air resistance, A force that resists an object's motion through air, applied force, A force exerted by a person, animal or machine, balanced force, A force with an equal and opposite force acting on the same object, contact force, Any force that can only occur when two objects are touching, elastic force, A force that occurs when a springy object is squashed or stretched, force, A push or pull, friction, A force that resists an object's motion, gravity, An attractive force between any two objects that have mass, kilogram, The standard unit of mass, magnetism, A force exerted on some metals, such as iron and nickel, net force, The overall force on an object, Newton, The standard unit of force, non-contact force, Any force that can occur even when two objects are not touching, spring balance, A scientific instrument used to measure forces, tension, A force that pulls inward when a solid object is stretched, unbalanced force, A force without an equal and opposite force acting on the same object, weight, The force of gravity on an object

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