Vehicle Rescue And Extrication Practice Test

The force exerted on an object by gravity is called what?

Weight Mass Density Volume

Correct Answer:

Weight

Explanation:

Weight is the gravitational force acting on an object's mass. It’s the force you must counter or support when lifting or stabilizing a vehicle. The relationship is Fg = m × g, where m is mass and g is the local acceleration due to gravity. On Earth, g is about 9.81 m/s², so a 100 kg object weighs roughly 980 Newtons. Mass stays the same regardless of location, but weight changes with gravity. Density and volume are not forces—they describe how much matter there is per space (density) and how much space the object takes up (volume). In rescue scenarios, understanding weight helps you plan lifting, cribbing, and stabilization because it tells you the actual downward force devices must manage.

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