1. Force Problems

2. Problem #1 80 N @ 70° above +x 60 N @ 25° above -x 75 N
What is the resultant?

3. Force x y
60N
-60cos25
60sin25
75N
-75
80N
80cos70
80sin70
Totals
-27.02
25.53

4. Problem #2
m = 15 kg
μk = 0.6
120 N
What is the acceleration?

6. Problem #3
m = 15 kg
μk = 0.6
35°
250 N
What is the acceleration?

8. Inclined Plane Problems (Ramps)

9. Setup

10. mgsinq
mgcosq q

11. Find the Acceleration FN Ff X Y Weight 10(9.8)sin30 -10(9.8)cos30
mass = 10 kg mg
30o X Y
Weight
10(9.8)sin30
-10(9.8)cos30
Friction
-Ff
Normal FN
Total
49 - Ff
FN – 84.9

12. Ramp
Given mass m is at rest on a ramp that makes an angle θ with the horizontal, what is the minimum value of μs?

14. Combination
What is the acceleration?
M= 10 kg
μk= 0.25
m = 3 kg
40o

15. Treat the masses and the string as one system