Asked by Sarah

Consider two tennis balls on a flat table. The two balls touch each other and are at rest. Which of the following equations is Newton's law in the vertical direction for the tennis ball closer to the observer? use N for normal forces, F for contact forces between the two balls, and W for weights.

F + W = 0
F - W = 0
N + W = 0
N - W = 0
N - F = 0
Answered by bobpursley
F, and W are in different directions. How can the sum be in the vertical?
Answered by Hannah
I think it would be N-W = 0

because my FBD for the ball would be

N
^
|
F<--BALL
|
v
W
Answered by Hannah
Sorry, the FBD kind of messed up. The ball is in the middle with the F force coming out on the left of the ball.

Is this answer correct?
Answered by Sarah
I don't know yet...but I think that should be the right answer.
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