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. Friction opposes the between two surfaces in contacts.

2. Friction acts on the surfaces in contact.

3. The force required to overcome friction at the instant an object starts moving from rest is called .

4. is less than static friction.

5. Friction can be increased by making a surface .

6. can be minimised by giving suitable shapes to bodies moving in fluids.

7. To overcome fluid friction bodies of fish and birds are .

8. When one surface is sliding over the other surface, friction comes into play.

9. The substance which reduces friction is called .

10. When one body rolls over the surface of another body, the resistance to its motion is called the .