Vectors or scalars? directions, weights, volumes, tensile forces, etc

[mcarthyryan]

Hi,

I'm not fully understanding some vector examples. I have two incorrect in the following examples, and I think one of them I have marked as a scalar is a zero vector? But I'm not sure which other one is incorrect?

I know that:
Vectors need two elements, magnitude and direction. Except for a zero vector.
Scalars have quantities, but no direction.

So I chose the following answers, but two aren't correct, and I don't know why?




Thank you

 

[Deleted member 4993]

Hi,

I'm not fully understanding some vector examples. I have two incorrect in the following examples, and I think one of them I have marked as a scalar is a zero vector? But I'm not sure which other one is incorrect?

I know that:
Vectors need two elements, magnitude and direction. Except for a zero vector.
Scalars have quantities, but no direction.

So I chose the following answers, but two aren't correct, and I don't know why?




Thank you

A zero vector has magnitude of 0 - but - distance of 38 m has a magnitude (only) of '38'.

A tensile force is a vector.

 

[Harry_the_cat]

Hi,

I'm not fully understanding some vector examples. I have two incorrect in the following examples, and I think one of them I have marked as a scalar is a zero vector? But I'm not sure which other one is incorrect?

I know that:
Vectors need two elements, magnitude and direction. Except for a zero vector.
Scalars have quantities, but no direction.

So I chose the following answers, but two aren't correct, and I don't know why?




Thank you

The first one is a scalar. It has magnitude but no direction.

Forces are vectors as they have mag and direction. So Weight (force due to gravity ...downwards) is a vector. The tensile force is also a vector.

 

[mcarthyryan]

Hi both,

Thank you for your reply.

I understand now, I didn't realise forces and weight were vectors, but it makes sense now, as they have a direction as such.



Thank you.