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Reflections on concepts
1. Distinguish between speed and velocity. (AS)
2. Briefly explain about constant acceleration?
3. How can you say that a body is in motion? Is it a co
4. Are average speed and average velocity same? If no
5. How do you measure instantaneous speed? (AS)
6. Explain acceleration with an example ? (AS)
Answers
Answer:
1.Speed, being a scalar quantity, is the rate at which an object covers distance. On the other hand, velocity is a vector quantity; it is direction-aware. Velocity is the rate at which the position changes. The average velocity is the displacement or position change (a vector quantity) per time ratio.
2. Sometimes an accelerating object will change its velocity by the same amount each second. This is referred to as a constant acceleration since the velocity is changing by a constant amount each second. An object with a constant acceleration should not be confused with an object with a constant velocity.
3. If there is a change in the position or state of the object, then the body is said to be in motion. Yes, it is common property. for example, running horse, vehicle moving, human running, jogging etc.
4. Average speed does not have to equal the magnitude of the average velocity. People may think that average speed and average velocity are just different names for the same quantity, but the average speed depends on distance and average velocity depends on displacement.
5. Instantaneous speed (v) = distance/ time
Instantaneous speed is always greater than or equal to zero.
6. The definition of acceleration is a change in the rate of motion, speed or action. An example of acceleration is increasing your driving speed from 45 to 55 to merge with traffic. A moving body that follows a curved path, even when its speed remains constant, is undergoing acceleration.
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