[DSE物理]考前問答區

上個星期考完mock 而家好迷惘 唔知點溫好 我想問我而家應該從咩方面入手
利申:retaker 想由4上5 or above

邊到考？

遵理Wayne Leung嗰個...難到仆街
Btw如果我報返CW Sham revision嘅mechanic同埋E&M兩個單元 會唔會趕唔切

大概知道份卷，應該算係有d離地

上個星期考完mock 而家好迷惘 唔知點溫好 我想問我而家應該從咩方面入手
利申:retaker 想由4上5 or above

邊到考？

遵理Wayne Leung嗰個...難到仆街
Btw如果我報返CW Sham revision嘅mechanic同埋E&M兩個單元 會唔會趕唔切

你要睇下你溫唔溫得切，CW d野都算多
自己衡量下溫phy同其他科嘅時間

如果aim冇5以上，elective可以唔洗溫

好似係

今年engine yr1, 想問下
s=ut+1/2at^2
v=u+at
v^2=u^2+2as
之類只可以用於constant acceleration既式
會唔會有機會用到係non-constant acceleration既情況?

同埋integrate( (a) dt) = v,
換言之係唔係講緊area under curve of v-t graph = a? (v乘t = a)
咁integrate( (a) dx) 係唔係等於 v^2 ? (a乘x = x^2/t^2 = v^2)

THX

巴打可否貼下題

估下今年出咩

溫到冇方向

貼題，可能要等下個月，依家都幾忙

你想拿level幾？

想衝5**

今年engine yr1, 想問下
s=ut+1/2at^2
v=u+at
v^2=u^2+2as
之類只可以用於constant acceleration既式
會唔會有機會用到係non-constant acceleration既情況?

同埋integrate( (a) dt) = v,
換言之係唔係講緊area under curve of v-t graph = a? (v乘t = a)
咁integrate( (a) dx) 係唔係等於 v^2 ? (a乘x = x^2/t^2 = v^2)


THX

只適用於motion with constant acceleration

integrate a (from t1 to t2) = Delta v
= change in velocity from time t1 to t2
= area under the curve of a-t graph

v 乘 t =/= a

integrate a dx
a = dv/dt = dv/dx dx/dt = v dv/dx
so
integrate a dx = integrate v dv = 1/2 v^2

今年engine yr1, 想問下
s=ut+1/2at^2
v=u+at
v^2=u^2+2as
之類只可以用於constant acceleration既式
會唔會有機會用到係non-constant acceleration既情況?

同埋integrate( (a) dt) = v,
換言之係唔係講緊area under curve of v-t graph = a? (v乘t = a)
咁integrate( (a) dx) 係唔係等於 v^2 ? (a乘x = x^2/t^2 = v^2)


THX

只適用於motion with constant acceleration

integrate a (from t1 to t2) = Delta v
= change in velocity from time t1 to t2
= area under the curve of a-t graph

v 乘 t =/= a

integrate a dx
a = dv/dt = dv/dx dx/dt = v dv/dx
so
integrate a dx = integrate v dv = 1/2 v^2

我打錯左，應該係a乘t=v