But the inertia of the passengers is still towards the straight direction. What will happen to the passengers sitting inside the bus?Ĭlarification: When the bus takes a sharp right turn, the inertia of the bus changes. A straight moving bus takes a sharp right turn. When the car suddenly moves the inertia of the car changes but not that of the ball. In the following figure, what will happen to the ball hanging from the roof of the car if the car suddenly moves towards left (direction shown by arrow)?Ĭlarification: Since the system was initially at rest, the inertia of the ball is that of rest. But the inertia of the people still remains that of rest. When the car starts, the inertia of the car changes from that of rest to that of motion. Hence, they were having an inertia of rest. This is because, while the car was stationary, the people were stationary with it. This is due to _Ĭlarification: When the car starts, the people sitting in it experience a jerk. Passengers sitting in a stationary car experience a jerk when the car suddenly starts. But the inertia of the people still remains that of motion.

When the bus stops, the inertia of the bus changes from that of motion to that of rest. Hence, they were having an inertia of motion. This is because, while the bus was moving, the people were moving with it. This is due to _Ĭlarification: When the bus stops, the people sitting in it experience a jerk. People sitting in a moving bus experience a jerk when the bus stops. This is also known as the law of inertia.Ģ.

What causes the motion of a body which is initially in the state of rest?Ĭlarification: The first law of motion states that a body remains in the state of motion or in the state of rest until and unless an external force is applied on it. Physics Multiple Choice Questions on “Newton’s First Law of Motion”.ġ.

First law of motion