REALLY!
This guy (who teaches in my county) calls himself "Captain Physics" and misses BOTH of these basic questions that another teacher posted on our county list serve. Bad enough that Teacher #1 didn't have a solution but WTF.



(Sorry. Rant = Off)
Original Quote:
On Fri, Nov 18, 2016 at 9:59 AM, ********.**** wrote:
I am having trouble explaining these two questions. The first We understand that It is newtons 3rd law that says there is an equal and opposite force. But the student in frustration says, THEN WHAT MAKES THING MOVE!? Can someone help me with explaining this.
#23 I got E initially and was about to accept B as an answer because of the wording of the question, but A is correct. HELP!
3) In order to get an object moving, you must push harder on it than it pushes back on you.
A) True
B) False
Answer: B
23) A 6.00-kg ornament is held at rest by two light wires that form 30° angles with the vertical, as shown in the figure. An external force of magnitude
F acts vertically downward on the ornament. The tension exerted by each of the two wires is denoted by
T. A free-body diagram, showing the four forces that act on the box, is shown in the figure. If the magnitude of force
F is 410 N, what is the magnitude of the tension
T?
View attachment 1353465
A) 271 N
B) 235 N
C) 188 N
D) 376 N
E) 470 N
Answer: A
Response:
For Question 3 . . . .You would have to push harder to get it to move. In order for an object to go from not moving to any motion - it must accelerate (if only for a moment). Or it wouldn't move at all.
For question 23 - I also got something close to answer B. Since they are the same angle . . the upward force will be 2Tcos30 = 410 . . .so T is about 237 N.
Captain physics
"Defender of the Physical Way'