Science

4. , applied to an object in opposite directions that are not equal in size.
6. ,The force resisting the motion of a rolling body on a surface
8. ,the quantity of motion of a moving body, measured as a product of its mass and velocity.
9. ,The force with which an object near the Earth or another celestial body is attracted toward the center of the body by gravity.
11. , the vector sum of all the forces that act upon an object.
13. ,the resistance created by any two objects when sliding against each other.
15. , strength or energy as an attribute of physical action or movement.

1. ,the rate of change of velocity.
2. ,the property of matter that measures its resistance to acceleration.
3. ,a force that keeps an object at rest.
5. ,forces When the forces acting on an object have equal strength and act in opposite directions
7. ,a force that restricts the movement either within itself or of another medium moving through the liquid.
10. ,responsible for working out many of the principles of visible light and the laws of motion, and contributing to calculus.
12. ,the force by which a planet or other body draws objects toward its center.
14. ,a tendency to do nothing or to remain unchanged.