Why and how does negative velocity exist? - Physics Stack Exchange
2015年6月15日 · A vector points in a direction in the given space. A negative vector (or more precisely "the negative of a vector") simply points the opposite way. If I drive from home to …
Why is gravity considered a negative vector in a pendulum question?
2020年11月15日 · According to this system, we take any vector directed downward and leftward to be negative, and any vector directed upward or rightward to be positive. The signs …
What does it mean if the dot product of two vectors is negative?
2018年7月27日 · In vector notation this can be written as $3\hat x \cdot 2 \hat x = (3 \times 2) (\hat x \cdot \hat x) = 6$. In which there is an ordinary multiplication (scaling) and a dot product, …
homework and exercises - What does negative means in terms of …
2018年9月3日 · Positive and negative depends on your chosen coordinate system. When you choose a direction to be "positive", you're choosing a coordinate system. Acceleration is the …
Can electric field be negative? - Physics Stack Exchange
2018年3月6日 · And so, a negative vector - or more precisely: the negative of a vector - has been defined to mean: The same vector in the opposite direction. Now that we have a chosen …
vectors - Why can scalars have a sign? - Physics Stack Exchange
2015年9月18日 · A negative value for a scalar does not imply a direction in space. Temperature can be negative, but temperature doesn't have a direction in space. A circuit can have a …
Can magnitude be negative? - Physics Stack Exchange
2019年1月23日 · That number may be positive or negative. In contrast, a vector quantity cannot be described using only one number per point in space. In 3-d space, we need 3 numbers per …
Negative vectors (e.g. velocity) - Physics Stack Exchange
2016年5月29日 · Their first and only component may be positive or negative, so one may also talk about positive and negative vectors. Of course, this is not possible for higher-dimensional …
What does it mean when vector quantity is negative?
2024年7月11日 · I’ve seen in some problems that vector quantity is negative. For example, negative Coulomb means that two charges attract… negative acceleration means that object …
Does a magnitude of a vector always have to be non-negative?
2019年4月14日 · A vector is a quantity described by a magnitude and a direction. The magnitude is always +ve or zero. A -ve sign in front of a vector indicates the same magnitude but in the …