Friction

Gap-fill exercise

  
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
1. Ball bearings are used between hubs and the axles of ceiling fans to friction.

2. The frictional force exerted by fluids is also called .

3. is the force of friction exerted by fluids on objects in motion through them.

4. The sprinkling of powder on the carrom board friction.

5. The cause of friction if the on the two surface in contact.

6. The force is responsible for wearing out of bicycle tyres.

7. Friction depends on the of the surface and how the two surface press each other.

8. Fluid friction depends on the and of the object and the of the fluid.

9. Friction is of the area of contact.

10. Vigorously rubbing hands shows that friction produces .