Attracted to the Earth

Attracted to the Earth

1. Weight

   • The sensation of weight is only felt from the reaction force
   • Only two ways to be weightless
     • Have no mass
     • no net gravitational field

2. Gravitational field strength

   • Force per unit of mass (Nkg-1)

3. Viscosity

   • measurement of a fluid's resistance to flow
   • Unit - Pa s. Pascal seconds
   • Two types of flow
     • Streamline
     • Turbulent

4. Stokes Law applies to:

   • Small, spherical objects
   • viscous solution

5. Newton's Law

   • every particle of matter attracts every other particle of matter with a force directly proportional to the product of their masses
   • F=GmM/r2
   • inverse square law

6. Gravitational Potential is negative

   • It is an attractive force
   • at an infinite distance away from earth Grav pot is 0
   • as an object falls it loses grav pot meaning it must be negative