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What is Newtons first law and what does this mean ?
Newtons first law says that the velocity, speed or direction of an object will only change if a resultant force is acting on it.
This means that :
If the resultant force on a stationary object is zero the object will remain stationary
If the resultant force on a moving object is zero then it will continue to move at the same velocity in a straight line.
If the resultant force on an object is not zero its velocity will change
What is Inertia ?
The tendency of an object to remain in a steady state
What is newtons second law ?
Acceleration is directly proportional to the resultant force of an object but inversely proportional to the mass of a object
What is inertial mass ?
A measure of how difficult it is to change the velocity of a object