The shortest distance covered by an object during the travel, in other words, the minimum distance from the initial point and final point during the journey of an object.Īverage Speed. The distance is the total distance covered by an object during its travel in a given time.ĭisplacement. According to the state of motions, it is of two kinds (i) Uniform Motion (ii) Non-Uniform Motion.ĭistance. When anything changes its position with respect to time then we say that the thing is in motion. The displacement covered by Mohan = 13 km Triangle ΔABC is the right triangle in which ∠B is the right angle
The displacement is = shortest distance = AC The distance covered covered by Mohan is = 12 + 5 =17 km Mohan went 12 km west from his house and then turned 5 km towards the north, show the displacement and the distance covered by him. Displacement is the vector quantity since it represented by direction and magnitude. The shortest distance between the initial and final position of an object during its journey is known as displacement. NCERT Solutions Class 10 Science from chapter 1 to 16ĭisplacement. The distance is a scalar quantity since it is represented by a magnitude only. The total distance covered by an object during its journey is known as distance. Before we study in detail what is average speed and average velocity, we are needed to study first what are distance and displacement.ĭistance. The average velocity and average speed both are very important in Dynamics or Kinematics in the calculation of net energy. The average speed is the total distance covered per unit time and the average velocity is total displacement covered in per unit time is known as average velocity. The relationship between total distance, time and average speed is, the total distance is the product of total time taken and average speed. (Average speed is not the magnitude of the average velocity.) Speed is a scalar quantity it has no direction associated with it.Average speed and average velocity-The The speed is defined as the distance per unit time and average speed is defined as total distance covered in per unit of total time or the average rate of covering the total distance. Average speed is the total distance traveled divided by the elapsed time.Instantaneous speed is a scalar quantity, as it has no direction specified.Instantaneous speed is the magnitude of the instantaneous velocity.Instantaneous velocity \(v\) is the velocity at a specific instant or the average velocity for an infinitesimal interval.Velocity is a vector and thus has a direction.the symbol \(t\) is used for elapsed time unless otherwise specified (\(Δt=t_f≡t\)).motion starts at time equal to zero (\(t_0=0\)).If we were using a stopwatch, it would simply read zero at the start of the lecture and 50 min at the end. Life is simpler if the beginning time \(t_0\) is taken to be zero, as when we use a stopwatch. (As usual, the delta symbol, \(Δ\), means the change in the quantity that follows it.) Where \(Δt\) is the change in time or elapsed time, \(t_f\) is the time at the end of the motion, and \(t_0\) is the time at the beginning of the motion. Elapsed time \(Δt\) is the difference between the ending time and beginning time,
and end at 11:50 A.M., so that the elapsed time would be 50 min. For example, a lecture may start at 11:00 A.M. To find elapsed time, we note the time at the beginning and end of the motion and subtract the two. How does time relate to motion? We are usually interested in elapsed time for a particular motion, such as how long it takes an airplane passenger to get from his seat to the back of the plane. This allows us to not only measure the amount of time, but also to determine a sequence of events. We could then use the pendulum to measure time by counting its swings or, of course, by connecting the pendulum to a clock mechanism that registers time on a dial.
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We might, for example, observe that a certain pendulum makes one full swing every 0.75 s. The SI unit for time is the second, abbreviated s. The amount of time or change is calibrated by comparison with a standard.
It is impossible to know that time has passed unless something changes. In physics, the definition of time is simple- time is change, or the interval over which change occurs. It may be a number on a digital clock, a heartbeat, or the position of the Sun in the sky. Every measurement of time involves measuring a change in some physical quantity. As discussed in Physical Quantities and Units, the most fundamental physical quantities are defined by how they are measured.
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