Newton's first law of motion, also known as the Law of Inertia, states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. When the bus is stationary, you are also at rest relative to the ground. When the bus suddenly accelerates forward, your body, due to inertia, tends to maintain its state of rest. This relative motion causes you to feel a backward jerk with respect to the accelerating bus.
The explanation of, why we get thrown back with a jerk when the stationary bus we are sitting in starts moving forward is given by :
Asked in UPSC CAPF 2009 · Topic: Mechanics (Newton's Laws of Motion and their applications)
More Physics questions
- A person moves along a circular path by a distance equal to half the circumference in a given time. The ratio of his average speed to his average velocity is :
- The following figure shows the displacement time (x-t) graph of a body in motion. The ratio of the speed in first second and that in next two seconds is :
- The Earth travels on its orbit at a speed of approximately 4400 km per hour. Why do we not feel this high speed ?
- To start your loaded trolley bag, you exert more force than when it is moving. This is an example of
- A piece of stone tied to a string is made to revolve in a circular orbit of radius r with other end of the string as the centre. If the string breaks, the stone will :
- Which one of the following statements is not true ?
- Which one of the following statements with regard to Newton’s third law of motion is NOT correct?
- Ball bearings are used in bicycles, cars, etc., because
