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  1. 首先,讓我們先弄清楚 work done 的意思, work done...傳送是透過兩件物件之間的 force,如「 work done on object A by object...移動,它仍沒有賺得任何能量,所以沒有 work done。反之,如果車子被推動了...

  2. Work done against friction refers to the energy used by an external agent..., assuming friction is a constant, say f. Then the work done against friction is given by fs, where s is...

  3. 唔係 如果你take upwards係positive 咁 work done when moving up= mgh = 10*10*10= 1000J /1kj work ...12-19 19:09:10 補充: 其實唔洗分兩個case去計 你可以直接先揾displacement 再用 work done=Fs計s = 10 (-10) = 0so by W=Fs W=0J...

  4. ...with △V = 5 dm3 since the volume is doubled. Hence work done = P(△V) = 120 × 103 × 5 × 10-3 = 600J The...

  5. From definition of [ work done], any work done must involve a force and a displacement. If the...displacement are in opposite direction, the force is said to do negative work . Examples: 1. An object falling under gravity, the weight (which...

  6. In an inclined plane, the work done by the force pulling an object up the plane contributes... the frictional force and g is the acceleration due to gravity The work done by the force W = F.L i.e. W = [mg.sin(a...

  7. ...是對的. 雖然total displacement 是0, 但因為過程中出現了兩個不同方向的力, 所以 work done 不是0. 回上面的一位: Work done = F.s...

  8. ...man has less total energy after he performed work on another object. False. Metabolism and respiration...the car. Q: There is a larger work done against friction when moving up an ...

  9. ... A is pulled towards the pulley Now consider work done and energy changes WD by gravitational forces on the...

  10. 唔一定係 要睇係咩 work done如果係 work done by net force,個force就係net force 例如有件野受到...向前力 10N friction work done by friction個force就係10N work done by 50N個force就係50N 題目問時佢一定會講埋係咩force...