A passenger is pulling on the strap of a 15 [kg] suitcase such that the suitcase moves to the right ans speeds up. The tension in the strap is 70. [N] and the strap is inclined 35 degrees above the horizontal.

If the acceleration is 1.3 m/s^2, find the frictional force acting on the suitcase.

EH? How do you do a problem like this? I don't really understand how to find a frictional force based on acceleration. :confused:

Use F=ma

Use trigonometry to find the force acting on the suitcase which is horizontal. Using F=ma, find the resultant force acting on the suitcase. The difference in force will be the frictional force.

a is acceleration
m is mass of suitcase
F is force

Hope it helped! By the way, post back your answer.