NCERT Class 9 Science — Chapter 1: Motion

With reference to non-uniform acceleration, consider the following statements: 1. It occurs when velocity changes by unequal amounts in equal intervals of time. 2. A car increasing its speed by equal amounts in equal intervals of time is an example of non-uniform acceleration. 3. Free fall of a body is an example of non-uniform acceleration. Which of the statements given above is/are correct?

In a hammer throw event, the hammer moves along a straight line tangential to the circular path upon release. This is because:

With reference to the description of motion, consider the following statements: 1. The position of an object is described by specifying a reference point known as the origin. 2. An object's state of motion is absolute and independent of the observer. 3. Motion is inferred through the change in position of an object over time. Which of the statements given above are correct?

Consider the following statements regarding 'distance' and 'displacement': 1. Distance is a vector quantity requiring both magnitude and direction. 2. Displacement is the shortest distance measured from the initial to the final position of an object. 3. The magnitude of displacement is equal to distance when motion is in a straight line. Which of the statements given above is/are correct?

Under which condition is the displacement of a moving object zero, despite the distance travelled being non-zero?