Across
- 4. a number greater than or equal to zero which measures the effect of friction between an object and a surface.
- 7. a simplification of a real-life situation used in a model.
- 9. a body which is at rest but on the point of moving.
- 11. an object that cannot be stretched.
- 14. the size of a vector.
- 15. the rate of change of an object's velocity with respect to time.
- 16. the force in a compressed rod.
- 18. a resistive force due to the roughness of a surface.
- 20. the turning effect a force has about a pivot.
Down
- 1. a wheel over which a string passes.
- 2. an influence that can change the motion of a body.
- 3. the study of the motion of objects.
- 5. a body which is modelled as having no mass.
- 6. a body which moves only under the influence of gravity.
- 8. a body that does not bend.
- 10. a mathematical approximation of a real-life situation.
- 12. reaction force from the surface acting on an object.
- 13. a surface where there is no friction.
- 17. a body whose mass is unevenly distributed.
- 19. a long, thin, straight, rigid body.