C. Answer the following Questions (in One Sentence only) 1. What is the essential condition for motion? 2. Under what condition, is displacement of an object equal to the distance covered by it during a given time? 3. Define speed for a moving object. 4. What do you mean by velocity of an object? 5. Define acceleration. 6. Give one example each of positive acceleration and negative acceleration 7. The distance-time graph of a moving object is a straight line inclined to the time axis. What do you conclude about the nature of motion?
Answers
Answer:
1.
An object has moved through a distance. Can it have zero displacement? If yes support your answer with an example.
SOLUTION:
Yes, the object instead of moving through a distance can have zero displacement. Example: If an object travels from point A and reaches to the same point A, then its displacement is zero.
Q 2.
A farmer moves along the boundary of a square field of side 10 m in 40 s. What will be the magnitude of displacement of the farmer at the end of 2 minutes 20 seconds?
SOLUTION:
Q 3.
Which of the following is true for displacement? (A) It cannot be zero. (B) Its magnitude is greater than the distance travelled by the object.
SOLUTION:
A. False.
B. False
Q 4.
Distinguish between speed and velocity?
SOLUTION:
Q 5.
Under what condition(s) is the magnitude of average velocity of an object equal to its average speed?
SOLUTION:
The magnitude of average velocity of an object is equal to its average speed if the object moves in a straight line in a particular direction.
Q 6.
What does the odometer of an automobile measure?
SOLUTION:
The odometer of an automobile measures the distance travelled by a vehicle.
Q 7.
What does the path of an object look like when it is in uniform motion?