GCSE Physics (AQA)

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Scalars & Vectors

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Forces Forces and their interactions

Scalars & Vectors

3:25 Introduction to Vectors and Forces
Spec 4.5.1.1 4.5.1.2
Previous Dangers of Large Decelerations Next Representing Vectors as Arrows
  • A scalar is a quantity that has magnitude but no direction.
  • Magnitude refers to the physical size of something.
  • An example of a scalar is distance, which can be measured with a ruler either vertically or horizontally.
  • Distance depends only on measurement, not on the direction of measurement.
  • Quantities with both magnitude and direction are called vectors.
  • An example of a vector is displacement, which is distance in a specific direction.
  • Displacement requires specifying both magnitude and direction (e.g., three centimeters up or to the right).
  • Even if measurements are the same, different directions mean different displacements, highlighting the difference between scalars and vectors.
  • Key scalars include distance, speed, energy, mass, and temperature.
  • Key vectors include displacement, velocity, acceleration, forces, and momentum.
  • Velocity is the vector equivalent of speed, indicating movement in a particular direction.
  • Acceleration measures how velocity changes and also requires a direction.
  • Forces, which change the motion of an object, and momentum, the product of mass and velocity, both require direction specification.
  • Understanding the difference between scalars and vectors is crucial for exams like the GCSE.

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