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User Name Thread Name Subject Posted
Les Jones BS: Newton's Laws (47) RE: BS: Newton's Laws 28 May 02

It is very difficult to believe that when you push them, tables and walls push back. If you push a beach ball under water and let it go, the water will push the ball back and it will jump up. if you press down on a trampoline it will push you back. All surfaces behave like very stiff trampolines, push on them and just like water and trampolines they push back.

Most objects experience a range of forces: gravity, friction, pushes, pulls, stretches and squashes. If they all cancel each other out, ie 'balance' the object will not move, say a person sitting still on a chair, or they carry on moving at a constant speed, like a person sitting still on a chair on a planet moving around a star.

If some forces are greater, in a particular direction, ie 'unbalanced', the object will accelerate in that direction, and continue to accelerate unless some other force comes into play

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