AQA A Level Physics復(fù)習(xí)筆記4.7.1 Density
Density Density is the?mass per unit volume?of an object Objects made from low-density materials typically have a lower mass For example, a balloon is less dense than a small bar of lead des...
AQA A Level Physics復(fù)習(xí)筆記4.6.5 Kinetic & Gravitational Potential Energy
Kinetic & Gravitational Potential Energy Kinetic Energy Kinetic energy is the energy an object has due to its?motion?(or velocity) The faster an object is moving, the greater its kinetic...
AQA A Level Physics復(fù)習(xí)筆記4.6.4 Conservation of Energy
The Principle of Conservation of Energy The Principle of Conservation of Energy states that: Energy cannot be created or destroyed, it can only be transferred from one form to another This m...
AQA A Level Physics復(fù)習(xí)筆記4.6.3 Efficiency
Efficiency The efficiency of a system is a measure of how well energy is transferred in a system Efficiency is defined as?the ratio of the useful power output from a system to its total powe...
如何準(zhǔn)備牛劍心理學(xué)專業(yè)面試？
很多同學(xué)都對(duì)心理學(xué)專業(yè)牛津劍橋的面試感到一定的緊張，其實(shí)大可不必，引用劍橋大學(xué)考官的一句話，“這場(chǎng)面試不是為了為難同學(xué)們，而是給大家機(jī)會(huì)，讓一群對(duì)這個(gè)專業(yè)感興趣的人聚在一起，暢所欲言。” 那么面試前我...
衛(wèi)報(bào)：A-level學(xué)生申請(qǐng)頂尖大學(xué)錄取率大幅下降！
《衛(wèi)報(bào)》： A-level學(xué)生申請(qǐng)頂尖大學(xué)錄取率降至55%！ 成千上萬(wàn)名優(yōu)秀A-level學(xué)生不會(huì)獲得頂尖大學(xué)offer！ A-level學(xué)生申請(qǐng)頂尖大學(xué)錄取率降至55% 根據(jù)《衛(wèi)報(bào)》報(bào)道，英國(guó)高等院校招生辦公室(UCAS)的數(shù)據(jù)顯示，申...
AQA A Level Physics復(fù)習(xí)筆記4.6.2 Area Under a Force-Displacement Graph
Area Under a Force-Displacement Graph The work done can also be found from a force-displacement graph If the force is not constant and is plotted against the displacement of the object: The ...
AQA A Level Physics復(fù)習(xí)筆記4.6.1 Work & Power
Work & Power Work is defined as The amount of energy transferred when an external force causes an object to move over a certain distance If the force is parallel to the direction of the ...
AQA A Level Physics復(fù)習(xí)筆記4.5.5 Collisions
Elastic & Inelastic Collisions In both collisions and explosions, momentum is always conserved However,?kinetic energy?might not always be A collision (or explosion) is either: Elastic?–...
AQA A Level Physics復(fù)習(xí)筆記4.5.4 Impulse on a Force-Time Graph
Impulse of a Force-Time Graph In real life, forces are often not constant and will vary over time If the force is plotted against time,?the impulse is equal to the area under the force-time ...
AQA A Level Physics復(fù)習(xí)筆記4.5.3 Impulse
Force & Momentum Force is defined as the?rate of change of momentum?on a body The change in momentum is defined as the final momentum minus the initial momentum These can be expressed as...
AQA A Level Physics復(fù)習(xí)筆記4.5.2 Conservation of Momentum
The Principle of Conservation of Momentum The principle of conservation of linear momentum states: The total momentum before a collision = the total momentum after a collision provided no ex...
