.5mv^2, where m is the mass of an object and v is its velocity.
5. What are some real-life examples of work and energy?
Ans. Some real-life examples of work and energy include lifting a weight, pushing a car, running, throwing a ball, and turning on a light switch. In all these examples, work is done and energy is transferred from one object to another.
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