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Horizontal and vertical component of acceleration

  • Thread starter lolzwhut?
  • Start date
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Honestly, I am soo confused...And this is the last problem left. If I get it wrong then I'm in trouble. Please help! I don't know what to do at all.

A skier squats low and races down a(n) 11 degrees ski slope. During a 5 second interval, the skier accelerates at 2.3 m/s^2.

(A) What is the horizontal component of the skier's acceleration (perpendicular to the direction of free fall)? Answer in units of m/s^2.

(B) What is the vertical component of the skier's acceleration? Answer in units of m/s^2.


Givens:
11 degree ski slope, 5 seconds interval, acceleration = 2.3 m/s^2.


2. Homework Equations :
No clue what to use :S



3. The Attempt at a Solution
All my previous attempts were completely off topic :(

Please can someone do this problem, and show me how it's done?
 

berkeman

Mentor
55,900
5,953
Honestly, I am soo confused...And this is the last problem left. If I get it wrong then I'm in trouble. Please help! I don't know what to do at all.

A skier squats low and races down a(n) 11 degrees ski slope. During a 5 second interval, the skier accelerates at 2.3 m/s^2.

(A) What is the horizontal component of the skier's acceleration (perpendicular to the direction of free fall)? Answer in units of m/s^2.

(B) What is the vertical component of the skier's acceleration? Answer in units of m/s^2.


Givens:
11 degree ski slope, 5 seconds interval, acceleration = 2.3 m/s^2.


2. Homework Equations :
No clue what to use :S



3. The Attempt at a Solution
All my previous attempts were completely off topic :(

Please can someone do this problem, and show me how it's done?
No we won't do your problem for you. That's not how the PF works. Please re-read the Rules link at the top of the page

Draw the free body diagram for the skier and show the forces and acceleration. That should get you to the answer pretty quickly.
 
32
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No we won't do your problem for you. That's not how the PF works. Please re-read the Rules link at the top of the page

Draw the free body diagram for the skier and show the forces and acceleration. That should get you to the answer pretty quickly.
I dont know how to show the forces..The is the only problem thats holding me back.
 

berkeman

Mentor
55,900
5,953
I dont know how to show the forces..The is the only problem thats holding me back.
Have you drawn a free body diagram before? What will it look like in this problem?

Presumably there is no friction, so there will be no friction force back up the slope. So the only force on the skier is due to what? Draw that force and its vertical and horizontal components. Remember that F=ma, and remember the kinematic equations of motion under constant acceleration. What are those equations for position and velocity?
 
32
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Have you drawn a free body diagram before? What will it look like in this problem?

Presumably there is no friction, so there will be no friction force back up the slope. So the only force on the skier is due to what? Draw that force and its vertical and horizontal components. Remember that F=ma, and remember the kinematic equations of motion under constant acceleration. What are those equations for position and velocity?
I'm still lost because the assignment I'm doing has problems that have not yet been taught by our instructor....I'm still not clear on how to conduct this problem. How do i draw the force with its vertical and horizontal components? I mean the only givens we really have is acceleration, time and the degree of the slope
 

berkeman

Mentor
55,900
5,953
I'm still lost because the assignment I'm doing has problems that have not yet been taught by our instructor....I'm still not clear on how to conduct this problem. How do i draw the force with its vertical and horizontal components? I mean the only givens we really have is acceleration, time and the degree of the slope
You're fishing trying to get me to do the work for you. Aint going happen. Post the kinematic equations of motion that you will use. Tell us what forces act on the skier. Do the work.
 
32
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You're fishing trying to get me to do the work for you. Aint going happen. Post the kinematic equations of motion that you will use. Tell us what forces act on the skier. Do the work.
You said F=ma.

Well, how can we use that if we only have acceleration that fits in that? We don't have mass.
Also, what would we use the 11 degrees for?
 

berkeman

Mentor
55,900
5,953
You said F=ma.

Well, how can we use that if we only have acceleration that fits in that? We don't have mass.
Also, what would we use the 11 degrees for?
Yes, you will use F=ma, where F is the sum of all the vector forces you have in your free body diagram (FBD). The 11 degrees is the slope of the incline, which you will use to resolve your forces into horizontal and vertical components. You will use the kinematic equations of motion to get the accleration from the final speed and distance. Use wikipedia if you need more info on the kinematic equations of motion or FBDs:

http://en.wikipedia.org/wiki/Free_body_diagram

I'm off the PF for a while starting now. Please spend the time reading the info at wikipedia, and draw your FBD. I don't believe you when you say this hasn't been covered in class. Even if true, the wikipedia links provide the info.
 

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