Recap Notes: Mass and Weight

1. What is mass?
   Mass is a measure of an object resistance to motion
2. What is weight?
   Weight is the gravitational force exerted on an object by Earth.
3. What are the differences between mass and weight
   Mass and weight are different in physics.
   1- Mass doesn't change when you go to the Moon, but weight does.
   2- Mass is a scalar quantity, but weight is a vector quantity that reflects the size of gravity.
   3- Mass is measured by Kilogram (Kg) but weight is measured by Newton (N).
4. How do we calculate weight?
   Weight is defined as mass times gravitational acceleration that is W = mg  where: W is weight in Newton (N), m is mass in kg, and g is the acceleration of gravity in m/s².
5. If your mass is 70 kg on Earth, your weight is
   W=(70 kg)(9.8 m/s²) = 686 N.
6. What is the mass of an object that has a weight of 115 N on the Moon?
   The gravity of the Moon is 1/6 of g (which is 9.8 m/s²).