Force

• Force can

-make a stationary body to move;

-make a moving body to change its velocity (magnitude or direction );

-change the size or shape of an object.

• Force is a vector. It has both magnitude and direction. It can be added. The sum of all forces acting on an object is called net force, resultant force or unbalanced force.Unit : newton(N)

Reference websites:

1. http://www.glenbrook.k12.il.us /gbssci /phys /Class /newtlaws /

2. http://www.physics.auburn.edu /demo /mech /