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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