Balanced and Unbalanced Forces

A train pulls some carriages. The train exerts a force of $40000 \mathrm{N}$ and frictional forces act in the opposite direction with a force of $35000 \mathrm{N}$. The total mass of the train and carriages is $200000 \mathrm{kg}$. What is the acceleration of the train?

A motorbike accelerates with a force of $1500 \mathrm{N}$. It experiences air resistance, which acts in the opposite direction with a magnitude of $1200 \mathrm{N}$. Calculate the unbalanced force that acts on the motorbike.

Balanced forces _____.

When unbalanced forces act on a body, the body _____.

When balanced forces act on a body, the body _____.

The unequal and opposite forces acting on a body, which change its state of rest or uniform motion are called _____.

Equal and opposite forces acing on a body which do not change its state of rest or of uniform motion are called _____.