Forces

3. a body of coherent matter, usually of indefinite shape and often of considerable size
5. the amount or quantity of heaviness or mass; amount a thing weighs.
9. Acceleration is the rate of change of velocity.
11. a fundamental interaction which causes mutual attraction between all things with mass or energy.
14. The net force is defined as is the sum of all the forces acting on an object.
15. The force resisting the motion of a rolling body on a surface is known as rolling friction or rolling resistance. Rolling of ball or wheel on the ground is an example of Rolling friction

1. the quantity of motion of a moving body, measured as a product of its mass and velocity.
2. To have unbalanced forces means that the force applied in one direction is greater than the force applied in the opposite direction.
4. We can define sliding friction as the resistance created by any two objects when sliding against each other
6. forces that are equal in size and opposite in direction
7. Static friction is a force that keeps an object at rest
8. Fluid friction occurs between fluid layers that are moving relative to each other
10. force is necessary to provide a mass of one kilogram with an acceleration of one meter per second.
12. a tendency to do nothing or to remain unchanged
13. strength or energy as an attribute of physical action or movement.