Ex. → If a body is moving in a circular path with uniform speed, then it is said to be executing uniform circular motion. In other words, the movement of an object is known as the motion of the object. Sign of velocity represents the direction of motion of body. (iii) Oscillatory/Vibratory motion – To and fro path with respect to origin. Ex. this is your one stop solution. Distance never decreases with time. Very small objects like atoms and molecules and very large objects like planets, stars and galaxies are in motion.Thus, all objects ranging from the smallest atom to the largest galaxy are in continuous motion. (ii) The blades of a rotating ceiling fan, a person running around a circular track with constant speed etc. 1. are the example of variable velocity, as the direction of the moving body changes in each case. → For non-uniform motion, average speed will describe one single value of speed throughout the motion of the body. Describing Motion; Measuring the Rate of Motion; Rate of Change of Velocity; Graphical Representation of Motion; Equations of Motion by Graphical Method; Uniform Circular Motion; These solutions are part of NCERT Solutions for Class 9 Science. • Acceleration (a) = Change in velocity/Time = (v-u)/t, where, v = final velocity, u = initial velocity. To Study Describing Motion and Related Concepts Class 9 Notes | EduRev for Class 9 What will be the value of its retardation? From the given v-t graph, it can be inferred that the object is. PDF download of these motion class 9 numericals is also available. (c) … (ii) The motion of a train leaving or entering the platform. running on the road, Birds flying in the sky, Fish swimming in water. The arithmetic mean of initial velocity and final velocity for a given time period, is called average velocity. Describing Motion and Related Concepts Class 9 Notes | EduRev notes for Class 9 is made by best teachers who have written some of the best books of It can be positive (+ve), negative (-ve) or zero. → In such a motion the speed may be same throughout the motion but its velocity (which is tangential) is different at each and every point of its motion. Formulae Handbook for Class 9 Maths and Science Educational Loans in India. Calculate (i) the distance travelled by train and (ii) the magnitude of the displacement of the train on reaching station B. Sol. For example, if an object starts from rest and its velocity goes on increasing with time in the direction of its motion, then the object has positive acceleration. Total displacement divided by total time is called average velocity. NCERT Exemplar Class 9 Science is very important resource for students preparing for IX Board Examination. Distance can be equal to or greater than displacement, Displacement can be equal to or less than. Displacement can be equal to distance or its lesser than distance. i.e., final velocity will be ‘v’. Define retardation. → Deaceleration is seen in non-uniform motion during decrease in velocity with time. Oct 18, 2020 - Describing Motion and Related Concepts Class 9 Notes | EduRev is made by best teachers of Class 9. Studyrankers is a free educational platform for cbse k-12 students. For a moving body it is never zero. For example, if an object moving with certain velocity is brought to rest then the object is said to have negative acceleration. Distance travelled by object = Area of OABC (trapezium), = Area of OADC (rectangle) + Area of ∆ABD. (ii) Magnitude of the displacement in going from station A to station B = 400 km. Ex. NextGurukul Guest User. Ex. (i) An aeroplane flying at a speed of 600 km/h. (ii) An aeroplane flying due north-east with a speed of 600 km/h. Acceleration which opposes the motion of a body is called retardation or negative acceleration. Thus, uniform circular motion is an accelerated motion. → In this type of motion, the body will travel unequal distances in equal intervals of time. When a body undergoes equal changes in velocity in equal intervals of time, the body is said to be moving with a uniform acceleration. DIFFERENCES BETWEEN DISTANCE AND DISPLACEMENT. Understanding Motion Reference point and reference frame. → If a body is executing uniform motion, then there will be a constant speed or uniform motion. When a body covers equal distances in equal intervals of time however small may be time intervals, the body is said to describe a uniform motion. (i) Circulatory motion/Circular motion – In a circular path. • Average velocity = Total displacement/Total time. Average speed by an object (body) = 30 km/hr. (ii) The direction of motion of the body should not change. For a moving body it can be zero. Non-uniform acceleration or variable acceleration : When a body describes unequal change in velocity in equal intervals of time, the body is said to be moving with non-uniform acceleration. at point ‘A’ and this velocity changes to ‘v’ at point ‘B’ in ‘t’ secs. (ii) Motion of a simple pendulum. Final velocity = Initial velocity + Acceleration × Time. It is the shortest distance between two points which the body moves. Shortest length between initial point and far point of an object. In this page find physics numerical for class 9 motion with answers as per CBSE syllabus. Science . When a body covers equal distances in equal intervals of time however small may be time intervals, the body is said to describe a uniform motion.Example of uniform motion –, (i) An aeroplane flying at a speed of 600 km/h (ii) A train running at a speed of 120 km/h (iii) Light energy travelling at a speed of 3 × 108 m/s. person. The motion in animals is called LOCOMOTION. Class-IX . Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 9.. DISTANCE AND DISPLACEMENTDistance: The length of the actual path between the initial and the final position of a moving object in the given time interval is known as the distance travelled by the object. Define retardation. A train goes from station A to station B as shown in figure. a = o. using search above. Class 9. MOTIONIf we look around us, we find that there are number of objects which are in motion. (i) Distance travelled by the train = 50 + 100 + 200 + 400 = 750 km. (ii) A freely falling stone under the action of gravity. When a body covers equal distances in equal intervals of time, but its direction changes, then the body is said to be moving with variable velocity. Complete → It is the speed of a body in given direction. Example of non-uniform motion – (i) An aeroplane running on a runway before taking off. When a body covers unequal distances in equal intervals of time, the body is said to be moving with a nonuniform motion. (i) A car running towards north on a busy road has a variable velocity as the displacement covered by it per unit time changes with change in the road condition. In uniformly accelerated motion, there will be equal increase in velocity in equal interval of time throughout the motion of body.
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