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muddyjch
Sep15-09, 11:37 AM
1. The problem statement, all variables and given/known data
A person with a mass of 80kg pulls horizontally on the handle of a door which is locked. At that
instant, the ground reaction force has a magnitude of 810N. What is the force applied to the door?
(200 N)


2. Relevant equations



3. The attempt at a solution
It seems like there is something missing in this question and does the persons mass really matter? I am really confused on this one.
berkeman
Sep15-09, 01:02 PM
1. The problem statement, all variables and given/known data
A person with a mass of 80kg pulls horizontally on the handle of a door which is locked. At that
instant, the ground reaction force has a magnitude of 810N. What is the force applied to the door?
(200 N)


2. Relevant equations



3. The attempt at a solution
It seems like there is something missing in this question and does the persons mass really matter? I am really confused on this one.

Welcome to the PF. Start by drawing a free body diagram (FBD) of the person, and list all of the forces that are acting on him/her. Be sure to include all horizontal and vertical forces. Then use the fact that the person is not moving, which implies that the sum of the forces is....?