1.1 Dimensional Analysis and 1.2 Scalars and Vectors

[MLT⁻²] is the dimensional formula of

• force

• coefficient of friction

• Energy

• work done

Which of the following physical quantity is dimensionless?

• Presure

• Area

• stress

• strain

Dimension analysis is a

• measuring device

• quantity

• method used to check mathematical relation for the consistency of their dimensions based on Principle of homogeneity.

• unit of a substance

Dimension is defined as

• A method which physical quantity expressed in terms of scalar and vector quantity.

• A technique which physical quantity can be expressed in terms of combination of basic quantities.

• A technique which physical quantity can be expressed in terms of combination of derived quantities.

• A method which physical quantity expressed in terms of vector quantity.

____________ is an example of a scalar quantity

• velocity

• force

• acceleration

• volume

_____________ is an example of a vector quantity

• mass

• force

• volume

• density

A scalar quantity

• does not have units

• shows direction

• is a quantity that is completely by its magnitude

• always has mass

A vector quantity

• can be a dimensionless quantity

• specifies only magnitude

• specifies only direction

• specifies both a magnitude and a direction

The difference between speed and velocity is _________

• speed has no units

• speed shows only magnitude, while velocity represents both magnitude and direction.

• they use different units to represent their magnitude

• velocity has a higher magnitude