The property that describes an object's resistance to changes in motion is called

• A. Gravity
• B. Inertia
• C. Friction
• D. Velocity

Answer: (B)

Inertia is the tendency of an object to resist changes to its motion or rest. This means it takes a certain amount of force to start moving a stationary object or to bring a moving object to a stop, and the resistance to that change grows with the object's mass. This concept comes from Newton's first law of motion: objects keep doing what they’re doing unless something else acts on them.

Gravity is a force that pulls objects toward the center of the Earth, not a property describing resistance to motion. Friction is the force that opposes motion between surfaces, helping to slow or stop movement. Velocity describes how fast something is moving and in what direction, not how hard it is to change that motion. So the term that matches the idea of resisting changes in motion is inertia.