measure of quantity of matter in an object

1. measure of quantity of matter in an object measure of the downward pull (gravity) of the earth an object experiences not constant, depends on gravity constant, does not depend on gravity determined by comparing the mass of an object with a set of standard masses that are part of a balance determined by reading the amount that an object pulls down on a spring

2. Mass vs. Weight • On the Moon the downward pull is approximately 1/6 of that on Earth • 1988 Leonid Taraneko set the world lifting record by lifting 475.0 kg • 1 kg weighs about 9.8 N or 2.2 pounds on Earth

3. 1 1/6 0 475.0 475.0 475.0 1045 174.2 0 4655 775.8 0

4. Will it hurt? no yes no no no yes no yes

5. Mass • 1 g = 1 small paper clip • 1 mg = 10 grains of salt or 2 drops of water. • 1 gram is defined as the mass of 1 mL of water at 4 ºC. • 1000 g = 1000 mL of water • 1 kg = 1 L of water