Question

explain how newtons law of inertia describes the motion of objects.

Explanation:

Newton's law of inertia (1st law) states that an object at rest stays at rest, and an object in motion stays in motion with constant velocity (same speed and direction) unless acted upon by a net external force. For example, a book on a table remains at rest until a force (like pushing it) acts on it. A moving car continues moving at the same velocity if no net force (e.g., friction, engine force imbalance) acts, but when brakes apply (a force), it slows down. This law explains the tendency of objects to resist changes in their motion state, defining inertia as the property of mass that resists acceleration (change in velocity).

Answer:

Newton's law of inertia (first law of motion) states that an object at rest will remain at rest, and an object in motion will remain in motion with a constant velocity (constant speed in a straight line) unless a net external force acts on it. This law describes that objects have a natural tendency (inertia, related to their mass) to resist changes in their state of motion: stationary objects need a net force to start moving, and moving objects need a net force to speed up, slow down, or change direction. For example, a stationary book on a table stays still until a push (net force) acts on it; a car moving at constant speed on a frictionless road (idealized) would keep moving at that speed forever without a net force (like from brakes or engine) to change its motion.