Is LeBron James in equilibrium?
Is the ball in equilibrium?
The Pacman or Ricky Hatton?
FORCE & EQUILIBRIUM
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)
Pushing Force
Compressive force Creates compression
Pulling Force
Tensile force Creates tension The tension is the same at all points in
the rope
Contact Force
Results from physical contact between two objects
Field Force
Acts between disconnected objects
Characteristics of a Force
Magnitude Direction Point of Application
Effects of Force
1. Changes the state of motion of a body
- accelerates the body
2. Deformation
- mass is the same but volume changes
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,
0F
Static Equilibrium
The equilibrium possessed by bodies at rest.
The velocity of the body is zero.
Dynamic Equilibrium
The equilibrium possessed by bodies in motion.
The velocity of the body does not change; its acceleration is zero.