Cart with propeller - Find force of friction

AI Thread Summary
To find the force of friction acting on a cart with a mass of 250 g moving down a 30-degree incline with an acceleration of 3.5 m/s², apply Newton's 2nd law. First, calculate the gravitational force acting on the cart and consider the force from the propeller, which is 0.3 N. By drawing a free body diagram, sum the forces acting along the incline and set them equal to the mass times the acceleration to solve for the force of friction. Finally, use the calculated force of friction to determine the coefficient of friction. This method effectively applies Newton's 2nd law to solve the problem.
jenn3999
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can anyone show me how to solve this problem?


a cart on wheels with a mass of 250 g has a motor driven propeller with a force P of .3 N, and it moved down an incline of 30 degrees with an acceleration of 3.5 m/s^2.

What is the force of friction ?

determine coefficent of friction
 
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The one and only key word: Newton's 2nd law.
 
1) draw a free body diagram of the problem
2)find the force of gravity on the cart,
3)and add this to other forces in that direction, you know the true acceleration therefore use Newtons second law to find force,
hope this helps :)
 
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