1. i am doing a science experiment with daughter, here is my question. we can move a magnet attached to a toy with another magnet. but why does it stop working when we strap both magnets to the toy?

2.

3. I'm not quite sure what you mean. Can you describe what you are doing in a bit more detail.

What does "stop working" mean? What stops doing what? (Sorry if I am being dim...)

4. Originally Posted by Strange
I'm not quite sure what you mean. Can you describe what you are doing in a bit more detail.

What does "stop working" mean? What stops doing what? (Sorry if I am being dim...)
not at all, figured i didnt explain that well. basically we strap a magnet to a toy car, we can then push that toy with another magnet with the poles repelling power. But if we strap both magnets to the same toy with the two repelling poles within range (determined from when we held the one and it pushed the toy) the toy no longer moves

5. The forces cancel out. By strapping both to the toy, you effectively make them one with the toy. The toy won't move for the same reason that you pushing on the steering wheel doesn't move the car forward.

6. Originally Posted by KALSTER
The forces cancel out. By strapping both to the toy, you effectively make them one with the toy. The toy won't move for the same reason that you pushing on the steering wheel doesn't move the car forward.
thanks. how about if we put something between the two magnets effectively making the toy have no magnets, then remove what is blocking the field, I guess the best thing for me to do is try it, lol in a lazy mood.

7. Still the same. Both are tied to the toy and each is pushing the other in opposite directions. Same reason you can't pick yourself up from the ground. There needs to be an external push that imparts momentum to the object.

8. When you moved the car by pushing it with the repulsive force of the like poles of the magnets the motive force came from you pushing the car, not from the magnets. In terms of the net forces involved the magnets are irrelavent. It does not matter if you transmit force to the toy by pushing it with the repulsive magnetic force or by pushing it with a stick, the motive force is still coming from your muscles.

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