Motion in a Straight Line
Uttar Pradesh Board · Class 11 · Physics
Flashcards for Motion in a Straight Line — Uttar Pradesh Board Class 11 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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What is motion? Define it with respect to position and time.
Answer
Motion is the change in position of an object with time. An object is said to be in motion if its position changes with respect to time. Motion is described relative to a chosen reference point or ori…
What is rectilinear motion? Give two examples from daily life.
Answer
Rectilinear motion is the motion of an object along a straight line. Examples: (1) A car moving on a straight road, (2) A ball falling vertically downward under gravity, (3) Motion of a lift in a buil…
Define displacement. How is it different from distance?
Answer
Displacement is the change in position of an object. It is given by Δx = x₂ - x₁. Displacement is a vector quantity (has direction) and can be positive, negative, or zero. Distance is the actual path …
What is average velocity? Write its formula and SI unit.
Answer
Average velocity is the total displacement divided by the total time taken. Formula: v̄ = Δx/Δt = (x₂ - x₁)/(t₂ - t₁). SI unit: m/s (meter per second). It can be positive, negative, or zero depending …
Define instantaneous velocity. How is it calculated?
Answer
Instantaneous velocity is the velocity of an object at a particular instant of time. It is calculated as: v = lim(Δt→0) Δx/Δt = dx/dt. Graphically, it equals the slope of the tangent to the position-t…
What is the difference between speed and velocity?
Answer
Speed is the rate of change of distance (scalar quantity, always positive). Velocity is the rate of change of displacement (vector quantity, can be positive or negative). Speed = distance/time, Veloci…
Define average acceleration. Write its formula and SI unit.
Answer
Average acceleration is the change in velocity divided by the time interval. Formula: a = Δv/Δt = (v₂ - v₁)/(t₂ - t₁). SI unit: m/s² (meter per second squared). It can be positive, negative, or zero.
What is instantaneous acceleration? How is it related to velocity-time graph?
Answer
Instantaneous acceleration is the acceleration at a particular instant of time. Formula: a = lim(Δt→0) Δv/Δt = dv/dt. On a velocity-time graph, it equals the slope of the tangent to the curve at that …
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