(i)Classify the types of force based on their application .
(ii)Which instrument is used to measure the electric current? How should it be connected in a circuit?

Explanation

Based on the direction in which the forces act, they can be classified into two types as: (i)Like parallel forces and (ii)Unlike parallel forces
Like parallel forces: Two or more forces of equal or unequal magnitude acting along the same direction, parallel forces to each other are called like parallel forces.
Unlike parallel forces : If two or more equal forces of unequal forces act along opposite directions parallel to each other, then they are called unlike parallel forces.
(a) Ammeter is used to measure the current.
(b) An Ammeter is connected in series with the circuit.
(c) The Ammeter is a low impedance device connecting it in parallel with the circuit would cause a short circuit, damaging the Ammeter or the circuit .