Kinematics is the study of the motion of an object without discussing the cause of motion. Question No.14: What is meant by Kinematics?Īns. Negative acceleration: Acceleration of a body is negative if the velocity of the body decreases with time is called negative acceleration. Positive acceleration: Acceleration of a body is positive if its velocity increases with time, is called positive acceleration. Question No.13: What is meant by positive acceleration and negative acceleration. Acceleration is defined as the rate of change of velocity of a body. The shape of the velocity-time graph is zigzag when the body has variable speed. What would be the shape of the speed-time graph of moving with variable speed?Īns. Vector: A vector quantity is described completely by magnitude and direction. A scalar quantity is described completely by its magnitude only. Differentiate between scalar and vector.Īns. The uniform circular motion is an example of a body which moves with constant speed. Can a body moving at a constant speed have acceleration?Īns. Random motion: The disordered or irregular motion of an object is called random motion. Linear motion: Straight line motion of a body is known as its linear motion. Questions No.8 Differentiate between linear and random motion.Īns. The length of its straight line represents the magnitude and arrow-head shows the direction of the vector. Graphically, A vector quantity is represented by a straight line, with arrow-head at it one end. How can vectorquantities be represented graphically.Īns. A vector quantity is described completely by its magnitude and direction. Question No.6 Define vector and write the name of two vector quantities.Īns. Velocity: A body has uniform speed if it covers equal distances in equal distances in equal intervals of time however short the interval may be. Speed: The distance covered by an object in unit time is called its speed. Question No.5 Differentiate between speed and velocity.Īns. The spinning motion of a body about its axis is called its rotatory motion. Define rotatory motion and give an example.Īns. The disordered or irregular motion of an object is called random motion. The shape of the velocity-time graph in zigzag when the body was variable speed. The velocity of the car after 5s is 20 mS-¹ Question No.2 What would be the shape of a speed-time graph of a body moving with variable speed?Īns. You may also Like: Short Questions of Chapter 1 – Short Questions of Chapter 3 Q.1: A car travelling at 10 mS-¹ accelerates uniformly at 2mS-². Kinematics: Physics Chapter 2 Short Questions for Class 9
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