1. the force between two sliding objects that opposes their relative motion is called____.

2. A collection of two or more objects is called a ____.

3. ___ is anything which has mass and takes up space.

4. two unlike parallel forces of the same magnitude but not along the same line is called ___.

5. coal ,oil and natural gas are termed as ___.

6. _____it is a point in the body where the weight of the body appears to act vertically downward.

7. a quantity which is completely specified by its magnitude is called the ____ Quantity.

8. if the stress can produce a Change in volume of a body its called ____?

9. a quantity which can ve derived from base quantities is known as___.

11. _____ the applied force that brings a change in length , volume or shape of body.

12. ___ it deals with the study of internal Earth.

13. the ratio of stress and strain is called_____.

14. the increase in Volume of a body on heating is called ____?

15. if an object moves along a circular path, its motion is called ____.

16. A line about which all particles of a rigid body rotates is called ____.

17. the negative acceleration is called____.

18. ____its an instrument used to measure atmospheric pressure.

19. ____ force is that force that keeps a body to move in a circle.

20. the unit of base quantity is known as?