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Q.1. Fill in the blanks:
(i) The branch of Physics, which deals with the behaviour of moving objects, is known as _____.
(ii) An object is said to be in _____ if it changes its position with respect to its surroundings in a given time.
(iii) A _____ is another object of scene with respect to which we compare an object's position.
(iv) The distance time graph for ____ is a straight line.
(v) A non uniform motion is also called an ____ motion.
Q.2. The numerical ratio of displacement to distance for a moving object is:
(a) Always less than 1
(b) Equal to 1 or more than 1
(c) Always more than 1
(d) Equal to 1 or less than 1
Q.3. A boy is sitting on a merry-go-round which is moving with a constant speed of 10 m S–1. This means that the boy is:
(a) At rest
(b) Moving with no acceleration
(c) In accelerated motion
(d) Moving with uniform velocity
Q.4. In which of the following cases of motion, the distance moved and the magnitude of displacement are equal ?
(a) If the car is moving on straight road
(b) If the car is moving on circular road
(c) If the pendulum is moving to and fro
(d) If a planet is moving around the sun
Q.5. The speed of a moving object is determined to be 0.06 m/s. this speed is equal to:
(a) 2.16 km/h
(b) 1.08 km/h
(c) 0.216 km/h
(d) 0.0216 km/h
Q.6. Is displacement a scalar quantity?
Q.7. State whether distance is a scalar or a vector quantity.
Q.8. Give one example of a situation in which a body has a certain average speed but its average velocity is zero.
Q.9. Which of the two can be zero under certain conditions: average speed of a moving body or average velocity of a moving body?
Q.10. What does the path of an object look like when it is in uniform motion?
Q.11. Distinguish between speed and velocity.
Q.12. An object has moved through a distance. Can it have zero displacement? If yes, support your answer with an example.
Q.13. State which of the following situations are possible and give an example for each of these:
(a) an object with a constant acceleration but with zero velocity
(b) an object moving in a certain direction with an acceleration in the perpendicular direction.
Q.14. A train starting from rest moves with a uniform acceleration of 0.2 m/s2 for 5 minutes. Calculate the speed acquired and the distance travelled in this time.
Q.15. State an important characteristic of uniform circular motion. Name the force which brings about uniform circular motion.