Line To Line Full/Complete, Proper, Deep, Detailed & Easy Explanation With Examples & Analogy In Hinglish/Hindi/English Language Of CONCEPTS LIKE :
• Motion of an object
• Displacement and distance
• Speed and velocity
• Effect of speed and direction on velocity
• Uniform and non-uniform linear motion
• Acceleration
• Positive, negative and zero acceleration
• Distance-time graph for uniform motion
• Distance-time graph for non-uniform motion
• Velocity-time graph for
uniform velocity
• Velocity-time graph for uniform acceleration
• Equations of motion using graphical method
• Equation describing the relation between velocity and time
• Equation describing the relation between displacement and time
• Equation describing the relation between displacement and velocity
• Uniform circular motion
• Determining the direction of velocity in uniform circular motion
• Newton’s laws of motion
• Newton’s first law of motion
• Balanced and unbalanced force
• Newton’s second law of motion
• Momentum (P)
• Newton’s third law of motion
• Law of conservation of momentum
& Activities like :
+ LET'S RECALL
+ CAN YOU RECALL ?
• What are vectors and scalars?
• Which of the quantities distance, speed, velocity, time and displacement are scalars and which are vectors?
+ USE YOUR BRAIN POWER !
• Sheetal first went to her friend Sangeeta’s house on her way to school (see figure 1.1b).
• Prashant went straight from home to school. Both are walking with the same speed.
• Who will take less time to reach the school and why?
• If a car, starting from point P, goes to point Q (see figure 1.2 b) and then returns to point P, how much distance has it travelled and what is its displacement?
• Every morning, Swaralee walks round the edge of a circular field having a radius of 100 m. As shown in figure 1.2 (a), if she starts from the point A and takes one round, how much distance has she walked and what is her displacement?
• What is the time interval between the notings of distances made by Amar, Akbar and Anthony?
• Who has covered equal distances in equal time intervals?
• Are all the distances covered by Akbar in the fixed time intervals the same?
• Considering the distances covered by Amar, Akbar and Anthony in fixed time intervals, what can you say about their speeds?
• If the velocity changes by equal amounts in equal time intervals, the object is said to be in uniform acceleration.
• If the velocity changes by unequal amounts in equal time intervals, the object is say to be non-uniform acceleration.
• In the distance-time graph above, what does the slope of the straight line indicate?
• What difference do you see in the distance-time graphs for uniform and non-uniform motion?
• Why is there a thick bed of sand for a high jumper to fall on after his jump?
• While hitting a ball with a bat, the speed of the bat decreases.
• A gun recoils i.e. moves backwards when a bullet is fired.
• Mechanism of firing of a rocket.
• How will you explain these with the help of Newton’s third law of motion?
+ DO YOU KNOW ?
+ CAN YOU TELL ?
• In which of the following examples can you sense motion? How will you explain presence and absence of motion?
+ OBSERVE AND DISCUSS
+ THINK ABOUT IT
• You are travelling in a bus. Is the person sitting next to you in motion?
• What do you take into consideration to decide if an object is moving or not?
• If you increase the number of sides of the polygon and make it infinite, how many times will you have to change the direction? What will be the shape of the path?
+ ALWAYS REMEMBER
• About Speed & Velocity
• Galileo
+ TRY THIS
+ COMPLETE THE TABLE
+ GREAT SCIENTISTS
+ LET'S TRY
+ TABLE
+ SOLVED EXAMPLESEXAMPLES
• An athlete is running on a circular track. He runs a distance of 400 m in 25 s before returning to his original position. What is his average speed and velocity?
• An aeroplane taxies on the runway for 30 s with an acceleration of 3.2 m/s2 before taking off. How much distance would it have covered on the runway?
• A kangaroo can jump 2.5 m vertically. What must be the initial velocity of the kangaroo?
• A motorboat starts from rest and moves with uniform acceleration. If it attains the velocity of 15 m/s in 5 s, calculate the acceleration and the distance travelled in that time.
• The mass of a cannon is 500 kg and it recoils with a speed of 0.25 m/s. What is the momentum of the cannon?
• 2 balls have masses of 50 gm and 100 gm respectively and they are moving along the same line in the same direction with velocities of 3 m/s and 1.5 m/s respectively. They collide with each other and after the collision, the first ball moves with a velocity of 2.5 m/s. Calculate the velocity of the other ball after collision.
+ RESEARCH
• Find out more examples of circular motion in day to day life.
Of Lesson/Chapter no 1. Laws of Motion Std/Class 9 Science Maharashtra State Board Textbook & Many More Have Also Being Included In This One Shot Video Lecture Of New Academic Year 2024-25 In Simple Terms/Language.