Dynamics Chapter 12 Questions and Answers 2025/2026
only a mass - CORRECT ANSWER-In dynamics, a particle is assumed to have _________.
A) both translation and rotational motions
B) only a mass
C) a mass but the size and shape cannot be neglected
D) no mass or size or shape, it is just a point
sT/Δt - CORRECT ANSWER-The average speed is defined as __________.
A) Δr/Δt
B) Δs/Δt
C) sT/Δt
D) None of the above.
1.6 m/s2 ← - CORRECT ANSWER-A particle moves along a horizontal path with its velocity
varying with time as shown. The average acceleration of the particle is _________.
A) 0.4 m/s2 → B) 0.4 m/s2 ←
C) 1.6 m/s2 → D) 1.6 m/s2 ←
0 ft/s
(Can we calculate average speed from this problem statement? No! We do not know the total
path distance) - CORRECT ANSWER-A particle has an initial velocity of 30 ft/s to the left. If it
then passes through the same location 5 seconds later with a velocity of 50 ft/s to the right, the
average velocity of the particle during the 5 s time interval is _______.
, A) 10 ft/s → B) 40 ft/s →
C) 16 m/s → D) 0 ft/s
0.0 ft
s = s0 + v0t + ½ at^2 ; s = (0) + (-3)(3) + .5(2)(3)^2 = -9 + 9 = 0 - CORRECT ANSWER-A particle has
an initial velocity of 3 ft/s to the left at
s0 = 0 ft. Determine its position when t = 3 s if the acceleration is 2 ft/s2 to the right.
A) 0.0 ft B) 6.0 ft ←
C) 18.0 ft → D) 9.0 ft →
100 ft
v^2 = v02 + 2ac(s - so); (30)^2 = (12)^2 + 2(3.78)(s - 0); s = 100 ft - CORRECT ANSWER-A particle
is moving with an initial velocity of v = 12 ft/s and constant acceleration of 3.78 ft/s2 in the
same direction as the velocity. Determine the distance the particle has traveled when the
velocity reaches 30 ft/s
A) 50 ft B) 100 ft C) 150 ft D) 200 ft
acceleration. - CORRECT ANSWER-The slope of a v-t graph at any instant represents
instantaneous
A) velocity. B) acceleration.
C) position. D) jerk.
v-t - CORRECT ANSWER-Displacement of a particle over a given time interval equals the area
under the ___ graph during that time.
A) a-t B) a-s
only a mass - CORRECT ANSWER-In dynamics, a particle is assumed to have _________.
A) both translation and rotational motions
B) only a mass
C) a mass but the size and shape cannot be neglected
D) no mass or size or shape, it is just a point
sT/Δt - CORRECT ANSWER-The average speed is defined as __________.
A) Δr/Δt
B) Δs/Δt
C) sT/Δt
D) None of the above.
1.6 m/s2 ← - CORRECT ANSWER-A particle moves along a horizontal path with its velocity
varying with time as shown. The average acceleration of the particle is _________.
A) 0.4 m/s2 → B) 0.4 m/s2 ←
C) 1.6 m/s2 → D) 1.6 m/s2 ←
0 ft/s
(Can we calculate average speed from this problem statement? No! We do not know the total
path distance) - CORRECT ANSWER-A particle has an initial velocity of 30 ft/s to the left. If it
then passes through the same location 5 seconds later with a velocity of 50 ft/s to the right, the
average velocity of the particle during the 5 s time interval is _______.
, A) 10 ft/s → B) 40 ft/s →
C) 16 m/s → D) 0 ft/s
0.0 ft
s = s0 + v0t + ½ at^2 ; s = (0) + (-3)(3) + .5(2)(3)^2 = -9 + 9 = 0 - CORRECT ANSWER-A particle has
an initial velocity of 3 ft/s to the left at
s0 = 0 ft. Determine its position when t = 3 s if the acceleration is 2 ft/s2 to the right.
A) 0.0 ft B) 6.0 ft ←
C) 18.0 ft → D) 9.0 ft →
100 ft
v^2 = v02 + 2ac(s - so); (30)^2 = (12)^2 + 2(3.78)(s - 0); s = 100 ft - CORRECT ANSWER-A particle
is moving with an initial velocity of v = 12 ft/s and constant acceleration of 3.78 ft/s2 in the
same direction as the velocity. Determine the distance the particle has traveled when the
velocity reaches 30 ft/s
A) 50 ft B) 100 ft C) 150 ft D) 200 ft
acceleration. - CORRECT ANSWER-The slope of a v-t graph at any instant represents
instantaneous
A) velocity. B) acceleration.
C) position. D) jerk.
v-t - CORRECT ANSWER-Displacement of a particle over a given time interval equals the area
under the ___ graph during that time.
A) a-t B) a-s
