5 .The Laws of Motion
The Laws of Motion
5.1 The Concept of Force
The only known fundamental forces in nature are all field forces:
Measuring the Strength of a Force
Because forces are vector quantities, you must use the rules of vector addition to obtain the net force acting on an object.
5.2 Newton’s First Law and Inertial Frames
5.4 Newton’s Second Law
5.5 The Force of Gravity and Weight
5.6 Newton’s Third Law
Newton’s Third Law
Definition of normal force
5.7 Some Applications of Newton’s Laws
free-body diagram
EXAMPLE : A Traffic Light at Rest
EXAMPLE : Atwood’s MachineDetermine the magnitude of the acceleration of the two objects
and the tension in the lightweight cord.
EXAMPLE : One Block Pushes Another
5.8 Forces of Friction
5.8 Forces of Friction
Force of static friction Force of kinetic friction
5.8 Forces of Friction
EXAMPLE : Acceleration of Two Connected Objects When Friction Is Present
APPLICATION: Automobile Antilock Braking Systems (ABS)