... out, giving no overall force. In the last case it could be said that the forces are 'balanced'. If there is no force acting, or if all the forces acting on an object are balanced, then there will be no change taking place. An object at rest will remain at rest, and a moving object will continue to move, keeping the same speed and travelling in the same direction. The mass of an object tells us how much matter it contains and is measured in the unit of kilograms (kg). Whereas mass is a scalar quantity (magnitude only), forces are vector quantities, meaning they have both direction and magnitude. Acceleration is the rate at which the velocity of an object changes, over a period of time. It is measured in metres-per-second per second (m/s/s) or meters-per-second squared (m/s²), and it tells you how much the velocity will change each second. The acceleration ...

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