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How is momentum affected and how can it be calculated?

What is the law of conservation of momentum?

Objects at rest are at zero momentum. Why is the total momentum after an explosion zero?

Why are side impact bars and crumple zones built into cars?

Why are seat belts and air bags built into cars?

What happens when two electrically insulating materials are rubbed together?

What happens if two negatively charged objects are brought close together?

How is current and potential difference measured?

What is resistance and what is ?

What is Ohms Law?