derive the relation between force and acceleration
According to the Newton's first law of motion the force is directly related to the change in momentum of a body, so
F = dp/dt
now momentum is given a. p = mv
where m is the mass and v is the velocity
so,
F = d(mv)/dt = m(dv/dt)
or we get
F = ma
this derivation involves differentiation which taught in class 11, so it's okay if you don't follow the steps entirely...