1. Jon draws two force diagrams to represent two different objects of interest which are the forces acting upon the ball and the forces that act upon Chris. Yes, two force diagrams are needed because we need to find FnetY, which is the accumulative forces in the Y direction.
2. Yes the calculation will produce the correct mass of Chris because when we find the ball's force which which is in the negative direction, we take the force and subtract it from 2000N and divide by the gravitational constant which should be the correct mass.
3. Two things are wrong/missing. Fearth on Ball in the second diagram should be Fball on Chris . FnetX, we do not know whether or not there are any unbalanced forces in the X direction that may come into effect.
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This is good work but you've missed one of the important parts of the solution.
ReplyDeleteIf you want to earn another point on this assignment, solve the problem and bring your solution to office hours to explain it to me, then explain Jon's errors in a new post on your blog, before Wednesday at 12pm.
Grade =3/4