File Name: work energy and power in physics .zip
Physics for Computer Science Students pp Cite as. The terms work, energy, and power are common words in English. In physics we require precise definitions so that these terms can be formulated mathematically.
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Mr Trask's Physics. Search this site. Unit 0 - Introduction. Unit 1 - Kinematics in 1D. Unit 2 - Kinematics in 2D.
Power is the rate at which work is done. Mathematically, it is computed using the following equation. The standard metric unit of power is the Watt. As is implied by the equation for power, a unit of power is equivalent to a unit of work divided by a unit of time. For historical reasons, the horsepower is occasionally used to describe the power delivered by a machine. One horsepower is equivalent to approximately Watts. Most machines are designed and built to do work on objects.
5. Work Energy Power. 9. Summary: Work, Energy And Power. 9. Summary of concepts on work. ENERGY. POWER. 6. CHECK YOUR.
The principle of work and kinetic energy also known as the work-energy theorem states that the work done by the sum of all forces acting on a particle equals the change in the kinetic energy of the particle. This definition can be extended to rigid bodies by defining the work of the torque and rotational kinetic energy. Kinetic Energy : A force does work on the block. The kinetic energy of the block increases as a result by the amount of work. This relationship is generalized in the work-energy theorem. For the sake of simplicity, we will consider the case in which the resultant force F is constant in both magnitude and direction and is parallel to the velocity of the particle. The particle is moving with constant acceleration a along a straight line.
A farmer ploughing the field, a construction worker carrying bricks, a student studying for a competitive examination, an artist painting a beautiful landscape, all are said to be working. Somebody who has the capacity to work for hours a day is said to have large stamina or energy. Being aware of the topics and sub-topics of this chapter will help you in preparing well for the exam.
Question 6. The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative: a Work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket, b Work done by gravitational force in the above case, c Work done by friction on a body sliding down an inclined plane, d Work done by an applied force on a body moving on a rough horizontal plane with uniform velocity, e Work done by the resistive force of air on a vibrating pendulum in bringing it to rest. Compute the a Work done by the applied force in 10 s b Work done by friction in 10 s c Work done by the net force on the body in 10 s d Change in kinetic energy of the body in 10 s and interpret your results. Given figures are examples of some potential energy functions in one dimension. The total energy of the particle is indicated by a cross on the ordinate axis.
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