resultant force - The total force resulting from two or more forces acting upon a single object. Found by adding the forces, taking into account their directions., balanced forces - When the forces acting on an object are in opposite directions and are the same size so that there is a zero-resultant force., unbalanced forces - When the forces in opposite directions acting on an object do not cancel out, so there is a non-zero resultant force., acceleration - A measure of how quickly the velocity of something is changing. It can be positive if the object is speeding up or negative if it is slowing down., uniform motion - The velocity of a body travelling in a straight line remains the same. This means that the object has zero acceleration., mass - A measure of the amount of material there is in an object. The units are kilograms (kg)., gravitational field strength - A measure of how strong the force of gravity is somewhere. It is the force on a 1-kilogram mass, so the units are newtons per kilogram (N/kg)., weight - The force pulling an object downwards. It depends upon the mass of the object and the gravitational field strength. The units are newtons (N)., centripetal force - A force that causes objects to follow a circular path. The force acts towards the centre of the circle., inertial mass - The mass of an object found from the ratio of force divided by acceleration. It describes an objects resistance to acceleration., action–reaction forces - Pairs of forces on interacting objects. Action–reaction forces are always the same size, in opposite directions, and acting on different objects., equilibrium - When a situation is not changing because all the things affecting it balance out.,

Newton's Laws

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