Two friends were going for a short tour and on the way the car suddenly stopped. Both of them managed to push the car of mass 1100 kg at a uniform velocity along a level road. In the meantime a villager came to help them and the same car was now pushed by three persons at an acceleration of 0.2 m/s2 . After reading the passage carefully answer the following questions: (𝒊) With what force does each person push the car? (𝒊𝒊) Which value is promoted here? (Consider that each person pushes the car with the same efficiency.) Open Answer »
A horse continues to apply a force in order to move a cart with a constant speed. Explain why? Open Answer »
The velocity-time graph of an object of mass m = 120 50 g is shown in figure. Observe the graph carefully and answer the following questions. (a) Calculate the force on the object in time interval 0 to 3 s. (b) Calculate the force on the object in the time interval 6 to 10 s. (c) Is there any time interval in which no force acts on the object? Justify your answer. Open Answer »
Two balls of the same size of different materials, rubber and iron are kept on the smooth floor of a moving train. The brakes are applied suddenly to stop the train. Will the balls start rolling? If so, in which direction? Will they move with the same speed? Give reasons for your answer. Open Answer »