1. Force Types 1 Definition of Force Drawing the Force Dimensions and Units of Force Tension Elastic Force Gravity Normal Force Friction Drag Pulleys

2. Force Types 2 Force That which causes a particle to accelerate. It is a vector! Knight’s Definition A force … is a push or a pull on an object. It is a vector. It has both magnitude and direction. It requires an agent. Something does the pushing or pulling. It is either a contact force or a long-range force (gravity).

3. Force Types 3 Force, like any vector is drawn as an arrow with the symbol or magnitude and units. The tail of the force is placed on the part of the object that is experiencing the force. In a free-body diagram, the tail is placed on the point representing the particle. The direction of the force and its magnitude are determined by the type of force it is.

4. Force Types 4 Force The SI unit of force is the Newton (abbreviated as N). One Newton is the same as one kilogram-meter per second squared. Another unit of force is the pound.

5. Force Types 5 Tension The magnitude of the tension is the same everywhere in the rope.

6. Force Types 6 Name of Force Symbol When does this force occur? Where does this force occur? Associated Energy Tension If an object that is experiencing the force is pulling but not stretching another object On the object that is experiencing the force at the point where the pulling occurs No associated energy

7. Force Types 7 Spring Force

8. Force Types 8 Name of Force Symbol When does this force occur? Where does this force occur? Associated Energy Spring Force On the object experiencing the force where it connects to the object that stretches/compresses Elastic Potential Energy If an object that is experiencing the force is stretching (or compressing) another object

9. Force Types 9 Gravity

10. Force Types 10 Name of Force Symbol When does this force occur? Where does this force occur? Associated Energy Gravity or At the center-of-mass of the object receiving the force Gravitational Potential Energy If there are two massive objects present

11. Force Types 11 Normal Force m N m N w

12. Force Types 12 Name of Force Symbol When does this force occur? Where does this force occur? Associated Energy Normal Force or If an object touches the surface of another object On the object receiving the force at the point(s) where it touches the surface No associated energy

13. Force Types 13 Friction m N f Direction of motion or possible motion m N f

14. Force Types 14 Name of Force Symbol When does this force occur? Where does this force occur? Associated Energy Friction or If an object touches the surface of another object On the object receiving the force at the point(s) where it touches the surface Thermal Energy

15. Force Types 15 Drag D

16. Force Types 16 Name of Force Symbol When does this force occur? Where does this force occur? Associated Energy Drag If an object is moving through a liquid or gas. On the object receiving the force at the point(s) where it touches the liquid or gas Thermal Energy

17. Force Types 17 Pulleys Pulleys simply change the DIRECTION of a force. T T