Distinguish between speed and velocity for class 9

Teacher Support The learning objectives in this section will help your students master the following standards: • (4) Science concepts. The student knows and applies the laws governing motion in a variety of situations. The student is expected to: • (B) describe and analyze motion in one dimension using equations with the concepts of distance, displacement, speed, average velocity, instantaneous velocity, and acceleration. In addition, the High School Physics Laboratory Manual addresses content in this section in the lab titled: Position and Speed of an Object, as well as the following standards: • (4) Science concepts. The student knows and applies the laws governing motion in a variety of situations. The student is expected to: • (B) describe and analyze motion in one dimension using equations with the concepts of distance, displacement, speed, average velocity, instantaneous velocity, and acceleration. Section Key Terms Teacher Support In this section, students will apply what they have learned about distance and displacement to the concepts of speed and velocity. [BL] [OL] Before students read the section, ask them to give examples of ways they have heard the word speed used. Then ask them if they have heard the word velocity used. Explain that these words are often used interchangeably in everyday life, but their scientific definitions are different. Tell students that they will learn about these differences as they read the section. [AL] Explain to students that velo...

Speed Velocity Rate of change of distance with time Rate of change of displacement of a body with time Scalar quantity Vector quantity It indicates rapidity of object Along with rapidity, it indicates direction of a object When the body returns to its initial position, speed will not be zero When the body returns to its initial position, velocity can be zero Speed can never be negative It can either be negative or positive, sometimes zero

Just as distance and displacement have distinctly different meanings (despite their similarities), so do speed and velocity. Speed is a Velocity as a Vector Quantity Velocity is a Velocity is a vector quantity. As such, velocity is direction aware. When evaluating the velocity of an object, one must keep track of direction. It would not be enough to say that an object has a velocity of 55 mi/hr. One must include direction information in order to fully describe the velocity of the object. For instance, you must describe an object's velocity as being 55 mi/hr, east. This is one of the essential differences between speed and velocity. Speed is a scalar quantity and does not keep track of direction; velocity is a vector quantity and is direction aware. Determining the Direction of the Velocity Vector The task of describing the direction of the velocity vector is easy. The direction of the velocity vector is simply the same as the direction that an object is moving. It would not matter whether the object is speeding up or slowing down. If an object is moving rightwards, then its velocity is described as being rightwards. If an object is moving downwards, then its velocity is described as being downwards. So an airplane moving towards the west with a speed of 300 mi/hr has a velocity of 300 mi/hr, west. Note that speed has no direction (it is a scalar) and the velocity at any instant is simply the speed value with a direction. Calculating Average Speed and Average Velocity As an...

Let's say I wanted to travel a circular path, with my initial point being the same as my final point. Now, according to the formula, my velocity is disp./time. Right? That would give my velocity as zero since the displacement is zero. ( Remember, my start and end point are same) But with zero velocity, I wouldn't even move from my place! How is this even possible? Any help would be appreciated. Thanks! What is the answer to 10 fish in a tank? How do you solve the prisoner hat riddle? Can not fly but can swim? What has a face but Cannot smile? What has keys but no lock? What is start with T and ends with T? What goes in the water red? What house weighs the least? What has holes but can hold water? What gets bigger and bigger? What can fill a room? Who owns the crocodile? How do you write a logic puzzle? What type of puzzle is Einstein's riddle? What has 4 legs and 1 foot? What has 2 hand and a face? What have lots of eyes? What has a face and hands? What kind of room has no doors? Where is today before yesterday? What has feet and legs and? What word begins and ends with an E? What building has many stories? If I am holding a bee, what do I have in my eye? A sundial has the fewest moving parts of any timepiece. ... How can 8+8=4? If you have me, you want to share me. ... I am heavy and hard to pick up, but backwards I am not. ... A cowboy rides into town on Friday, stays for three days, and leaves on Friday. What makes this number unique 8549176320 brain teaser? Which puzzl...

Answer Speed Velocity The distance travelled by a moving object per unit time is called its speed. It does not have any direction. The distance travelled by moving an object in a particular direction per unit time is called its velocity. It has a unique direction. Speed is given by the relation: Velocity is given by the relation: It is a scalar quantity. It is a vector quantity. Popular Questions of Class 9 Science • Q:- Abdul, while driving to school, computes the average speed for his trip to be 20 km h -1. On his return trip along the same route, there is less traffic and the average speed is 40 km h -1. What is the average speed for Abdul’s trip? • Q:- An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half-way down. • Q:- A driver of a car travelling at 52 km h -1applies the brakes and accelerates uniformly in the opposite direction. The car stops in 5 s. Another driver going at 3 km h -1in another car applies his brakes slowly and stops in 10 s. On the same graph paper, plot the speed versus time graphs for the two cars. Which of the two cars travelled farther after the brakes were applied? • Q:- Fig 8.11 shows the distance-time graph of three objects A,B and C. Study the graph and answer the following questions: Fig. 8.11 (a) Which of the three is travelling the fastest? (b) Are all three ever at the same point on the road? (c) How far has C travell...

Average Speed and Average Velocity Before learning about average speed and average velocity, we must know the difference between distance and displacement. Distance is a scalar quantity which generally implies how much ground has been covered by the object. On the other hand, displacement is a vector quantity, and it is the shortest possible distance between the start and end point. Example: If a particle is moving in a circle, after one revolution, the distance will be the perimeter of the circle while the displacement would be zero. Now, let us see what speed and velocity actually are. Speed: Speed is a scalar quantity which means it has no direction. It denotes how fast an object is moving. If the speed of the particle is high it means the particle is moving fast and if it is low, Â it means the particle is moving slow. Velocity: Velocity is a vector quantity which means it has both magnitude and direction. It denotes the rate at which the object is moving or changing position. The direction of the velocity vector is easy to find. Its direction is the same as the direction of the moving object. Even if the object is slowing down and the magnitude of velocity is decreasing, its direction would still be the same as the direction in which the object is moving Read More: The below video provides the Top 10 NTSE Important Questions on Motion Class 9 \(\begin \) Now, let us look at some of the examples to understand this concept easily 1.) In travelling from Pune to Nagpur, R...

Difference between Speed and Velocity Difference between speed and velocity is one of the most interesting topics in Physics. The difference between speed and velocity is also a very common question asked in board exams and competitive entrance exams like JEE and NEET. We use the terms speed and velocity in everyday usage, but it does not mean very different to us. But when it comes to Mathematics and Physics, the two terms are completely different from each other. The difference between speed and velocity in tabular form is provided here so that students can understand the concepts of speed and velocity in a better way. Before learning the difference between speed and velocity, students must understand the concepts and properties of speed and velocity properly. The difference between speed and velocity, with examples, is given in the table below. Difference Between Speed And Velocity Sl. No. Differentiating Property Velocity Speed 1 Definition • Velocity can be defined as the rate at which an object changes position in a certain direction. • The rate at which an object covers a certain distance is known as speed. 2 Type of quantity • Vector quantity • Scalar quantity 3 Magnitude • Velocity can be zero, negative, or positive. • Speed can never be negative or zero. 4 Change of direction • The velocity of the object changes with the change in direction, therefore the object must follow one direction. • The average speed will continue to count even if the object changes direc...