Question
Acceleration is:An object speed when its motion is constant; an object speed is a specific direction; an object direction rate of change; an object velocity rate of change
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GPT-4o mini
Acceleration is defined as the rate of change of velocity of an object with respect to time. It describes how quickly an object is speeding up, slowing down, or changing direction.
To clarify the options you provided:
1. **An object's speed when its motion is constant:** This describes uniform motion, not acceleration. When an object is moving at a constant speed, its acceleration is zero.
2. **An object's speed is a specific direction:** This describes velocity. Speed is a scalar quantity (just how fast an object is moving), while velocity is a vector quantity (how fast and in what direction the object is moving).
3. **An object's direction rate of change:** This partially captures the essence of acceleration, as changing direction is a form of acceleration (even if speed remains constant).
4. **An object's velocity rate of change:** This is the most accurate description of acceleration. Acceleration is the rate at which an object's velocity changes over time, which includes changes in both speed and direction.
In summary, the best definition from your options for acceleration is "an object's velocity rate of change."
To clarify the options you provided:
1. **An object's speed when its motion is constant:** This describes uniform motion, not acceleration. When an object is moving at a constant speed, its acceleration is zero.
2. **An object's speed is a specific direction:** This describes velocity. Speed is a scalar quantity (just how fast an object is moving), while velocity is a vector quantity (how fast and in what direction the object is moving).
3. **An object's direction rate of change:** This partially captures the essence of acceleration, as changing direction is a form of acceleration (even if speed remains constant).
4. **An object's velocity rate of change:** This is the most accurate description of acceleration. Acceleration is the rate at which an object's velocity changes over time, which includes changes in both speed and direction.
In summary, the best definition from your options for acceleration is "an object's velocity rate of change."
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