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Constant speed and acceleration

Constant speed and acceleration

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Newton's First Law states that an object will remain at rest or continue moving at a constant velocity, unless it is acted upon by an external resultant force. When there is no resultant force acting on an object, the object is said to be in equilibrium.

Newton's first law

By Newton's First Law, an object at rest will have no forces acting on it. An object lying at rest on the ground will only experience its downwards weight and the upwards normal reaction exerted by the ground on it. If an external resultant force is exerted on the object, then the object will no longer be at rest and will accelerate in the direction of the force.

Objects at rest

By Newton's First Law, an object travelling at constant velocity must have balanced forces acting on it. If an external resultant force acts on the object, then the object will accelerate in the direction of the force.

Objects moving with constant velocity

By Newton's First Law, an object that is accelerating or decelerating must have unbalanced forces acting on it. Newton's Second Law can then be used to calculate the acceleration using the resultant force acting on the object.

Accelerating objects

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