Kinematics

• What Does the Integral of Momentum with Respect to Time Mean?
  The time integral of momentum is not energy or impulse. For constant mass, it equals mass multiplied by displacement over the interval.
• How to Calculate Acceleration and Time from Speed and Distance
  Find acceleration and travel time from initial speed, final speed, and distance using constant-acceleration equations, with a worked example and sign checks.
• What Is the Area Under a Displacement–Time Graph?
  For a displacement–time graph, integrate displacement over time: the result has units of distance × time, not displacement. Learn how to calculate it.
• How to Calculate Average Acceleration Without Time
  Find acceleration without time from initial and final velocities and displacement when acceleration is constant; otherwise, more information is needed.
• How to Calculate the Acceleration of a Moving Elevator
  Calculate elevator acceleration from its change in velocity or from the net force, and determine whether it accelerates upward or downward.