1. King Fahd University of Petroleum & Minerals
Mechanical Engineering
Dynamics ME 201 BY
Dr. Meyassar N. Al-Haddad
Lecture # 11

2. Rectangular Coordinates

3. Normal and Tangential Coordinates Curve path and y = f (x) problems
Change in magnitude of velocity
Change in velocity’s direction

4. Free-Body Diagram n = tan-1(dy/dx) an Between vertical and normal
Select the object
Establish n, t, b coordinate system
Set an always acts in the positive n direction
Assume at acts in the positive t
Set W = mg always acts in a vertical direction–downward
Set normal force FN along normal line
Set frictional force Ff opposite to t direction n
= tan-1(dy/dx)
Between vertical and normal
positive negative an Ff at FN t mg

5. Review
Example 13-6
Example 13-7
Example 13-8
Example 13-9

6. Problem 13.8
v = 65 ft/s aA = ?
smooth slope
W = 150 lb
g = 32.2 ft/s2
m = W/g

7. Problem 13.68
m = 30kg
T = ? At 0 degree

8. Determine the angle at which the ball stops ?

9. Problem 13-80
w =5 lb k =10 lb/ft
unstretched length of 3m, N & a = ?

11. Thank You