![]() ![]() 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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