Question

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Answer 1

Answer:

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Answer 2

Answer:

We need to separate different components of a mixture to separate the useful components from the non-useful or some harmful components.

Our elbow cannot move back because it has a hinge joint which allows the movement in one plane only.

A blacksmith heats the metal rim to fix it onto a cart wheel because a metal rim is made slightly smaller. On heating, the rim expands and fits onto the wheel. Then on cooling, the rim contracts and fits tightly onto the wheel.

A blacksmith heats the metal rim to fix it onto a cart wheel because a metal rim is made slightly smaller. On heating, the rim expands and fits onto the wheel. Then on cooling, the rim contracts and fits tightly onto the wheel.

We need to group materials for our convenience and to study their properties.