Turning away from him, moving across the room to put the pizza down between the door and the table lamp, I asked him the cost and took time rustling through my purse for the money knowing my silhouette would be revealed. At the same time I discreetly pulled the top of the robe before skipping back towards him, knowing much more of my cleavage would easily slip into view. By this time he had obviously sussed our game and our willing victim saucily commented on his lucky night, intensifying my arousal. I purposely took time counting small change into his hand, giving him ample opportunity to enjoy my erect nipple which had now conveniently slipped into view. Apologising to him, I called for an extra pound; Dave replied and called me into the bedroom. Immediately as I entered the room, Dave could not resist drawing me close to him slipping his finger between my legs to feel my wetness which sent my tummy into tumbles of excitement. Then wanting to push the envelope to excite us. He was now looking forward to his physics lecturer telling him about the physics of transport. Reg proposed to ask what similarity there was between moving trains on railway tracks and snow crunching underfoot. It was something to do with traction and slip, he understood, but he was interested in how the lecturer approached it.Surprisingly, the man was up to the challenge, when Reg asked this at the end of the lecture.“Mr Robertson, the question boils down to two opposing forces: Friction and slip. In the case of trains, the friction between wheel and rail – two steel surfaces – is very small, so the force needing to be applied to make the wheels turn is relatively small. This why rail transport is so efficient.Applying a much greater force causes the wheels to slip, and this is observable when a steam engine starts up too sharply. The wheels spin and then catch again, so the engine driver has to lower the motive force to allow traction to take place with this level of friction.In a.
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