Forces of nature

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Across
  1. 2. the force that the Earth exerts on the objects near its centre
  2. 4. the unit of force in the International System of Units
  3. 5. the force of attraction or repulsion between magnets
  4. 9. the force exerted on a object by a surface that supports it
  5. 11. change of velocity or speed
  6. 12. the force that opposes the movement at the interface between two objects in contact
Down
  1. 1. the force of attraction or repulsion between electrical charges
  2. 3. scientist who studied the relationship between the force exerted on a spring and its elongation
  3. 6. the force of attraction between the masses of objects
  4. 7. pushing, pulling or deformation of an object resulting from its interaction with another object
  5. 8. instrument that measures forces based on the resilient deformation of a calibrated spring
  6. 10. the rate at which an object moves