Mechanical Engineering Fundamentals: Vector Quantities

Mass (m): Amount of matter, constant.

Example: 60 kg (remains constant regardless of location)

Weight (W): Force due to gravity, varies with location.

Weight on Earth:
W = m × gₑ
W = 60 kg × 9.81 m/s²
W = 589 N

Weight on Moon:
W = m × gₘ
W = 60 kg × 1.62 m/s²
W = 97.2 N