Work And Power
Akopọ
Lifting a suitcase, kicking a ball, climbing a hill: every one of these actions involves a force moving through a distance, and every one transfers energy from one store to another. The physics behind them centres on three tightly connected quantities: work, energy and power.
In this lesson you will learn how to calculate work done by a force, gravitational potential energy for an object at height, and kinetic energy for a moving object. You will see how conservation of energy links these stores together, and finish with power, the rate at which energy is transferred. These equations appear on almost every Edexcel Paper 1 sitting.
Awọn Afojusun
- Know and use the relationship between work done, force and distance moved in the direction of the force: work done = force x distance moved, 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 = 1/2 x mass x speed2, KE = 1/2 x m x v2
- 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: power = work done / time taken, P = W / t
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Oriire fun ipari ẹkọ lori Work And Power. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- A force of 50 N pushes a box 4 m across a floor. How much work is done? A) 12.5 J B) 54 J C) 200 J D) 800 J Answer: C
- A 3 kg object is lifted 5 m above the ground (g = 10 N/kg). What is its gravitational potential energy? A) 15 J B) 50 J C) 150 J D) 300 J Answer: C
- A ball of mass 0.2 kg travels at 10 m/s. What is its kinetic energy? A) 1 J B) 2 J C) 10 J D) 20 J Answer: C
- An object falls freely from rest. As it falls, which statement is correct (ignoring air resistance)? A) Its total energy increases B) Its GPE increases and KE decreases C) Its GPE decreases and KE increases by the same amount D) Its KE stays the same Answer: C
- A motor does 6000 J of work in 30 seconds. What is its power? A) 20 W B) 200 W C) 180 000 W D) 6030 W Answer: B
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Awọn Iwe Itọsọna Ti a Gba Nimọran
Ẹ̀kọ́ síwájú láti àwọn orísun ṣíṣí
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Abala ìwé ẹ̀kọ́
Work: The Scientific Definition
The scientific definition of work differs in some ways from its everyday meaning. Certain things we think of as hard work, such as writing an exam or carrying a heavy load on level ground, are not work as defined by a scientist. The scientific definition of work reveals its relationship to energy—wh
"College Physics: Work: The Scientific Definition" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/college-physics/pages/7-1-work-the-scientific-definition. Access for free at https://openstax.org/books/college-physics/pages/1-introduction
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Abala ìwé ẹ̀kọ́
Gravitational Potential Energy
Climbing stairs and lifting objects is work in both the scientific and everyday sense—it is work done against the gravitational force. When there is work, there is a transformation of energy. The work done against the gravitational force goes into an important form of stored energy that we will expl
"College Physics: Gravitational Potential Energy" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/college-physics/pages/7-3-gravitational-potential-energy. Access for free at https://openstax.org/books/college-physics/pages/1-introduction
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