Science Single Award - 4SS0 PearsonEdexcel

Work And Power

Muhtasari

Two students carry identical boxes of books up the same staircase. One runs and arrives out of breath in 8 seconds; the other strolls up in 40. They have done exactly the same amount of work, and they are nowhere near equally powerful. That distinction is the heart of this topic.

Here you will meet the equation for work done, the two energy equations that go with it for height and for speed, the conservation rule that ties all three together, and the definition of power that separates how much energy from how quickly.

Malengo

Know and use the relationship between work done, force and distance moved in the direction of the force: W = F x d
Know that work done is equal to energy transferred
Know and use the relationship between gravitational potential energy, mass, gravitational field strength and height: GPE = m x g x h
Know and use the relationship: kinetic energy = 0.5 x mass x speed squared
Understand how conservation of energy produces a link between gravitational potential energy, kinetic energy and work
Describe power as the rate of transfer of energy or the rate of doing work
Use the relationship between power, work done (energy transferred) and time taken: P = W/t

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Maelezo ya Somo

In everyday speech, holding a heavy suitcase still at arm's length is hard work. In physics it is no work at all, because nothing moves. The physics definition is narrower than the everyday one and much more useful, because it connects directly to energy: whenever work is done, energy has moved from one store to another, and the amount is the same.

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Tathmini ya Somo

Hongera kwa kukamilisha somo la Work And Power. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.

Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.

Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.

Work done is calculated using: A) force x time B) force x distance moved in the direction of the force C) force / distance D) mass x speed Answer: B
A force of 30 N moves a box 5 m in the direction of the force. The work done is: A) 6 J B) 35 J C) 150 J D) 900 J Answer: C
If the speed of an object doubles, its kinetic energy: A) stays the same B) doubles C) is four times greater D) is halved Answer: C
Power is defined as: A) the total energy transferred B) force x distance C) the rate of transfer of energy D) energy x time Answer: C
A machine does 6000 J of work in 30 s. Its power is: A) 20 W B) 200 W C) 2000 W D) 180000 W Answer: B

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Vitabu Vinavyopendekezwa

Pearson Edexcel International GCSE (9-1) Science Double Award Student Book

Manukuu: First edition

Mchapishaji: Pearson Education

Mwaka: 2018

ISBN: 978-0-435-19150-8

Maelezo: Endorsed student book covering the full 4SD0 specification across Biology, Chemistry and Physics.

Jifunze zaidi kutoka vyanzo huria

Sehemu ya kitabu Work, Power, and the Work–Energy Theorem OpenStax · Physics
Describe and apply the work–energy theorem

"Physics: Work, Power, and the Work–Energy Theorem" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/physics/pages/9-1-work-power-and-the-work-energy-theorem. Access for free at https://openstax.org/books/physics/pages/1-introduction
Sehemu ya kitabu Mechanical Energy and Conservation of Energy OpenStax · Physics
Explain the law of conservation of energy in terms of kinetic and potential energy

"Physics: Mechanical Energy and Conservation of Energy" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/physics/pages/9-2-mechanical-energy-and-conservation-of-energy. Access for free at https://openstax.org/books/physics/pages/1-introduction

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