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## Can a scalar be negative?

Now, as the real numbers include both, positive numbers as well as negative numbers, a scalar can be negative. Energy can take both, positive as well as negative values. So, now you can comment on scalar that it can be negative. Therefore, a scalar can be negative.

### What does a negative scalar do to a vector?

A scalar can only reverse the direction of a vector (i.e. by multiplying the vector by a negative scalar) but it cannot change the angle other than 180 degrees.

#### Is scalar quantity always positive?

They have both magnitude and direction. They have magnitude only. The sum of vectors may be zero, positive and negative. The sum of scalars is a positive number….Velocity.

Speed | Velocity |
---|---|

It is scalar quantity. | It is a vector quantity. |

It is always positive. | It can be positive, negative or zero. |

**What does a negative sign in front of a scalar mean?**

In case of scalar quantities, the + and − signs merely indicate the respective positiveness and negativeness of the associated number/magnitude of the scalar. An example: The temperature at a place can be 5∘C and again −5∘C. However, for scalar quantities like mass, length; negative numbers do not have physical sense.

**What is scalar sign?**

The sign of a scalar is a matter of convention determined by how the scale is defined and numbered. Most scales do not include negative numbers because it would make computation confusing. However, scalars also exist as the dot product of vectors.

## Can scalar multiple be negative?

Scalar multiplication by a positive number other than 1 changes the magnitude of the vector but not its direction. Scalar multiplication by any other negative number both reverses the direction of the vector and changes its magnitude.

### What happens when a vector is negative?

What is the Negative of a Vector? Vectors having the same length as a particular vector but in the opposite direction are called negative vectors. A negative sign will reverse the direction of a vector and make it a negative vector.

#### Can scalars be zero?

Yes, zero is a scalar.

**Is scalar positive or negative?**

A scalar is simply a number and can be either positive or negative. You may be confusing this with the “length” of a vector which is never negative. The length is a number and so is a scalar.