These are directly from my notes:
Loose monetary policy involves the RBA buying government securities, which increases the money supply in the cash market, therefore resulting in a fall of the cash rate (or interest rate.)
When interest rates drop, it is cheaper for domestic consumers and businesses to borrow, because the cost of borrowing is now lower. Therefore, this stimulates consumer/business borrowing and investment, and increases demand and ecenomic growth.
Also, when interest rates drop, this discourages foreign investment/financial inflow because investing in Australia will give you a lower return than normal, increasing the money supply, reducing the demand for $A and leading to a depreciation of the curreny, encouraging foreign investors to invest elsewhere where interest rates are higher. A depreciation of the currency also makes exports cheaper relative to imports, therefore making our exports more internationally competitive and more affordable to foreign buyers, whilst buying for imports is less affordable domestically. Because our exports are cheaper and more affordable, there will be a rise in aggregate demand and a rise in Net Exports, stimulating ecenomic growth.
As a result of low interest rates, the cost of servicing debts falls, which encourages consumers to direct the cash into additional spending, increasing growth and demand.
That's about all you would really need to say.