MCQ practice · SSC Physics Board questions · Chapter 3: Force
When we get down from a moving vehicle we stumble and fall, because of:
Think it through first, then pick an option.
- a static inertia
- b motion inertia
- c balanced force
- d unbalanced force
Answer and explanation
Correct answer: b motion inertia
When the feet touch the ground the lower body stops, but the upper body keeps moving by motion inertia, so we stumble.
Why the other options are wrong
- a static inertia: Static inertia is the tendency to stay at rest; here the body was already moving, so motion inertia acts.
- c balanced force: Balanced forces have zero resultant and cause no acceleration; the fall comes from the body keeping its motion.
- d unbalanced force: An unbalanced force does change velocity, but the book explains this fall by motion inertia: the upper body keeps its earlier motion.
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