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# Forces notes 2010

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### Forces notes 2010

1. 1. FORCES •Why does an object move? •Why does an object change directions? •Why does an object stop, or start to move?
2. 2. WHAT IS A FORCE?  Force- push or pull.  Described by magnitude (strength) and direction  Measured in Newtons (N)
3. 3. FORCES  When forces are exerted in the same direction the two forces are added. 6N+3N=9N
4. 4. FORCES IN OPPOSITE DIRECTIONS  When forces are exerted in the opposite directions one force is given a + number the other is given a – number, and these numbers are added.
5. 5. Balanced and Unbalanced Forces
6. 6. UNBALANCED FORCE  When one force is greater in magnitude than the other it creates an unbalanced force.  This is what causes objects to move, stop, and change directions.
7. 7. + = Force 1 + Force 2 = Net Force UNBALANCED FORCE 1 direction
8. 8. NALANCED FORCES CHANGE THE MOTION OF AN OBJECT Unbalanced Forces change the motion of an object
9. 9. BALANCED FORCE  When both forces are equal in magnitude and in opposite directions it creates a balanced force.  The net force will then be equal to 0.  No movement occurs. I bet this guy hopes the forces stay balanced!!
10. 10. + = 0 2 forces cancel each other BALANCED FORCES