frictional forces

[F.B]

I need help with this question please.

 

A skier on a slope inclined at 4.7 degrees to the horizontal pushes on ski poles and starts down the slop. The initial speed is 2.7 m/s. The coefficient of kinetic friction is between the skies and snow is 0.11. Determine how far the skier will slide before coming to rest.

 

This question doesnt have mass, it doesnt have acceleration. I don't how to find Fnet.

 

Can anyone please help me start this question.

[swansont]

I need help with this question please.

 

A skier on a slope inclined at 4.7 degrees to the horizontal pushes on ski poles and starts down the slop. The initial speed is 2.7 m/s. The coefficient of kinetic friction is between the skies and snow is 0.11. Determine how far the skier will slide before coming to rest.

 

This question doesnt have mass' date=' it doesnt have acceleration. I don't how to find Fnet.

 

Can anyone please help me start this question.[/quote']

 

I think you'll find that mass doesn't matter. If you can assume that the skier is on earth, you can use the appropriate value of g for the vertical acceleration and trig to find the acceleration components due to the incline.

[F.B]

ya i just figured that out now. thx.

But i have another question that i am stuck on that's a bit harder. I'll post it right here instead of making a new topic.

 

An adult is pulling two small children in a sleigh over level snow. The sleigh and children have a total mass of 47 kg. The sleigh rope makes an angle of 23 degrees with the horizontal. The coefficient of kinetic friction betwen the sleigh and the snow is 0.11. Calculate the magnitude of the tension in the rope needed to keep the sleigh moving at a constant velocity. (Hint. The normal force is not equal to the force of gravity.)

 

I don't know what to figure out first. See i need Fn but i can't figure it out.

I think Fn=Fg - Fapp(in the y direction). But i dont have a force to help me out.

[swansont]

ya i just figured that out now. thx.

But i have another question that i am stuck on that's a bit harder. I'll post it right here instead of making a new topic.

 

An adult is pulling two small children in a sleigh over level snow. The sleigh and children have a total mass of 47 kg. The sleigh rope makes an angle of 23 degrees with the horizontal. The coefficient of kinetic friction betwen the sleigh and the snow is 0.11. Calculate the magnitude of the tension in the rope needed to keep the sleigh moving at a constant velocity. (Hint. The normal force is not equal to the force of gravity.)

 

I don't know what to figure out first. See i need Fn but i can't figure it out.

I think Fn=Fg - Fapp(in the y direction). But i dont have a force to help me out.

 

You also have an equation in the x-direction that you can use.

[LazerFazer]

Well, I would set my axes parallel to the slope, so that your acceleration is in the direction of your axes. Then you can split mg into x- and y-components, and then in the y you have Fn and (mg)y and in the x you have T and (mg)x. That should help solve the problem.

 

Cheers,

LF