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
Maelezo ya Somo
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
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
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Inapatikana kwenye programu ya Green Bridge
Pakua programu ya Green Bridge CBT kwenye simu yako au kompyuta yako ili kupata maelezo kamili ya masomo, maswali ya mazoezi, na mengi zaidi.
Vitabu Vinavyopendekezwa
Fanya Mazoezi ya Maswali ya Majaribio
Ungependa kufanya mazoezi ya maswali ya majaribio kuhusu Work And Power? Pakua programu ya Green Bridge CBT ili kupata maswali ya majaribio na tathmini kamili za mazoezi kuhusu mada hii.
Pakua Programu Kwenye Google Playstore
Kila kitu unachohitaji ili kufaulu katika JAMB, WAEC & NECO.
