Acceleration: The rate of change of velocity of an object; calculated as change in velocity divided by time (a = Δv/Δt); measured in meters per second squared (m/s²). Projectile Motion: The motion of ...Acceleration: The rate of change of velocity of an object; calculated as change in velocity divided by time (a = Δv/Δt); measured in meters per second squared (m/s²). Projectile Motion: The motion of an object thrown or projected into the air, subject to only the acceleration of gravity. Newton’s Laws of Motion: Three fundamental laws describing the relationship between the motion of an object and the forces acting on it.