Chapter 5. Force and Motion - GSU
[Pages:33]Chapter 5. Force and Motion
In this chapter we study causes of motion: Why does the windsurfer blast across the water in the way he does? The combined forces of the wind, water, and gravity accelerate him according to the principles of dynamics. Chapter Goal: To establish a connection between force and motion.
Copyright ? 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley.
Chapter 5. Force and Motion
Topics: ? Force ? A Short Catalog of Forces ? Identifying Forces ? What Do Forces Do? ? Newton's Second Law ? Newton's First Law ? Free-Body Diagrams
Copyright ? 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley.
Force: Properties
1. Push or Pull 2. Acts on an object 3. Force is a vector 4. Force is either a contact force or long range force
3
Copyright ? 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley.
Force: Properties
Force is a vector ? The net force is the vector sum of the individual forces
How can we find the individual force?
4
Copyright ? 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley.
Major Forces:
1. Weight ? gravitational force
r r pulls the objects down ? determines its direction w = mg magnitude:
m - Mass of the object
m
g = 9.8 s2
- free-fall acceleration
5
Copyright ? 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley.
Major Forces:
rr w = mg 1. Weight ? gravitational force
2. Spring Force
Fsp = kx
k - coefficient, which depends
only on geometric parameters of the spring
x =| l | - change in the length of the spring
6
Copyright ? 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley.
Major Forces:
1. Weight ? gravitational force
2. Spring Force
Fsp = kx
rr w = mg
r T 3. Tension Force
direction is always in the direction of the rope
magnitude - usually found from the condition of equilibrium
7
Copyright ? 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley.
Major Forces: r r 1. Weight ? gravitational force w = mg
2. Spring Force Fsp = kx
r 3. Tension Force T
4. Normal Force
r n
direction is always perpendicular to the surface
magnitude - usually found from the condition of equilibrium
8
Copyright ? 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley.
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