Q. Suppose you are standing on a train, both feet together, facing a window. The front of the train is to your left. The train starts moving forward. To keep from falling, you slide your right foot out toward the rear of the train. Explain in terms of torque how this action keeps you from falling over.

Q. Two 275 kg masses (611 lb) are separated by a distance of 10 m. Using Newton's law of gravitation, find the magnitude of the gravitational force exerted by one mass on the other.