When an object moves in a circle it continuously accelerates towards the centre of the circle. This acceleration changes the direction of motion of the body, not its speed.The resultant force causing this acceleration is called the centripetal force and is always directed towards the centre of the circle.
The centripetal force needed to make an object perform circular motion increases as:
■ the mass of the object increases
■ the speed of the object increases
■ the radius of the circle decreases.
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