Question

a ketchup bottle is turned upside down and shaken. the ketchup initially stays at the bottom of the inverted bottle, then slowly starts moving. which statement best explains this behavior using newtons first law? a the ketchups inertia keeps it in place, and then gravity creates an unbalanced force, causing motion. b balanced forces keep the ketchup stationary, and then air pressure causes it to move. c the ketchups weight holds it in place, and then shaking creates balanced forces for motion. d unbalanced forces initially move the ketchup, then balanced forces keep it flowing.

Explanation:

Newton's First Law states that an object at rest stays at rest (due to inertia) unless an unbalanced force acts on it. Here, ketchup's inertia keeps it at the bottom (initial rest state). When the bottle is inverted and shaken, gravity (an unbalanced force) acts on the ketchup, causing it to move. Option A aligns with this principle. Options B and C mention balanced forces (which would keep the object at rest or in uniform motion, not explain the ketchup starting to move as described). Option D has incorrect force - motion logic (unbalanced forces cause motion, not the other way around as stated).

Answer:

A. The ketchup’s inertia keeps it in place, and then gravity creates an unbalanced force, causing motion.