# cbse class 9 physics motion notes

Example: A train running at a speed of 90 km/hr. When d-t graph is straight line not parallel. ((w.adpushup = w.adpushup || {}).control = (w.adpushup.control || [])).push(k); motion as there is continuous change velocity with time. You all must have played with the instrument guitar. Time is the duration of an event that is expressed in seconds. Example: A passenger inside a bus sees the other passengers be at rest, whereas an observer outside the bus sees the passengers are in motion. When velocity undergoes unequal changes in equal intervals of time and the direction may not be a straight line, Example: Body moving with variable velocity. Like we took so many examples above so, in any example if we plot distance versus time we get the important information from it. For Example: If you travel to Delhi to your relative’s place and if someone asks you about the distance what do you reply. Speed: Distance travelled by the object in unit time. Here the direction of motion is specified. Distance-Time graphs show the change in position of an object with respect to time. To know more about Uniform Circular Motion, visit here. A trolley while going down an inclined plane has an acceleration of 2cm/sec 2.. What will be its velocity 3seconds after the start? It is a vector quantity. A train starting from railway station and moving with uniform acceleration attains the speed of 40km/hr in 10 minutes find acceleration? So, the information that we get, is: S= area of rectangle Q. Which of the two travels farther after the brakes are applied? Speed & Velocity. So, the information we get: Like we took so many examples above so, in any example if we plot velocity versus time, then we get the important information from it. • Motion: A body is said to be in a state of motion when its position change continuously with reference to a point. From the graph BD = v (final velocity) – DC = u (initial velocity)…………..(eq 1). Given here is the complete explanation of the chapter, along with all the important questions and NCERT solutions to book questions have also been provided for the ease of students. A bus starting from rest moves with uniform acceleration of 0.1m/sec2 for 2 minutes. Q. : Q. If so support your answer with example? Let’s take an example suppose we are travelling to Delhi and we are covering the same distance like in each hour we cover 60 km in specified direction then the body is said to be travelling with uniform velocity. Latest Entrance Exams, Admission info. This is all due to speed which actually means how much distance we are covering in given time. To know more about motion or rest we should first get familiar with the term reference point or stationary object. Your No1 source for Ans. If a body covers a certain distance in a certain amount of time, its speed is given by, Average speed = Total distance travelled / Total time taken. What does the odometer measure? Now ram has to go to Geeta’s place but he doesn’t know the house so what he plans He first went to Shyam place and then with shyam he went to Geeta’s home. To describe the position of an object we need a reference point or origin. Velocity =  $$\frac{Displacement}{Time}$$. Is defined as the rate of change of velocity with time. Let’s say there were 3 friends Ram, Shyam and Geeta. It can be zero: whenever a body starts from one point and returns to the same point the displacement is zero. You all use common things around you that are moving like if you see around you, observe air moving around you, like you have clocks with the hands moving, you all know that day and night is caused because of motion of Earth around the Sun, even seasons are caused because of it. Body is moving with uniform velocity but not starting from rest . Q. Q 1. Ans. E.g: Velocity, displacement, weight, momentum, force, acceleration, etc. You all know the earth rotates on its axis which causes day and night that movement is rotational motion because it is rotating on its axis so, we can define as the rotational motion when the body rotates about a fixed axis. The magnitude of the length covered by a moving object is called distance. CBSE Class 9 Science Chapter 8 Motion, Explanation, Examples, Question Answers. Q. Therefore, we can say that they are rotating with non-uniform velocity. Speed of any object can also be measured at any instant of time with the help of speedometer, whereas. The speed time graph shown for the car is shown in figure: A farmer is moving along a boundary of square field of side 10 m in 40 seconds. Q. This shows the distance covered is directly proportional to time that shows body is moving with [uniform speed] A body starts with some initial non-zero velocity at A and goes to B  with constant acceleration a, Area under the graph gives Displacement =A(ΔABD)+A(□OADC)=($$\frac{1}{2}$$AD×BD)+OA×OC ……………(eq 1), Substituting in (eq 1) we get s= $$ut + \frac{1}{2}at^{2}$$. How far does the boat travel during this time?

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