Gravitational Field Lines The direction of a gravitational field is represented by gravitational field lines The gravitational field lines around a point mass are radially inwards The gravit...
Trigonometry Exact Values What are exact values in trigonometry? For certain angles the values of sin θ, cos θ and tan θ can be written exactly This means using fractions and surds You should be fa...
Gravitational Force There is a universal force of attraction between all matter with mass This force is known as the ‘force due to gravity’ or the weight The Earth’s gravitational fie...
Concept of a Force Field A force field is any region of space where a body will experience a non-contact force This will cause the body to move, interact or be deformed in some way A ...
Evolving Models of Gas Behaviour Our knowledge and understanding of the behaviour of gases has changed significantly over time The gas laws were developed by many scientists over thousands o...
Defining Sin, Cos and Tan What is the unit circle? The unit circle is a circle with radius 1 and centre (0, 0) Angles are always measured from the positive x-axis and turn: anticlockwise for positi...
Brownian Motion Brownian motion of particles is the phenomenon when: Small particles (such as pollen or smoke particles) suspended in a liquid or gas are observed to move around in a random,...
Average Molecular Kinetic Energy An important property of molecules in a gas is their average kinetic energy This can be deduced from the ideal gas equations relating pressure, volume, tempe...
Bearings What are bearings? Bearings are a way of describing and using directions as angles They are specifically defined for use in navigation because they give a precise location and/or direction...
What is the sine rule? The sine rule allows us to find missing side lengths or angles in non-right-angled triangles It states that for any triangle with angles A, B and C Where a is the side opposi...
22fall香港留学入境最新政策有什么攻略？如果想要去到香港不隔离的同学，那么针对非香港居民在入境香港前14天没去过香港，广东或澳门以外的其他地区，同时没去过“来港易计划暂不适用的风险地区名单”内的地方，则...
What is the Pythagorean theorem? Pythagoras’ theorem is a formula that works for right-angled triangles only It states that for any right-angled triangle, the square of the hypotenuse is equal to t...
