To quantitatively understand the effect of a Force, we need to understand the concept of momentum. The momentum of an object is defined as the product of its mass and velocity, Momentum $$\vec{p} = m \vec{v}$$. Because velocity is a vector quantity, momentum is also a vector.
If a lorry of mass $$500 \, \mathrm{kg}$$ is travelling at $$8 \, \mathrm{m/s}$$, what is the magnitude of its momentum in SI units?
• $$\frac{500}{8}$$
• $$500 + 8$$
• $$500 \times 8$$
• $$500 - 8$$