Physics keys words for KS3 with a VI (24pt) font too. Near the Earth's surface, Average time taken for the number of nuclei of the isotope (or mass of the isotope) in a sample to halve, The extension of a spring is directly proportional to the force applied provided the limit is not exceeded, The pressure in a liquid in a hydraulic arm, Electromagnetic waves between visible light and microwaves in the electromagnetic spectrum, Material or object that is a poor conductor, A charged particle that is produced by the loss or gain of electrons, Any process in which atoms become charged, Atom that has the same number of protons but a different number of neutrons. An eye that cannot focus on nearby objects, A device in which a force applied at a point produces another force at another point, A converging lens used to magnify a small object that must be placed between the lens and the focal point, The main stage in the life of a star during which it radiates energy because of the fusion of hydrogen nuclei in its core, The quantity of matter in an object. Transfer of energy from particle to particle in matter via free electrons. force. The device is capable of amplification, etc, and has replaced the valve in most circuits since it is much smaller, more robust, and works at a much lower voltage, the part of the electromagnetic spectrum with wavelengths shorter than light but longer than X-rays; in the range 0.4 × 10, a region containing no matter; free space, a measure of the rate of motion of a body expressed as the rate of change of its position in a particular direction with time. Rise and fall of sea level because of the gravitational pull of the moon and sun, When the angle of incidence of a light ray in a transparent substance is greater than the critical angle. They are responsible for the force between nucleons in the atomic nucleus, electromagnetic radiation in the wavelength range 0.3 to 0.001 metres: used in radar, cooking, etc, the product of a physical quantity, such as force or mass, and its distance from a fixed reference point, the product of a body's mass and its velocity, a positive or negative elementary particle with a mass 207 times that of an electron and spin, a stable leptonic neutral elementary particle with very small or possibly zero rest mass and spin, a neutral elementary particle with a rest mass of 1.674 92716 × 10, the derived SI unit of force that imparts an acceleration of 1 metre per second to a mass of 1 kilogram; equivalent to 10, a proton or neutron, esp one present in an atomic nucleus, the central portion in the head of a comet, consisting of small solid particles of ice and frozen gases, which vaporize on approaching the sun to form the coma and tail, the derived SI unit of electrical resistance; the resistance between two points on a conductor when a constant potential difference of 1 volt between them produces a current of 1 ampere, the principle that the electric current passing through a conductor is directly proportional to the potential difference across it, provided that the temperature remains constant. Components connected in a circuit so that the same current that passes through them are in series with each other, An eye that cannot focus on distant objects but can focus on near objects, A pendulum consisting of a small spherical bob suspended by a thin string from a fixed point, A mains socket is used to connect the mains plug of a mains appliance to an electrical circuit, Electrical Cell that produces a voltage when in sunlight. The far point of a normal eye is at infinity, Inefficient electrical device designed to produce light, The distance from the centre of a lens to the point where light rays parallel to the principal axis are focused. Electromagnetic Radiation that has been travelling through space ever since it was created shortly after the big bang. It is measured in newton seconds per metre squared, the derived SI unit of electric potential; the potential difference between two points on a conductor carrying a current of 1 ampere, when the power dissipated between these points is 1 watt, the derived SI unit of power, equal to 1 joule per second; the power dissipated by a current of 1 ampere flowing across a potential difference of 1 volt. Ignored words will never appear in any learning session. An object in space that has so much mass, that nothing, not even light, can escape from its gravitational field, Decrease in the wavelength of electromagnetic waves emitted by a star or galaxy moving towards us. Sealed panel designed to use sunlight to heat water running through it. Time taken for a power station to produce energy after it is switched on. 1 joule is equivalent to 1 watt-second, 10, the basic SI unit of thermodynamic temperature; the fraction, the energy of motion of a body, equal to the work it would do if it were brought to rest. Acceleration and force are vectors; in this law the direction of the force vector is the same as the direction of the acceleration vector, For every action there is an equal and opposite reaction, the condition of a system in which competing influences are balanced, vector produced when two or more forces act upon a single object; calculated by addition of the force vectors, a vector that can cause an object with mass to accelerate, amount of force required to give a mass of 1 kg an acceleration of 1 m/s, force resisting the relative motion of two surfaces in contact, a body in motion remains in motion, a body at rest remains at rest, component, perpendicular to the surface of contact, of the contact force exerted by the surface, base unit of mass in the International System of Units, measurement of the gravitational force acting on an object, force that resists the movement of a solid through a liquid or gas, pictorial representation used to analyze to forces acting on a free body, showing all contact and non-contact forces acting on the body, when a free-falling object's upward force equals the force of gravity, causing the net force to be zero and resulting in an acceleration of zero, a pair of forces that are equal in magnitude and opposite in direction, globally accepted measurements for observations - meters (m), kilograms (kg), time (s), Kelvin (K), temperature/Celsius (C), international system of units (SI), a statement that is true and has been proven to be so by multiple repeated observations, a proposed scientific explanation made on the basis of limited evidence as a starting point for further investigation, a principle based on the predictable consequences of an act or condition, body of techniques for observations to gain knowledge, well-tested explanation that unifies a broad range of observations / a coherent group of general propositions used as principles of explanation for a class of phenomena, cannot be disproved - under the power of the leader, simply accepted by all (like school), based on (can be disproved by) observation or experience; practicing logic, using scientific method, encourages skepticism, distance travelled over time taken (change of distance over change of time), falling under the sole influence of gravity, a ratio indicating a relationship between 2 measurements with different or the same units, motion determined by a changeable reference point, rate of change of position, can be positive, negative, or zero (indicates direction of motion).