Learning Task 4: Choose the correct word from the box
and write it on the blank to complete the sentence.
greater,smoother,friction, wheels,uses
the friction.
1. The rougher the surface, the_____the friction.
2. The_____
the surface, the lesser the friction.
3. Too much_____
causes the wearing away of
objects
4. Friction between two rubbing surfaces can be
reduced by using_____ oil or grease.
5. Friction has many_____​