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Q: Which of the following examples illustrates Newton first law of motion?
  • A. When we stop pedaling, the cycle starts to slow down.
  • B. While catching a fast approaching cricket ball, the fielder slowly moves his hand backwards with the moving ball.
  • C. When a bus starts abruptly, the passengers are jerked backwards.
  • D. Rocket launching
Correct Answer: Option C - Newton First Law of Motion - If an object is in rest position, it will remain in the rest position until an external force is applied on it. When the bus is not moving the passengers are in the state of rest and they have inertia of rest. When the bus starts moving suddenly, the lower part of the body of passengers, which is in contact with the bus, come in motion, but upper part of their body tends to be in the state of rest and the passengers fall backward or jerked backwards.
C. Newton First Law of Motion - If an object is in rest position, it will remain in the rest position until an external force is applied on it. When the bus is not moving the passengers are in the state of rest and they have inertia of rest. When the bus starts moving suddenly, the lower part of the body of passengers, which is in contact with the bus, come in motion, but upper part of their body tends to be in the state of rest and the passengers fall backward or jerked backwards.

Explanations:

Newton First Law of Motion - If an object is in rest position, it will remain in the rest position until an external force is applied on it. When the bus is not moving the passengers are in the state of rest and they have inertia of rest. When the bus starts moving suddenly, the lower part of the body of passengers, which is in contact with the bus, come in motion, but upper part of their body tends to be in the state of rest and the passengers fall backward or jerked backwards.