PHY 121 FINAL EXAM REVIEW Questions
with Verified Correct Answers
Suppose that a car traveling to the west (the -x direction) begins to slow down as it
approaches a traffic light. Which statement concerning its acceleration in the x
direction is correct?
A) Its acceleration is positive but its velocity is negative.
B)Both its acceleration and its velocity are negative.
C)Its acceleration is negative but its velocity is positive.
D)Both its acceleration and its velocity are positive.
A) Its acceleration is positive but its velocity is negative.
The motion of a particle is described in the velocity versus time graph shown in the
figure. We can say that its speed
A) decreases.
B) increases.
C) decreases and then increases.
D) increases and then decreases.
C) decreases and then increases.
The figure shows the velocity of a particle as it travels along the x-axis. What is the
direction of the acceleration at t = 0.5 s?
,A) in the +x direction
B) in the -x direction
C) The acceleration is zero.
B) in the -x direction
For general projectile motion, when the projectile is at the highest point of its
trajectory?
A) its acceleration is zero.
B) the horizontal and vertical components of its velocity are zero.
C) its velocity is perpendicular to the acceleration.
D) its velocity and acceleration are both zero.
E) the horizontal component of its velocity is zero.
C) its velocity is perpendicular to the acceleration.
Alice and Tom dive from an overhang into the lake below. Tom simply drops straight
down from the edge, but Alice takes a running start and jumps with an initial
horizontal velocity of 25 m/s. Neither person experiences any significant air resistance.
Compare the time it takes each of them to reach the lake below.
A) Alice and Tom will reach the surface of the lake at the same time.
B) Tom reaches the surface of the lake first.
C) Alice reaches the surface of the lake first.
A) Alice and Tom will reach the surface of the lake at the same time.
A pilot drops a package from a plane flying horizontally at a constant speed. Neglecting
air resistance, when the package hits the ground the horizontal location of the plane will
,A) be behind the package.
B) be in front of the package.
C) depend of the speed of the plane when the package was released.
D) be over the package.
D) be over the package.
While an object is in projectile motion (with upward being positive) with no air
resistance
A) the vertical component of both its velocity and its acceleration remain constant.
B) the horizontal component of its velocity remains constant and the vertical component
of its acceleration is equal to -g.
C) the horizontal component of its velocity remains constant and the horizontal
component of its acceleration is equal to -g.
D) the vertical component of its velocity remains constant and the vertical component of
its acceleration is equal to -g.
E)the horizontal component of its velocity remains constant and the vertical component
of its acceleration is equal to zero.
B) the horizontal component of its velocity remains constant and the vertical component of its
acceleration is equal to -g.
Alice and Tom dive from an overhang into the lake below. Tom simply drops straight
down from the edge, but Alice takes a running start and jumps with an initial
horizontal velocity of 25 m/s. Neither person experiences any significant air resistance.
Just as they reach the lake below
A) the speed of Alice is larger than that of Tom.
, B) the speed of Tom will always be 9.8 m/s larger than that of Alice.
C) the speed of Alice will always be 25 m/s larger than that of Tom.
D) they will both have the same speed.
E) the splashdown speed of Alice is larger than that of Tom.
A) the speed of Alice is larger than that of Tom.
An object is moving to the right, and experiencing a net force that is directed to the
right. The magnitude of the force is decreasing with time. The speed of the object is
A) constant in time.
B) increasing.
C) decreasing.
B) increasing.
You swing a bat and hit a heavy box with a force of 1500 N. The force the box exerts on
the bat is
A) greater than 1500 N if the bat bounces back.
B) exactly 1500 N whether or not the box moves.
C) exactly 1500 N only if the box does not move.
D) less than 1500 N if the box moves.
E) greater than 1500 N if the box moves.
B) exactly 1500 N whether or not the box moves.
You are standing in a moving bus, facing forward, and you suddenly fall forward as the
bus comes to an immediate stop. The force that pushes forward on you as the bus stops
is
with Verified Correct Answers
Suppose that a car traveling to the west (the -x direction) begins to slow down as it
approaches a traffic light. Which statement concerning its acceleration in the x
direction is correct?
A) Its acceleration is positive but its velocity is negative.
B)Both its acceleration and its velocity are negative.
C)Its acceleration is negative but its velocity is positive.
D)Both its acceleration and its velocity are positive.
A) Its acceleration is positive but its velocity is negative.
The motion of a particle is described in the velocity versus time graph shown in the
figure. We can say that its speed
A) decreases.
B) increases.
C) decreases and then increases.
D) increases and then decreases.
C) decreases and then increases.
The figure shows the velocity of a particle as it travels along the x-axis. What is the
direction of the acceleration at t = 0.5 s?
,A) in the +x direction
B) in the -x direction
C) The acceleration is zero.
B) in the -x direction
For general projectile motion, when the projectile is at the highest point of its
trajectory?
A) its acceleration is zero.
B) the horizontal and vertical components of its velocity are zero.
C) its velocity is perpendicular to the acceleration.
D) its velocity and acceleration are both zero.
E) the horizontal component of its velocity is zero.
C) its velocity is perpendicular to the acceleration.
Alice and Tom dive from an overhang into the lake below. Tom simply drops straight
down from the edge, but Alice takes a running start and jumps with an initial
horizontal velocity of 25 m/s. Neither person experiences any significant air resistance.
Compare the time it takes each of them to reach the lake below.
A) Alice and Tom will reach the surface of the lake at the same time.
B) Tom reaches the surface of the lake first.
C) Alice reaches the surface of the lake first.
A) Alice and Tom will reach the surface of the lake at the same time.
A pilot drops a package from a plane flying horizontally at a constant speed. Neglecting
air resistance, when the package hits the ground the horizontal location of the plane will
,A) be behind the package.
B) be in front of the package.
C) depend of the speed of the plane when the package was released.
D) be over the package.
D) be over the package.
While an object is in projectile motion (with upward being positive) with no air
resistance
A) the vertical component of both its velocity and its acceleration remain constant.
B) the horizontal component of its velocity remains constant and the vertical component
of its acceleration is equal to -g.
C) the horizontal component of its velocity remains constant and the horizontal
component of its acceleration is equal to -g.
D) the vertical component of its velocity remains constant and the vertical component of
its acceleration is equal to -g.
E)the horizontal component of its velocity remains constant and the vertical component
of its acceleration is equal to zero.
B) the horizontal component of its velocity remains constant and the vertical component of its
acceleration is equal to -g.
Alice and Tom dive from an overhang into the lake below. Tom simply drops straight
down from the edge, but Alice takes a running start and jumps with an initial
horizontal velocity of 25 m/s. Neither person experiences any significant air resistance.
Just as they reach the lake below
A) the speed of Alice is larger than that of Tom.
, B) the speed of Tom will always be 9.8 m/s larger than that of Alice.
C) the speed of Alice will always be 25 m/s larger than that of Tom.
D) they will both have the same speed.
E) the splashdown speed of Alice is larger than that of Tom.
A) the speed of Alice is larger than that of Tom.
An object is moving to the right, and experiencing a net force that is directed to the
right. The magnitude of the force is decreasing with time. The speed of the object is
A) constant in time.
B) increasing.
C) decreasing.
B) increasing.
You swing a bat and hit a heavy box with a force of 1500 N. The force the box exerts on
the bat is
A) greater than 1500 N if the bat bounces back.
B) exactly 1500 N whether or not the box moves.
C) exactly 1500 N only if the box does not move.
D) less than 1500 N if the box moves.
E) greater than 1500 N if the box moves.
B) exactly 1500 N whether or not the box moves.
You are standing in a moving bus, facing forward, and you suddenly fall forward as the
bus comes to an immediate stop. The force that pushes forward on you as the bus stops
is
