Cart with propeller - Find force of friction

[jenn3999]

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 coefficient of friction

 

[radou]

The one and only key word: Newton's 2nd law.

 

[trajan22]

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 :)