Reading a graph
Classical Mechanics
Level
2
-
The velocity vs time graphic below describes how velocity of an object changes as a function of time, starting at point P (
):
- A:
- B: Between points P and Q, the object DECELERATES
- C:
- D: after point Q, the object ACCELERATES
Which statement is FALSE? (There might be more than one WRONG statement).
B
None of them
C
D
All of them
A
B and D
A and C
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1 solution
Speeding up means that the magnitude (or numerical value) of the velocity is getting large (E.g. 1 m/s to 2 m/s is speeding up, -1 m/s to -2 m/s is also speeding up). In each case, the magnitude of the velocity (the number itself, not the sign or direction) is increasing; the speed is getting bigger. So, in this case, the object is decelerating between points P and Q. It is also true that vQ=0 and vP is greater than 0, and that after point Q the object accelerates, since the velocity, in magnitude, increases. None of the statements are wrong.