Five different objects are formed from a constant volume V of different materials, and the objects are placed on various surfaces. Rank the following objects in order of increasing inertia: a cubic lead block on ice, a cubic plastic block on ice, a sphere of lead on ice, a pyramid of plastic on concrete, and a pyramid of lead on concrete. Rank from largest to smallest. To rank items as equivalent, overlap them. ▸ View Available Hint(s) GER

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”