According to the education and training of inquiry, the relationship between acceleration and force is: F=ma, f is the external force on the object, m is the mass of the object, and a is the acceleration of the object at the moment. Force is the cause of acceleration. If there is no force, there is no acceleration. Both force and acceleration are vectors, and the direction of acceleration of an object is determined by the direction of the resultant force of external forces on the object.

In uniform linear motion, the ratio of speed change to time used is called acceleration, and its international unit is meter/quadratic second. Acceleration has magnitude, direction and vector. Acceleration is related to the speed change and the time when the speed change occurs, but it has nothing to do with the speed. In kinematics, the acceleration of an object is directly proportional to the resultant force of external forces, and inversely proportional to the mass of the object, with the same direction and resultant force.