NCERT Class 9 Science Chapter 8 Force and Laws of Motion Solutions
NCERT Class 9 Science Chapter 8 Force and Laws of Motion Solutions GENERAL SCIENCE TEXTUAL QUESTIONS AND ANSWERS INTEX QUESTIONS AND ANSWERS 1. Which of the following has more inertia: (a) A rubber ball and a stone of the same size? Ans. (a) A stone. (b) A bicycle and a train? Ans: A train. (c) A five-rupees coin and a one-rupee coin? Ans: A five-rupees coin. Because, the inertia of an object is measured by its mass and heavier or more massive objects offer larger inertia. 2. In the following example, try to identify the number of times the velocity of ball changes: “A football player kicks a football to another player of his team who kicks the football towards the goal. The goalkeeper of the opposite team collects the football and kicks it towards a player of his own team.” Also identify the agent supplying the force in each case. Ans. The velocity of the ball changes four times. As a football player kicks the football, its speed changes from zero to a cer...