# Newton's Law of Motion

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IGCSE Physics Lessons
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A series of free GCSE/IGCSE Physics Notes and Lessons.

Newton's First Law of Motion
If the resultant force acting on a stationary object is zero, then the object will remain stationary.
If the resultant force acting on a moving object on a moving object is zero, then the object will continue moving with the same velocity.
Describe Newton's first law of motion.
Apply Newton's first law to moving and stationary objects.

Newton's Second Law of Motion
Describe Newton's second law of motion and calculate the force requires to accelerate an object.
Estimate speed, acceleration and forces for everyday road transport.
Describe what is meant by inertia and inertial mass.
The equation for the Second Law of motion is:
F = ma
The acceleration of an object is proportional to the resultant force acting on the object and inversely proportional to the mass of the object.
Newton's Third Law of Motion
Describe and apply Newton's third law of motion.
Every action has an equal and opposite reaction.
Whenever two objects interact, the forces they exert on each other are equal and opposite.

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