Motion in a Straight Line
ICSE · Class 11 · Physics
Quick revision notes for Motion in a Straight Line — ICSE Class 11 Physics. Key concepts, formulas, and definitions for last-minute revision.
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Key Topics to Revise
1. Frame of Reference and Nature of Motion
- A frame of reference is an arbitrary reference system with respect to which position and time coordinates of an event are assigned.
- An inertial reference frame is one in which Newton's first law correctly describes motion when no net external force acts on a body.
- A non-inertial reference frame is accelerated or rotating.
2. Distance and Displacement
- Distance is the length of the actual path covered by a body in a time interval.
- Displacement is the difference between final and initial positions.
- Distance is a scalar quantity.
3. Speed, Velocity, and Acceleration
- Speed is distance travelled per unit time.
- Speed is a scalar quantity and can never be negative.
- Velocity is displacement per unit time.
4. Graphs of Motion
- A time-displacement graph shows how displacement changes with time.
- For a straight line on a time-displacement graph, the slope gives velocity.
- A greater slope means greater velocity.
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