an object is in motion when
D. Change in velocity divided by the time required for the change to occur is acceleration. 1  Acceleration occurs when an object slows down as well as speeds up. 2  A change in speed can be used to calculate acceleration.  Acceleration is final speed minus initial speed divided by time, According to Newton's first law... An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force. This law is often called. the law of inertia. C. Friction - a force that resists motion and is always present between two moving surfaces. 1  Static friction- keeps a stationary object from moving on a surface when a force is applied to the object.  Sliding friction- occurs when two surfaces slide past each other; slows down the moving object. Velocity is a vector quantity which expresses both the object's speed and the direction of its motion; therefore, the statement that the object's velocity is constant is a statement that both its speed and the direction of its motion are constant. B. 1---____ law of motion- an object will remain at rest or move in a straight line with constant speed unless a force acts on it. 1. Inertia measures an object’s tendency to remain at rest or keep moving. 2. Inertia is related to mass ; objects with more mass have more inertia. exists and is an alternate of . Making the world better, one answer at a time. An object is deemed to be moving, or in motion, when there is a change in position of an object compared to a stationary object. An object is deemed to be moving, or in motion, when there is a change in position of an object compared to a stationary object. Minor edit? 1 Distance – the entire path an object travels. 2  The distance and direction between starting and stopping positions is displacement.  Relative motion and object’s position change is described in terms of a reference point. Motion (physics) In physics, motion is a change in position of an object with respect to time. Motion is typically described in terms of displacement, distance, velocity, acceleration, time and speed. Motion of a body is observed by attaching a frame of reference to an observer and measuring the change in position of the body relative to that frame. A. Motion is a change in position. 1  Distance – the entire path an object travels. 2  The distance and direction between starting and stopping positions is displacement.  Relative motion and object’s position change is described in terms of a reference point. An object's momentum is directly related to the object's mass and velocity, and the total momentum of all objects in an isolated system (one not affected by external forces) does not change with time, as described by the law of conservation of momentum.
There is a change in position of an object compared to a stationary object.