Scalar - A quantity with magnitude (size) only, Vector - A quantity with magnitude and direction, Instantaneous Speed - Speed at a particular instant, calculated by v = length of card/time through light gate, Acceleration - The rate of change of velocity, Distance from a Speed – time graph - Calculated from the area under the graph (triangles, squares, rectangles), Acceleration from a Speed – time graph. - The gradient of the graph by using a = v – u/t, Work done - A measure of the energy transferred. Calculated using Ew = Fd, (Gravitational) Potential Energy - When work is done against gravity. Calculated using Ep = mgh, Conservation of energy - Ep = Ek in the absence of friction, or Ep = Ek + Ew with friction, Joules - The unit of energy, Constant velocity - Horizontal component of projectile motion velocity., Constant acceleration, velocity increases - Vertical component of velocity for projectile motion. Final velocity can be calculated using v = u + at, Newton’s first law - Forces are balanced. Object either at rest or moving at a constant speed., Friction - A force that opposes motion, this force increase as the object increases in speed.,

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