Twenty first century science past papers
When a force is used to compress a gas, work is done on the gas, leading to an increase in temperature.
Be able to describe the difference between the force-extension relationship for linear systems and for non-linear systems.
Urea is filtered out of the blood by the kidneys into urine.
Be able to calculate surface area : volume ratios. In the gas state, the particles are further apart, and can move freely. Chapter Topic B5. For some materials, the extension is proportional to the applied force, but in other systems, such as rubber bands the relationship is not linear, even though they are elastic.
Most axons have a fatty sheath to increase impulse transmission speed. Be able to explain the differences in density between the different states of matter in terms of the arrangements of the atoms or molecules.
Gcse science questions by topic
In some circumstances the brain can modify a reflex response via a neuron to the motor neuron of the reflex arc e. Similarly, it is the gravitational interaction between a planet and its moons or artificial satellites that keeps them in orbit. For some materials, the extension is proportional to the applied force, but in other systems, such as rubber bands the relationship is not linear, even though they are elastic. Be able to explain, with examples, that to stretch, bend or compress an object, more than one force has to be applied. Be able to recall that gases can be compressed or expanded by pressure changes and that the pressure produces a net force at right angles to any surface. Elasticity and energy stored in a spring gcse physics revision notes P6. A fluid with greater density will experience a greater gravitational force and so exert a greater pressure. Be able to explain that relationship between the distance of each galaxy and its speed is evidence of an expanding universe model. Using the development of the Big Bang model of the beginning of the Universe as an example of how scientific explanations become accepted. Be able to compare type 1 and type 2 diabetes and explain how they can be treated. HT only Be able to explain the use of hormones in modern reproductive technologies to treat infertility Ideas. Be able to explain the need for exchange surfaces and a transport system in multicellular organisms in terms of surface area : volume ratio Practical work: Investigating the effect of surface area : volume ratio on diffusion of dye into agar cubes.
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