physics

3. the rate of change of velocity
8. strength or energy as an attribute of physical action or movement
9. a useful reference point for calculations in mechanics that involve masses distributed in space
12. the combined effect of all the forces on the object's acceleration
13. he resistance that one surface or object encounters when moving over another
16. the force exerted on a body by gravity

1. a force, velocity, or other vector quantity which is equivalent to the combined effect of two or more component vectors acting at the same point
2. a quantity that has magnitude and direction and that is commonly represented by a directed line segment
4. a state of adjustment between opposing or divergent influences or elements
5. an invisible barrier of exerted strength or impetus
6. force necessary to provide a mass of one kilogram with an acceleration of one metre per second per second.
7. a coherent, typically large body of matter with no definite shape
10. a graphical illustration used to visualize the applied forces, moments, and resulting reactions
11. the rate at which someone or something is able to move or operate.
14. force that surfaces exert to prevent solid objects from passing through each other
15. a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force