acceleration - How quickly speed increases or decreases., air resistance - The force on an object moving through the air that causes it to slow down (also known as drag)., average speed - The overall distance travelled divided by overall time for a journey., balanced forces - Forces acting on an object that are the same size but act in opposite directions., contact force - Force that acts by direct contact, e.g., friction., distance–time graph - A graph that shows how far an object moves each second., driving force - The force that is pushing or pulling something., equilibrium - State of an object when all forces are balanced., field - The region where other objects feel a gravitational force., friction - Force opposing motion which is caused by the interaction of surfaces moving over one another. It is called ‘drag’ if one is a fluid., gravitational field - The force from gravity on 1 kg (N/kg)., gravity - A non-contact force that acts between two masses., interaction pair - When two objects interact there is a force on each one that is the same size but in opposing directions., kilogram - A unit of mass, symbol kg., mass - The amount of stuff in an object (kg)., metres per second - A unit of speed., newton - Unit for measuring forces (N)., newtonmeter - A piece of equipment used to measure weight in newtons., non-contact force - Force that acts without direct contact, e.g., magnetism., pull - A type of force towards, push - A type of force away, relative motion - Different observers judge speeds differently if they are in motion too, so an object’s speed is relative to the observer’s speed., resistive force - Any force that acts to slow down a moving object., resultant force - Single force that can replace all the forces acting on an object and have the same effect., speed - How much distance is covered in a given time., unbalanced - Opposing forces on an object that are unequal., weight - The force of gravity due to the Earth (or other planet or moon) on an object (N).,

Forces 1 - KS3 - AQA

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