Question

Take one book and place them on a table top. Slide the book over its surface. Now, place a few pencils in between the book and the table top. Again move the book on the table top. In which two cases, you have exerted lesser force? What does this tell us about rolling and sliding friction

Answer 1

Answer:

Explanation:

When we lift this book from the table by hand, the force is exerted by muscles of our arms. When we Kick a football, the force is exerted by the muscles of our legs. The force exerted by the muscles of the body is called muscular force