a scale.
You would use pounds or kilograms to measure the weight of a person.
pounds
You would use the unit of measurement called "kilograms" or "pounds" to measure the weight of a car.
The tool that a person would use to measure out a pound is called a scale. A scale can be used to weigh people as well. Pounds are a form of measure used on the Imperial system.
You would use the metric unit "kilograms" to measure the weight of a bag of groceries.
Ounces
a calculator
Newtons.
if i were you , i would use kg
Kilogram is a measure of weight - so you would use it to weight something. You would probably use it for objects that are large enough to make using grams unnecessary.
You would use the metric unit "kilograms" to measure the weight of a sack of peaches.