Motion in a Straight Line ā Class 11 CBSE Physics revision notes
A 6-page visual revision sheet for Motion in a Straight Line, written for Class 11 CBSE Physics. Formulas, diagrams and the traps that cost marks, laid out to be read the night before rather than the term before. Free, and it opens inside CapCompass.
Page 1 as PDF
Motion in a Straight Line in one look
one axis, three quantities, four equations
- Position: where you are, with sign
- Velocity: how fast x changes
- Acceleration: how fast v changes
Position, path length and displacement
- position x: measured from a chosen origin O along the x-axis, its sign gives the side
- path length: the total distance covered along the actual path; a scalar, never negative
- displacement: Ī x = x_f - x_i, the change in position, sign and all
- |Ī x| ā¤ path length, equal only if the motion never turns back
- a round trip: displacement zero, path length not
Moving the origin
- positions x_i and x_f change when O moves
- displacement x_f - x_i does not: it belongs to the motion
Velocity and speed
- average velocity: v = Ī x/Ī t, the slope of the chord on x-t
- average speed = path length/time, never less than |v|
- shrink Ī t to zero: the chord turns into the tangent
- instantaneous velocity v = dx/dt, the slope of that tangent
- instantaneous speed is |v|: over a vanishing interval, path length = |Ī x|
Page 1 of 6. The full sheet, all 6 pages, opens free in the app.
What this Motion in a Straight Line sheet covers
- Position
- Velocity
- Acceleration
- distance
- frame of reference
- Position, path length and displacement
- Moving the origin
- average speed
- instantaneous speed
- Velocity and speed
- Reading an x-t graph
- Velocity has a sign, speed does not
- The v-t graph: slope and area
- The three graphs at a glance
- Equations of motion, constant a only
- velocity after time t
- displacement in time t
- no time in it
- average velocity form
- distance in the nth second
- Where they come from: the v-t graph
- Equations of motion: special cases
- Stopping distance
- Reaction time
- Galileo's law of odd numbers
- Free fall, g = 9.8 m/sĀ² down
- with up positive
- dropped from height h, lands in
- speed on landing
- thrown up at u, max height
- time to the top
- up and back to the hand
- Up and back
- The feather and the coin
- relative motion
- Relative velocity in one dimension
- velocity of B as seen from A
- and of A as seen from B
- head on, closing speed
- same direction, closing speed
- Head on
- Overtaking
- Seen from car A
- When a is not constant
- a given as a(t)
- a given as a(x)
- a given as a(v)
- Symbols and units
- Traps that cost marks
- Tricks that save time
How CapCompass uses this sheet
These notes are not a standalone PDF. CapCompass plans Physics chapter by chapter against your real exam dates and free hours, and when the plan reaches Motion in a Straight Line the sheet opens inside the study block itself ā at the page covering the sub-topic that block is on, with the timer still running. Revision arrives at the moment the plan says revise, instead of having to be gone looking for.