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Question 1: What does the odometer of an automobile measure? Answer:The odometer of an automobile measures the distance covered by an automobile. Question 2:What is the quantity which is measured by the area occupied below the velocity−time graph? Distance Consider the velocity−time graph of a uniformly moving body. Let the velocity of the body at time (t) be v. Area of the shaded region = length × breath Where, Length = t Breath = v Area = vt = velocity × time …(i) We know, \ Distance = Velocity × Time…(ii) From equations (i) and (ii), Area = Distance Hence, the area occupied below the velocity−time graph measures the distance covered by the body. Question 4. What can you say about the motion of an object if its speed−time graph is a straight line parallel to the time axis? Object is moving uniformly. A straight line parallel to the time axis in a speed−time graph indicates that with a change in time, there is no change in the speed of the object. This indicates the uniform motion of the object. Question 5.Abdul, while driving to school, computes the average speed for his trip to be 20 km h−1. On his return trip along the same route, there is less traffic and the average speed is 40 km h−1. What is the average speed for Abdul’s trip? Answer:Refer To the Download section. |
