Work And Power
Gbogbo ọrọ náà
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.
Ebumnobi
- 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
Akọmọ Ojú-ẹkọ
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ayẹwo Ẹkọ
Ekele diri gi maka imecha ihe karịrị na Work And Power. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- 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
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Àwọn Ìwé Tó Dáa Láti Kà
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Work And Power? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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