Physics Tutorial. My Cart Subscription Selection. Return to List of Animations. Vectors can't be negative, strictly speaking. But for a 1D vector which can only be pointing two ways you can call one way positive or forwards, and the other way negative or backwards. Speed is the absolute distance positive divided by absolute time positive. Velocity is relative distance end - start divided by time. So if you move towards the negative axis, "end" is smaller than "start" and the number you compute is negative.
When talking about velocity, we're not talking about scalar numbers. We're talking about vectors. If we choose a coordinate system and place your house at the point 0,0,0 and your workplace at 1,0,0 , and you travel from your house to your workplace at 1 unit per second, then your velocity is 1,0,0. If you travel from your workplace to your house at 1 unit per second, your velocity is -1,0,0.
Your conception of velocity seems to be the magnitude of velocity. If this helped you, you might consider accepting his answer little check mark.
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A vector is a pair of magnitude and direction, the length of it is positive by definition. Helder Velez Helder Velez 2, 17 17 silver badges 30 30 bronze badges. Featured on Meta.
Now live: A fully responsive profile. Linked Related 3. Hot Network Questions. If the object is speeding up then its acceleration vector is directed in the same direction as its motion in this case, a negative acceleration.
The dot diagram shows that each consecutive dot is not the same distance apart i. The position-time graph shows that the slope is changing meaning a changing velocity and negative meaning a negative velocity.
For the most part velocity is not zero if an object is accelerating. Since acceleration is the change in velocity over time, there has to be a change in velocity for something to accelerate. Yes, an object that was set in motion in the past by some force, but that is no longer being acted on by a net force, is moving but with zero acceleration, i. For example, a puck sliding along a horizontal plane of ice after being hit with a hockey stick. Explanation: If the bone does not move, then we know that the resultant acceleration on it is zero.
That means that the net force must also equal zero. In other words, the sum of the two forces acting on the bone must be zero. If a body is moving with constant velocity, acceleration is zero. So net force acting on it will be also zero.
But the body has energy due to its constant motion. So even if the body is moving with constant velocity, it can impart its momentum to other body.
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