PHY 121 TEST 1 QUESTIONS WITH VERIFIED
ANSWERS
Which of the motion diagrams below clearly do not correspond to motion with constant
acceleration?
• Only diagrams A, C, and E.
• Only diagram C.
• Only diagram E.
• Only diagrams A, C, D and E.
• Only diagrams C and E. - Answers - Only diagram E
(It's the one that looks like a circle)
The figure below shows a motion diagram for a certain object. (A grid is also shown to
facilitate quantitative analysis).
At which point does the acceleration vector point vertically down?
• The acceleration is never vertically down in this motion diagram.
• At point 7.
• At point 6.
• At point 8.
• At point 3. - Answers - At point 6.
The figure shows a pendulum bob oscillating back and forth between positions A and C.
An arrow with a question mark is drawn to the left of the pendulum. The direction of this
arrow best represents
• The bob's acceleration somewhere between points A and B.
• The bob's acceleration at point B.
• Neither the velocity nor the acceleration ever point in the direction of the black arrow.
• The bob's velocity approaching point C.
• The bob's acceleration at point A. - Answers - The bob's acceleration somewhere
between points A and B.
For the motion diagram above, which of the graphs below is the best representation of
the x-component of the acceleration 𝑎𝑥?
• Graph C. (Pyramid)
• Graph D. (Upsidown Pyramid)
• Graph A. (starts at a = 5 & t = 0 in a straight line, then at t = 10, it drops to a = -5, then
continues in a straight line at a = -5)
• Graph E. (Curve)
• Graph B. (starts at a = -5 & t = 0 in a straight line, then at t = 10, it goes up to a = 5,
then continues in a straight line at a = 5) - Answers - Graph A
(starts at a = 5 & t = 0 in a straight line, then at t = 10, it drops to a = -5, then continues
in a straight line at a = -5)
ANSWERS
Which of the motion diagrams below clearly do not correspond to motion with constant
acceleration?
• Only diagrams A, C, and E.
• Only diagram C.
• Only diagram E.
• Only diagrams A, C, D and E.
• Only diagrams C and E. - Answers - Only diagram E
(It's the one that looks like a circle)
The figure below shows a motion diagram for a certain object. (A grid is also shown to
facilitate quantitative analysis).
At which point does the acceleration vector point vertically down?
• The acceleration is never vertically down in this motion diagram.
• At point 7.
• At point 6.
• At point 8.
• At point 3. - Answers - At point 6.
The figure shows a pendulum bob oscillating back and forth between positions A and C.
An arrow with a question mark is drawn to the left of the pendulum. The direction of this
arrow best represents
• The bob's acceleration somewhere between points A and B.
• The bob's acceleration at point B.
• Neither the velocity nor the acceleration ever point in the direction of the black arrow.
• The bob's velocity approaching point C.
• The bob's acceleration at point A. - Answers - The bob's acceleration somewhere
between points A and B.
For the motion diagram above, which of the graphs below is the best representation of
the x-component of the acceleration 𝑎𝑥?
• Graph C. (Pyramid)
• Graph D. (Upsidown Pyramid)
• Graph A. (starts at a = 5 & t = 0 in a straight line, then at t = 10, it drops to a = -5, then
continues in a straight line at a = -5)
• Graph E. (Curve)
• Graph B. (starts at a = -5 & t = 0 in a straight line, then at t = 10, it goes up to a = 5,
then continues in a straight line at a = 5) - Answers - Graph A
(starts at a = 5 & t = 0 in a straight line, then at t = 10, it drops to a = -5, then continues
in a straight line at a = -5)
