 # Physical science grade 12 work energy and power notes pdf

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## Review of Work, Energy and Power

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In Grade 10, you saw that mechanical energy was conserved in the absence of non-conservative forces. It is important to know whether a force is an conservative force or an non-conservative force in the system, because this is related to whether the force can change an object's total mechanical energy when it does work on an object. For example, as an object falls in a gravitational field from a high elevation to a lower elevation, some of the object's potential energy is changed into kinetic energy. However, the sum of the kinetic and potential energies remain constant. We can investigate the effect of non-conservative forces on an object's total mechanical energy by rolling a ball along the floor from point A to point B.

If you're seeing this message, it means we're having trouble loading external resources on our website. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. Donate Login Sign up Search for courses, skills, and videos. Science Physics library Work and energy Work and energy. Introduction to work and energy.

Any force which conserves mechanical energy, as opposed to a nonconservative force. See statement of conservation of mechanical energy. Property of conservative forces which states that the work done on any path between two given points is the same. The energy of configuration of a conservative system. For formulae, see Definition of potential energy, gravitational potential energy, and Definition of potential energy given a position-dependent force. The sum of the kinetic and potential energy of a conservative system. Physical science , the systematic study of the inorganic world, as distinct from the study of the organic world, which is the province of biological science. Physical science is ordinarily thought of as consisting of four broad areas: astronomy , physics , chemistry , and the Earth sciences. Each of these is in turn divided into fields and subfields. This article discusses the historical development—with due attention to the scope, principal concerns, and methods—of the first three of these areas. The Earth sciences are discussed in a separate article. Physical science is the study of the inorganic world.

Skip to main content. Search form Search. Law of conservation of energy worksheet middle school. Law of conservation of energy worksheet middle school law of conservation of energy worksheet middle school Grade: High School Disclaimer and Safety Precautions Education. Law of conservation of energy is a false idea. Page 0. PHYSICAL SCIENCES. GRADE PHYSICS. NORTHERN CAPE DEPARTMENT OF Lesson 7 -: Revision exercises on work-energy and power.

### Review of Work, Energy and Power

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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.

In physics , energy is the quantitative property that must be transferred to an object in order to perform work on, or to heat , the object. The SI unit of energy is the joule , which is the energy transferred to an object by the work of moving it a distance of 1 metre against a force of 1 newton. Common forms of energy include the kinetic energy of a moving object, the potential energy stored by an object's position in a force field gravitational , electric or magnetic , the elastic energy stored by stretching solid objects, the chemical energy released when a fuel burns , the radiant energy carried by light, and the thermal energy due to an object's temperature. Mass and energy are closely related. Hello Codeforces!

• #### Felicia G. 08.04.2021 at 16:22

Like Like.

• #### Nantorefpe 11.04.2021 at 00:04

We perform various types of work in our daily life.

• #### Hersokusic 11.04.2021 at 14:38

Examples. Practice Questions on Work, Energy and Power. 16 For the Physical Sciences (and Mathematics) papers, this Read your notes / textbook, write summaries, calculate answers, and memorise energy (Grade 10​).

• #### Epcommehand 13.04.2021 at 11:45

Grade 12 PHYSICAL SCIENCES Term 2. TOPIC: Whatever LESSON: whatever. TOPIC 5: Work, energy and power. GRADE WORKSHEET. 1. The 60 N force​.

• #### Odette B. 14.04.2021 at 13:49

The words “work” and “power” must be clearly defined as science concepts and it must be further clarified to the learners that these words do not carry the same.

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