A Levels Physics

Which quantity has the same base units as momentum?
A density x energy
B density x volume x velocity
C pressure x area
D weight + area


Choice B is correct because:

Base unit of momentum is kilogram meter per second (kgm/s).

Base unit of pressure is pascal (Pa), which is defined as Newton per square meter (N/m²) and can also be expressed as kilogram per meter per second squared (kg/(ms²)).

Base unit of area is square meter (m²).

If pressure (kg/(ms²)) and area are multiplied (m²), the resulting units are kilogram meter per second (kgm/s), which is the same as momentum.

Choices A, C, and D are incorrect because they do not have the same base units as momentum.

Physical Quantities and Units | 2012 - O/N - 9702/12 | Q1