MCQ - CBSE Class 9 Science According to the third law of motion when we push on an object, the object pushes back on us with an equal and opposite force. If the object is a massive truck parked along the roadside, it will probably not move. A student justifies this by answering that the two opposite and equal forces cancel each other. Comment on this logic and explain why the truck does not move. 10/01/2023 Ajit kumar 70 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Using a horizontal force of 200 N, we intend to move a wooden cabinet across a floor at a constant velocity. What is the friction force that will be exerted on the cabinet ? 10/01/2023 Ajit kumar 80 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Why is it advised to tie any luggage kept on the roof of a bus with a rope? 10/01/2023 Ajit kumar 93 Views 0 Comments Read more
MCQ - CBSE Class 9 Science When a carpet is beaten with a stick, dust comes out of it. Explain. 10/01/2023 Ajit kumar 83 Views 0 Comments Read more
MCQ - CBSE Class 9 Science An object experiences à net zero external unbalanced force. Is it possible for the object to be travelling with non-zero velocity? If yes, state the conditions that must be placed on the magnitude and direction of the velocity. If no, provide reason. 10/01/2023 Ajit kumar 83 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Explain, why is it difficult for a fireman to hold a hose, which ejects large amounts of water at a high velocity. 10/01/2023 Ajit kumar 88 Views 0 Comments Read more
MCQ - CBSE Class 9 Science If action is always equal to the reaction, explain how a horse can pull a cart. 10/01/2023 Ajit kumar 53 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Why do you fall in the forward direction when a moving bus brakes to a stop and fall backwards when it accelerates from rest? 10/01/2023 Ajit kumar 85 Views 0 Comments Read more
MCQ - CBSE Class 9 Science Explain why some of the leaves may get detached from a tree if we vigorously shake its branch. 10/01/2023 Ajit kumar 76 Views 0 Comments Read more
MCQ - CBSE Class 9 Science In the following example, try to identify the number of times the velocity of the 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. 10/01/2023 Ajit kumar 134 Views 0 Comments Read more