ALL ABOUT FORCES

This series introduces simple science topics using everyday objects and situations that readers can recognize in the world around them. This title looks at forces: what they are, what effects they have, how friction affects them and what effects different surfaces have.

Aceasta serie introduce subiecte stiintifice simple folosind obiecte si situatii de zi cu zi pe care cititorii le pot recunoaste in lumea din jur. Acest titlu priveste fortele: ce sunt, ce efecte au, cum le afecteaza frictiunea si ce efecte au diferite suprafete.