Making Things Work

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Newton’s first law states that an object will remain at rest or continue to move in a straight line unless an external force acts on it. this means that for an object to move in a circular path, there must be a force acting on it, this is known as a centrepetal force. As mass increases, the centrepetal force also increases. As the radius decreases, the centrepetal force increases. As the speed increases, so does the centrepetal force.

The centre of mass of an object is the point where its mass is appearing to be concentrated. To calculate the period of a pendulum, we use the formula: time = 1 / frequency.

The moment must be equal on both sides of an object, moment = force (weight) x distance. A moment is the turning force acting on an object, turning effect created by a force at a


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