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Questions and Answers
What is the definition of motion?
What is the definition of motion?
- Tells us the speed and direction of a moving object.
- Tells us the rate speed or direction changes.
- Tells us the rate at which an object moves.
- Is a change in position measured by distance and time. (correct)
What does speed tell us?
What does speed tell us?
The rate at which an object moves, defined by the distance divided by time.
What is velocity?
What is velocity?
The speed and direction of a moving object.
What does acceleration measure?
What does acceleration measure?
If time is increasing to the right and the distance does not change, the object is moving.
If time is increasing to the right and the distance does not change, the object is moving.
An object with increasing time to the right and constant distance is moving at a constant speed.
An object with increasing time to the right and constant distance is moving at a constant speed.
A steeper line on a graph indicates a larger distance moved in a given time.
A steeper line on a graph indicates a larger distance moved in a given time.
A curving line upwards on a graph shows that the object is decelerating.
A curving line upwards on a graph shows that the object is decelerating.
What does a straight horizontal line on a speed-time graph indicate?
What does a straight horizontal line on a speed-time graph indicate?
This graph shows decreasing speed, indicating the moving object is accelerating.
This graph shows decreasing speed, indicating the moving object is accelerating.
What does the dashed line indicate when both dashed and solid lines show increasing speed?
What does the dashed line indicate when both dashed and solid lines show increasing speed?
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Study Notes
Motion Concepts
- Motion refers to a change in position over a given distance and time.
- Speed is defined as the rate of movement, calculated by dividing distance by time.
- Velocity includes both speed and direction of a moving object, providing a more comprehensive description of its motion.
- Acceleration measures the rate at which an object's speed or direction changes, indicating how quickly an object is gaining or losing speed.
Motion Graphs and Interpretations
- A horizontal line in a distance-time graph indicates the object is at rest, as distance remains constant while time increases.
- A straight line sloping upwards in a distance-time graph indicates constant speed, with distance increasing consistently over time.
- The steeper the line on a distance-time graph, the faster the object is moving, as it covers more distance in the same time interval.
- Curved lines in a distance-time graph indicate accelerating motion, with the steepness increasing, signifying that speed is increasing over time.
Speed-Time Graphs
- In a speed-time graph, a horizontal line means speed is constant; there is no change in speed over time.
- An upward slope on a speed-time graph reflects increasing speed, indicating that the object is accelerating.
- A downward slope represents decreasing speed, or deceleration, showing the object is slowing down.
- Dashed and solid lines on a speed-time graph can signify different rates of acceleration; both may reach the same maximum speed, but the solid line implies a slower acceleration.
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