Greg pulls a rope attached to a sled with a force of 60 N. The rope makes an angle of 60° with the ground, as shown below.

What force will move the sled vertically upwards?

42.92 N

51.96 N

30 N

20 N

Question

Greg pulls a rope attached to a sled with a force of 60 N. The rope makes an angle of 60° with the ground, as shown below.



 
What force will move the sled vertically upwards?

 42.92 N

 51.96 N

 30 N

 20 N

anonymous · Answer

Do you know how to take x and y components of a force? This should help

anonymous · Answer

I got an error sorry

anonymous · Answer

^ So did I

anonymous · Answer

the picture is just a 60 degree angle

whpalmer4 · Answer

People not using that system won't be able to use links to pages on it.

whpalmer4 · Answer

Well, we can reason it out.  If the rope pulls straight up, all of the force is used to pull the sled vertically upwards.  We know that there's a sin or a cos in there.  Which one?  Well, the one that gives us a value of 1 at 90 degrees, which is sin.  So, our upward force component must be $F \sin \theta$.  If we plug in our values from this problem, the upward component is $(60N)(\sin 60^\circ ) \approx 51.96 N$.  A glance at a diagram confirms that most of the force will be going upward.

anonymous · Answer

thanks that helped a lot