Question

when he opened an envelope, he found sheets of paper
true or false​

Answer 1

Answer:

Which chapter is this

Pls post the question again

Answer 2

Answer:

Friction is a force that opposes motion between any surfaces that are touching. Friction can work for or against us. For example, putting sand on an icy sidewalk increases friction so you are less likely to slip. On the other hand, too much friction between moving parts in a car engine can cause the parts to wear out. Other examples of friction are illustrated in