ANother force problem (Please offer any help you can)

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In summary, the horse does work against the friction force to move the sleigh for 5.0 km. If the sleigh is dragged a distance of 1.0 km, turned around, and then dragged 1.0 km in the opposite direction, the horse would do work against the friction force an additional 1.0 km.
  • #1
avb203796
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A horse plls a sleigh via a rope that makes an angle of 15 degrees above the horizontal. The sleigh has a mass of 300.0kg and the kinetic coefficent of friction between the sleigh and the snow is 0.15. If the sleigh moves at constatn velocity, how much work does the horse do as she drags the sleigh for 5.0 km? How much work is doen by friction? Hiow much work will be done by friction if the sleigh is dragged a distance of 1.0km, turned around, and then dragged 1.0 km in the opposite direction? Finally, if the sleigh is accelerated at 2.0 m/s^2, what is the tension in the rope and the work done on the sleigh by the horse over a distanc eof 0.1km?

I am not sure exactly where and how to begin!
 
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  • #2
Draw a free body diagram to get an easy breakthrough.
If the force applied by the horse is F, then the sleigh would move due to Fcos15deg. Fsin15deg would be applied against the weight of the sleigh. Thus the normal force would decrease by Fsin15deg and thus the kinetic friction force. I think now you must be able to solve.
 
  • #3
But how do I know what F is?
 
  • #4
If the sleigh is moving with constant velocith the work done by the horce is against the friction only.
 
  • #5
Don't you know the forceto be appliedif the sleigh has to move with constant velocity. That should exactly equal the friction force so that the netforce on the object is 0. Now can you continue?
 
  • #6
so does this mean that the force of the horse would be 441 or 441cos15deg
 
  • #7
no nigther. Draw the diagram, consider the tension T in the rope, resolve T in horizpntal and vertical, make two equations for Hz and Vt forces to balance, find Normal reaction( not equal to mg). . . . ...
 

1. What is a force problem?

A force problem is a scientific calculation that involves determining the magnitude and direction of a force acting on an object. This can involve various factors such as mass, acceleration, and friction.

2. How do I solve a force problem?

To solve a force problem, you will need to use Newton's laws of motion and apply them to the given situation. This involves identifying the forces acting on the object, setting up equations based on Newton's laws, and solving for the unknown variables.

3. What are the common types of force problems?

The most common types of force problems include static equilibrium problems, where the net force on an object is zero, and dynamic problems, where the object is accelerating or moving at a constant velocity. Other types include friction problems, tension problems, and circular motion problems.

4. What are some tips for solving force problems?

First, draw a free body diagram to clearly identify all the forces acting on the object. Then, use Newton's laws of motion to set up equations and solve for the unknown variables. It can also be helpful to break the problem down into smaller parts and solve them separately before combining the solutions.

5. Are there any common mistakes to avoid when solving force problems?

One common mistake is forgetting to consider all the forces acting on the object. It is important to include all forces, even if they seem small or insignificant. Another mistake is using incorrect units or not converting units properly. It is also important to double-check all calculations and make sure they make sense in the given situation.

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