Chapter 2: Motion in a Straight Line
Motion in a Straight Line (kinematics in one dimension) is where Class 11 Physics stops describing things and starts describing change. Built directly on the measurement discipline of Units and Measurements, this chapter defines distance and displacement, average and instantaneous velocity, acceleration, derives the three kinematic equations for uniformly accelerated motion, applies them to free fall, and closes with relative velocity. NTA tests it through x–t and v–t graph reading, kinematic numericals, the average-speed mean traps, free-fall Assertion–Reason items and relative-velocity integer questions. Work through the seven topic pages below in NCERT order, attempt the drill questions on each page, then take the 30-question chapter test with full answer key.
Topics in this chapter
- § 2.1 Distance and DisplacementDistance vs displacement for straight-line motion: position, path length, sign convention and x-t reading — solved examples and practice for JEE Main, NEET.
- § 2.2 Average Velocity and Average SpeedAverage velocity and average speed: definitions, chord-slope method, equal-time vs equal-distance means and the 48 km/h classic — JEE Main, NEET solved…
- § 2.3 Instantaneous Velocity and SpeedInstantaneous velocity and speed: the dx/dt limit, tangent slopes on position-time graphs and power-rule differentiation — JEE Main, NEET notes with examples.
- § 2.4 Acceleration in Straight Line MotionAcceleration in straight-line motion: average and instantaneous values, v-t slope reading and the speeding-up vs slowing-down sign logic — JEE Main, NEET…
- § 2.5 Kinematic Equations of MotionThe three kinematic equations derived step by step by calculus, plus the average-velocity form and the distance-in-nth-second formula — JEE Main, NEET notes.
- § 2.6 Free Fall and Motion Under GravityFree fall and motion under gravity: v = gt, h = ½gt², maximum height, time of flight and the v = 0 but a = 9.8 m s⁻² trap — JEE Main, NEET notes and practice.
- § 2.7 Relative VelocityRelative velocity in one dimension: v_AB = v_A − v_B, overtaking and head-on encounters, approach and separation speeds — JEE Main, NEET notes with examples.
- ✓ Chapter testAttempt all questions, then submit to see your score and the explanation for every answer.