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rate of increase in speed (= change in speed/time) drag that a moving object will experience when moving through the air when two forces are the same strength, but working in opposite directions a force that pulls on an object acceleration air resistance balanced forces attraction a force that needs to touch an object before it can affect it (e.g. friction) air resistance and water resistance are both sometimes called_____ any substance that will return to its original shape and size after it has been stretched or squashed how much longer a object is when it has a force applied compared to its length with no force applied contact force drag elastic extension the force of attraction between any two objects speed at a particular moment speed that stays the same squeeze gravity instantaneous speed constant speed compress force exerted by an object caused by an equal and opposite force the measure of how much mass is in a volume stationary the amount of liquid or gas moved out of the way by a solid floating or immersed in it reaction density at rest / stopped displacement rate at which an object slows down; negative acceleration. often measured in ms-2 energy created by movement amount of matter an object has energy stored in a stretched or compressed spring deceleration kinetic energy mass elastic potential energy a unit for measuring mass (g) a force that resists motion piece of equipment, containing a spring, used to measure forces a push or pull in a particular direction gram friction force meter / Newton meter force force exerted by an object (e.g. the planet) caused by an equal and opposite force – Newton’s 3rd law force in object that opposes them being stretched = mg = mass (m) x acceleration due to gravity (g) two or more forces that do not cancel out support force tension force weight unbalanced force a unit for measuring mass (kg); there are 1000 g in 1 kg force caused by the air which causes an object to rise upwards substance (normally a liquid) used to reduce friction a force that attracts objects made out of iron kilogram lift lubricant magnetism amount of matter that something is made of - measured in grams (g) and kilograms (kg) the unit of force another name for a force meter a force that can affect something from a distance mass Newton (N) Newton meter non contact force a force which acts to repel or push away an object force which exists in response to another force acting on an object - always acts in opposite direction to force causing it force which acts to oppose motion how fast something is moving, often measured in metres per second (ms-1) repulsion reaction resistance speed when two forces working in opposite directions are not the same strength shape which is designed to have very little resistance to its motion a pushing force streamlined thrust unbalanced forces amount of force with which gravity pulls something towards the Earth - measured in Newtons (N) force that is made when all the forces acting on an object are joined together a force is what causes a mass to accelerate; the equation is… weight resultant F = ma a force in a rope or cable being pulled tension zero resultant force