1. FORCE The Concept ofThe Concept of

2. FORCE [A PUSH OR A PULL] NOTE: WE CANNOT SEE FORCES. HOWEVER, WE CAN SEE THE EFFECTS [CHANGES].

3. FORCE The Concept ofThe Concept of [A PUSH OR A PULL] NOTE: WE CANNOT SEE FORCES. HOWEVER, WE CAN SEE THE EFFECTS [CHANGES]. [POSITION, SPEED, DIRECTION, & SHAPE]

4. Interaction gives rise to a PAIR of FORCES – same magnitude, opposite in directions, act on different objects, and act at the same time.

5. Interaction Contact Interaction

6. Interaction gives rise to a PAIR of FORCES – same magnitude, opposite in directions, act on different objects, and act at the same time.

7. Interaction

8. Interaction

9. Interaction

10. Types of forcesTypes of forces As revealed through the Act. 3, forces can be FRICTIONAL, MAGNETIC, ELECTROSTATIC, or GRAVITATIONAL.

11. Types of forcesTypes of forces As revealed through the Act. 3, forces can be FRICTIONAL, MAGNETIC, ELECTROSTATIC, or GRAVITATIONAL. THE ATTRACTIVE OR REPULSIVE FORCE THAT IS EXERTED BY MAGNETS.

12. Types of forcesTypes of forces As revealed through the Act. 3, forces can be FRICTIONAL, MAGNETIC, ELECTROSTATIC, or GRAVITATIONAL. THE ATTRACTIVE OR REPULSIVE FORCE EXERTED BY CHARGED OBJECTS TO EACH OTHER.

13. Types of forcesTypes of forces As revealed through the Act. 3, forces can be FRICTIONAL, MAGNETIC, ELECTROSTATIC, or GRAVITATIONAL. THE ATTRACTIVE FORCE EXERTED BY EARTH ON ANY OBJECT NEAR IT OR ON ITS SURFACE.

14. Types of forcesTypes of forces As revealed through the Act. 3, forces can be FRICTIONAL, MAGNETIC, ELECTROSTATIC, or GRAVITATIONAL. A FORCE THAT RESISTs MOTION; EXISTS BECAUSE INTERACTING OBJECTS’ SURFACES ARE IN CONTACT.

15. Mass & weight are two different quantities. Weight is a gravitational force [with magnitude & direction]. ACTIVITY 7.4 [IMPORTANT POINTS]ACTIVITY 7.4 [IMPORTANT POINTS] The SPRING BALANCE measures the WEIGHT of an object.

16. Weight varies directly with mass. The greater the mass, the greater the weight. ACTIVITY 7.4 [IMPORTANT POINTS]ACTIVITY 7.4 [IMPORTANT POINTS]