Q1
What is displacement?
AShortest distance from initial to final position
BTotal path length travelled
COnly speed
DOnly time taken
ICSEClass 9 (ICSE)PhysicsCh 2 · Topic 1
Motion in One Dimension
Motion in one dimension describes movement along a straight line, characterised by displacement, velocity, and acceleration.
Core concept
Displacement is the shortest distance from initial to final position, while distance is the total path length travelled, which can differ.
How it works
Velocity is the rate of change of displacement (speed with direction), while speed alone doesn't consider direction.
Why it matters
Acceleration is the rate of change of velocity, occurring when an object speeds up, slows down, or changes direction.
Key detail
Equations of motion, like v=u+at, help us calculate unknown quantities when some values (initial velocity, time, acceleration) are known.
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• Displacement is shortest distance from start to end.
• Distance is total path length travelled.
• Velocity is rate of change of displacement.
• It includes direction, unlike speed alone.
• Acceleration is rate of change of velocity.
• It occurs with speeding up, slowing down or direction change.
• v=u+at is an equation of motion.
• These equations calculate unknown motion quantities.