1. Is LeBron James in
equilibrium?

2. Is the ball in equilibrium?

3. The Pacman or Ricky
Hatton?

5. Force
Commonly imagined as a push or
pull on an object
Vector quantity
 May be a contact force or a field
force
 SI unit of newton (N)

6. Pushing Force
Compressive force
Creates compression

7. Pulling Force
Tensile force
Creates tension
 The tension is the same at all points in
the rope

8. Contact Force
 Results from physical contact between
two objects

9. Field Force
Acts between disconnected objects

10. Characteristics of a
Force
Magnitude
 Direction
 Point of Application

11. Effects of Force
1. Changes the state of motion of a body
- accelerates the body
2. Deformation
- mass is the same but volume changes

12. Equilibrium
Possessed by a body that is either at
rest or moving in a constant velocity
 The net force acting on the object is
zero,
F  0

13. Static Equilibrium
The equilibrium possessed by bodies
at rest.
 The velocity of the body is zero.

14. Dynamic Equilibrium
The equilibrium possessed by bodies
in motion.
 The velocity of the body does not
change; its acceleration is zero.