# Tag Info

## Hot answers tagged collision

2 votes

### If $F=ma$ does that mean objects traveling at cosntant speeds have no force?

It means that in order for the elephant to remain at that velocity, the vector sum of all forces on the object must be zero, not that there are no forces on it. By specifying constant velocity, there ...
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2 votes

Hint: $\vec p = \sum \vec p_i = const.$ Ok, assuming: this really is no homework you know that r, v, p and M all are vector quantities $E_{kin}$ is a scalar from a scalar product $\sum \frac{1}{m_i}... • 224 1 vote ### If$F=ma$does that mean objects traveling at cosntant speeds have no force? If an elephant, mass$3500\,\rm kg$, running at$7\,\rm m/s\,(=25 km/hr)\$ hits you then there must be an interaction between you and the elephant. In other words the elephant exerts a force on you and ...
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