Unit Motion PDF

Linear and circular Motion  1) Recollect the requirement of unit system in physics. 2) Learn the fundamental units in Physics. 3) Learn the conversion factors of different units. 4) Learn the scale factors like kilo, micro, milli, nano, etc....

Linear and circular Motion  1) Recollect the requirement of unit system in physics. 2) Learn the fundamental units in Physics. 3) Learn the conversion factors of different units. 4) Learn the scale factors like kilo, micro, milli, nano, etc. 5) Understand accuracy, precision and resolution of an Learning instrument. 6) Learn the concept of position. 7) Learn the difference between displacement and distance. outcomes 8) Calculate velocity and acceleration in a linear motion. 9) Understand the angular motion. 10) Express angular velocity in terms of equation. 11) Infer the relation between the linear velocity and angular velocity. 12) Differentiate frequency and period of circular motion. 13) Relate the circular motion with the working principle of a Centrifuge.  Fundamental Physical Quantities Derived Units: m/s, N, Pa, J, etc Length scale comparison  The largest known living creature is the blue whale, which has an average length of 70 ft. The largest blue whale on Let's Do it!!! record was 1.10 × 102 ft long. (a) Convert this length to meters. (b) If a double-decker London bus is 8.0 m long, how many double-decker-bus lengths is the record whale?  Accuracy, Precision, and Resolution Accuracy refers to how closely the measured value corresponds to the true value. Precision refers to how closely the results of multiple measurements taken with the same instrument agree with each other. Resolution refers to the smallest change in value that the instrument can detect or display. Linear motion  Position and Displacement To get Position, the reference point, the distance, or the direction are required Displacement Versus Distance The magnitude of the displacement is not necessarily equal to the distance traveled. Velocity Rate of change of position Unit – m/s Instantaneous velocity is commonly using in the Physics  Find the average velocity in kilometers per hour of the train shown in Fig. 2.1 Let's Do it!!! during the time interval between 3:14 p.m., when the train is 3 km east of the origin, and 3:56 p.m., when it is 26 km west of the origin. Acceleration Rate of change of velocity In everyday language, it usually means “an increase in speed.” Unit – m/s2 Instantaneous acceleration is commonly using in the Physics Circular Motion  Uniform circular motion The sign of the angular displacement indicates the sense of the rotation. ‘+’ means Counterclockwise ‘−’ means Clockwise means Clockwise Angular Displacement and Angular Velocity Radian Measure: Common unit of angle is degree, but the SI unit is Radian The conversion between degrees and Θ (in rad)=Arc/radius radians is, The angle shown is, 1 rad ≈ 57.3°. 360° = 2π rad Relation Between Linear and Angular Speed The linear distance travelled (for a radius r) along the circular path during an angular displacement of Δθ (in radians) is the arc length s The linear Velocity is, Period and Frequency Period: The time for the point to travel completely around the circle, T. Frequency: The number of revolutions per unit time, is defined as the reciprocal of the period, f. Unit: hertz (Hz) Centrifuge Centrifuge is a device, that puts an object in a rotational movement around a fixed axis that helps to separate mixtures by applying centrifugal force. A centrifuge works by using the principle of sedimentation: Under the influence of gravitational force (g-force), substances separate according to their density.