Larryz

Sound waves are longitudinal so soud travels in the same direction of as the vibration. So if a ruler vibrates up and down how does it travel accross the room to be heard.

Thanks to both responses. I did not realise the exact connection of the mass with gravity.

Some metals are not magnetic I had a hunch that they might use electromagnetic induction rate of change of flux linkage etc but does this work for gold etc

I understand owing to or at least partly owing to f = ma in a vacumn all object free fall at the same speed/ velocity. So a = f/m so a mass of 10kg and a mass of 1kg so a = 10 * 10 / 10 = 10m/s. and a = 1 * 10 / 1 = 10 m/s. Which confirms the same accelerstion for both masses. IF we take gravity to be a force like a spring and the same masses on frictionless wheels representing a vacumn. If we put the same tension in the spring for both masses. It feels as if the lighter weight acted up by the spring in a horizontal direction accross the floor will move much more quickly than the heavier weight. In the same way as if someone shoves a skinny man or a fat man with the same force. It feels as if frree fall is different than the examples on the floor. I am aware that momentum mass x velocity is conserved. Owing to the lower velocity but larger mass and higher velocity and smaller mass. However why are the speeds not the same in the on the floor example. When the only difference seems to be free fall downwards as oppposed to freeflow with a fixed force horizontally?