Air resistance means that when dropped separately, the book and paper hit the ground at different times. But when they are...

At home 5-11 11-14

It is air resistance that makes the paper fall slowly, and the coin pushes the air out of the way for both itself and the...

At home 5-11 11-14

Frictional forces are a group of forces that affect movement. They can set things moving (as when you expect your shoe to grip...

Classroom Activity 5-11