4. FORCE Can change the state of motions, forms and sizes an object

5. FORCE IS THE VECTOR MAGNITUDE YOU MUST BE REMEMBER TO APPLAY THE FORMULA OF RESULTANT VECTOR

6. NORMAL FORCE N N N θ The normal force is the contact force wich acts in perpendicular direction to the contact plane if two object are in contact of each other

8. Newton’s law First law Σ F = 0 Object at rest V = 0, a = 0 Object moves in uniform rectilinear motion V ≠ 0, a = 0

9. Newton’s second law If there is rsultant 0f the force acting upon it, couse the object experiences change of velocity ( change magnitude, direction or both ) Σ F = m.a Uniformly Constan acceleration

10. NEWTON’S THIRD LAW When two objects A and B interact each other, They exert forces upon each other

11. Another kinds of force Centripetal force Circular motion