Help with Newtons laws and friction

Click For Summary
SUMMARY

The discussion centers on solving a physics problem involving a girl skiing down a 35-degree inclined hill with a length of 120 meters and a coefficient of friction of 0.12. Key equations include ΣF = MA and the use of trigonometric functions to resolve forces. The acceleration can be calculated by considering both gravitational and frictional forces acting on the skier. The final solution requires determining the acceleration, time taken to travel the distance, and utilizing Free Body Diagrams (FBD) to visualize the forces involved.

PREREQUISITES
  • Understanding of Newton's laws of motion
  • Knowledge of Free Body Diagrams (FBD)
  • Familiarity with trigonometric functions (sine and cosine)
  • Basic algebra for solving equations
NEXT STEPS
  • Calculate acceleration using ΣF = MA with friction included
  • Determine time taken using kinematic equations
  • Explore the impact of different coefficients of friction on acceleration
  • Review additional examples of inclined plane problems in physics
USEFUL FOR

Students studying physics, particularly those focusing on mechanics and inclined planes, as well as educators looking for examples of applying Newton's laws in real-world scenarios.

beamerrox
Messages
1
Reaction score
0

Homework Statement


a girl is skiing down a 35 degree inclined hill that is 120 meters long. She starts from rest and the snow has a coefficient of friction of .12.
A. Draw an FBD
B what is her acceleration
c. How much time dows it take her to travel the 120 meters


Homework Equations


I am unsure on how to set up the question solution. I think it's CAE's that are used as well, but i am completely unsure.


The Attempt at a Solution


ΣF= MA
ΣF=9.8(m)
vi= 0m/s
ΛD=120 m
vf = ?
t=?
a=?
120cos35= 98.29?
120sin35= 68.82?

If anyone could please help i would really appreciate it. If i can figure out how to set this problem up and solve it, i will be able to figure the other problems out. Thank you so much!
I don't think there's enough to solve it using cae's can i use the sin and cosine functions with the 35 degrees??
 
Physics news on Phys.org
You have to take her direction of motion into consideration. If you've drawn a FBD you see that there's a difference in the direction of the forces that have an effect on her acceleration. If you can take this into consideration?
 

Similar threads

Newton's law problem: Pushing 2 stacked blocks on a horizontal table
  • · Replies 13 ·
Replies
13
Views
3K
Is it friction or tension acting on the person hanging on a rope?
  • · Replies 4 ·
Replies
4
Views
1K
Having a hard time learning Newton's 2nd law
  • · Replies 5 ·
Replies
5
Views
2K
Applying Newtons Laws: Incline, static friction, kid on sled
  • · Replies 8 ·
Replies
8
Views
2K
Newton's third law problem/kinematics (Airboat problem/no friction)
  • · Replies 3 ·
Replies
3
Views
4K
Applications of Newton's laws (friction related)
  • · Replies 8 ·
Replies
8
Views
2K
Object causing another object to move with zero friction
  • · Replies 3 ·
Replies
3
Views
2K
Is Newton's 3rd Law Cancelled in This Friction Problem?
  • · Replies 6 ·
Replies
6
Views
4K
Newton's Laws Homework question: Double incline mass problem
  • · Replies 4 ·
Replies
4
Views
2K
Solving Spool Acceleration Problem Using Newton's Laws
  • · Replies 12 ·
Replies
12
Views
3K