What does Newton’s first law of motion state?
An object remains at rest or moves in a straight line at constant velocity unless a resultant external force acts on it.
AQA GCSE Combined Science: Trilogy (8464) — Physics — Higher · 6.5.4.2.1
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What does Newton’s first law of motion state?
An object remains at rest or moves in a straight line at constant velocity unless a resultant external force acts on it.
What is an object’s acceleration when the resultant force on it is zero?
Zero.
What is inertia?
The tendency of an object to resist changes in its motion.
How does an object move when the resultant force on it is zero?
If at rest, it remains at rest. If moving, it continues in a straight line at constant speed.
What effect does a non-zero resultant force have on an object's velocity?
It changes the object's velocity.
In what ways can an object's velocity change?
Its speed can increase or decrease, its direction can change, or both can change. A direction change alters velocity even at constant speed.