Motion
Main Concepts
Motion- When an object changes its position with respect to time the
object is said to be in motion.
Rest VS Motion
When an object changes its position with respect to time the object is
said to be in motion. But when an object is not changing its position with
respect to time the object is said to be at rest.
Distance VS Displacement
Distance is the length covered by an object in a specific amount of time.
While displacement is shortest straight-line distance from start to end
point + direction (vector). Walk 3km around park but end 1km North =
displacement 1km North. �
Scalar VS Vector
Scalar is quantity with only magnitude, no direction (Ex: distance, speed,
mass). While Vector is quantity with magnitude + direction (Ex:
displacement, velocity, force).
10 Key Facts
Uniform motion = Equal distance equal time
Non-uniform = Unequal distance
Speed = Distance/Time
Velocity = Displacement/Time (direction matters)
Acceleration = Change velocity/Time
Distance-time graph: Straight = uniform; Curve = non-uniform
Speed-time: Slope = acceleration
Equations: v = u + at; s = ut + ½at²; v² = u² + 2as
Retardation = Negative acceleration
Average speed = Total distance/Total time �
6 Exam MCQs
Path length: (a) speed (b) distance ✓
Straight line shortest: (a) distance (b) displacement ✓
Main Concepts
Motion- When an object changes its position with respect to time the
object is said to be in motion.
Rest VS Motion
When an object changes its position with respect to time the object is
said to be in motion. But when an object is not changing its position with
respect to time the object is said to be at rest.
Distance VS Displacement
Distance is the length covered by an object in a specific amount of time.
While displacement is shortest straight-line distance from start to end
point + direction (vector). Walk 3km around park but end 1km North =
displacement 1km North. �
Scalar VS Vector
Scalar is quantity with only magnitude, no direction (Ex: distance, speed,
mass). While Vector is quantity with magnitude + direction (Ex:
displacement, velocity, force).
10 Key Facts
Uniform motion = Equal distance equal time
Non-uniform = Unequal distance
Speed = Distance/Time
Velocity = Displacement/Time (direction matters)
Acceleration = Change velocity/Time
Distance-time graph: Straight = uniform; Curve = non-uniform
Speed-time: Slope = acceleration
Equations: v = u + at; s = ut + ½at²; v² = u² + 2as
Retardation = Negative acceleration
Average speed = Total distance/Total time �
6 Exam MCQs
Path length: (a) speed (b) distance ✓
Straight line shortest: (a) distance (b) displacement ✓
