Contact force, Contact forces act between two objects that are physically touching., Non-contact force, Non-contact forces act between two objects that are not physically touching., Elastic, Materials that return to their original shape once the force is removed, Plastic, Materials that change shape permanently and may even break., Extension, Is the amount length has increased by., Weight, The force that acts on mass due to gravity and is therefore measured in newtons (N)., Mass, A measure of the amount of matter an object is made out of. Mass is measured in kilograms (kg)., Friction, A contact force. It acts against the movement of an object., Pressure, Pressure is a measure of how much force is acting on an area., Balanced forces, A pair of opposite forces, equal in size. Stationary objects and those travelling at steady speed have balanced forces., Unbalanced forces, A pair of opposite forces, unequal in size. Unbalanced forces mean objects can speed up or slow down..

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