AnswersPhysicsOne-Dimensional Motion and Forces

Practice Test Answers

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1
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What is the displacement of the object?

A
negative 2 m
B
0 m
C
negative 1 m
D
3 m
2
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What is the net force acting on the child?

A
100 cap n
B
200 cap n
C
negative 100 cap n
D
0 cap n
3

What is the correct free body diagram of the broom?

A
Image with description A free body diagram with 4 force vectors. The first vector is pointing downward, labeled F Subscript g Baseline. The second is pointing right, labeled F Subscript p Baseline. The third vector is pointing upward, labeled F Subscript N Baseline. The fourth vector is pointing left, labeled F Subscript f. The upward vector is the same length as the downward vector. The right vector is the same length as the left vector.
B
Image with description A free body diagram with 3 force vectors. The first vector is pointing downward, labeled F Subscript g Baseline. The second vector is pointing right, labeled F Subscript p Baseline. The third vector is pointing upward, labeled F Subscript N Baseline. All three vectors are of equal length.
C
Image with description A free body diagram with 4 force vectors. The first vector is pointing downward, labeled F Subscript g Baseline. The second vector is pointing right, labeled F Subscript f Baseline. The third vector is pointing upward, labeled F Subscript N Baseline. The fourth vector is pointing up to the left, labeled F Subscript P Baseline.
D
Image with description A free body diagram with 4 force vectors. The first vector is pointing downward, labeled F Subscript g Baseline. The second vector is pointing left, labeled F Subscript f Baseline. The third vector is pointing upward, labeled F Subscript N Baseline. The fourth vector is pointing down to the right, labeled F Subscript P Baseline. All vectors are the same length.
4

A lab cart with a mass of 15 kilograms is moving with constant velocity, v , along a straight horizontal track. A student drops a 2 kilograms mass into it from directly above, and the cart continues moving. Which equation best represents the horizontal momentum in this situation?

A
15 v sub i plus 2 v sub f is equal to 15 times 0 plus 2 v sub i
B
15 times 0 plus 2 v sub i is equal to open paren 15 plus 2 close paren times v sub f
C
15 v sub i plus 2 times 0 is equal to open paren 15 plus 2 close paren times v sub f
D
15 v sub i plus 2 times 0 is equal to 15 v sub f plus 2 times 0
5

How does an airbag help protect a passenger in a car following a car accident?

A
It shortens the passenger’s stopping time, and this decreases the force.
B
It increases the passenger’s stopping time, and this decreases the force.
C
It increases the passenger’s stopping time, and this increases the force.
D
It shortens the passenger’s stopping time, and this increases the force.
6

According to Newton’s second law of motion, the acceleration of an object is inversely proportional to which quantity?

A
velocity
B
displacement
C
mass
D
net force
7

Jerome places a bag of flour on a scale. The scale shows that the bag has a weight of 17 N. Which is the reaction force of the bag sitting on the scale?

A
The scale exerts a 17 N force up on the bag.
B
Earth exerts a 17 N force down on the bag.
C
The scale exerts a 17 N force down on the counter.
D
The bag exerts a 17 N force down on the scale.
8

Following an inelastic collision, what can kinetic energy be converted into? Choose three correct answers.

A
momentum
B
impulse
C
potential energy
D
heat
E
sound
9

A large truck is moving at 22.0 meters per second If its momentum is 125 comma 000 kilograms times m over s , what is the truck's mass?

A
11 comma 400 kilograms
B
2750 kilograms
C
176 kilograms
D
5680 kilograms
10

Which graph shows an object with constant acceleration?

A
Image with description A graph titled Velocity versus Time shows time in seconds on the x axis, numbered 0 to 5, and velocity in meters per second on the y axis, numbered 0 to 10. A line starts at (0, 10) and ends at (5, 0).
B
Image with description A graph titled Velocity versus Time shows time in seconds on the x axis, numbered 0 to 10, and velocity in meters per second on the y axis, numbered 0 to 50. A line starts at the origin and goes to (4, 40), then a line from (4, 40) to (9, 40) and a line from (9, 40) to (10, 0).
C
Image with description A graph titled Velocity versus Time shows time in seconds on the x axis, numbered 0 to 5, velocity in meters per second on the y axis, numbered 0 to 35. A curved line starts at the origin and arcs up to (4.3, 35).
D
Image with description A graph titled Velocity versus Time shows time in seconds on the x axis, numbered 0 to 5, and velocity in meters per second on the y axis, numbered 0 to 5. A line starts from (0, 5) continues to (2, 2.5) to (4, 2.5) and ends at (5, 5).
11

Which best describes how to correct Hannah’s error?

A
Switch the chart headings “Speed” and “Velocity.”
B
Change the last row of the “Velocity” column to “does not depend on a reference frame.”
C
In the “Speed” column, change “has magnitude” to “is a displacement.”
D
Describe the calculation for speed as “dividing distance by time.”
12

In the table, which force has the wrong direction?

A
Gravity
B
Tension by Eduardo
C
Tension by Clara
D
Kinetic friction
13

In the table, which force has the wrong direction?

A
Tension by Eduardo
B
Kinetic friction
C
Gravity
D
Tension by Clara
14

What is the frictional force, cap f sub f , acting on the object?

A
negative 15 cap n
B
negative 244 point 5 cap n
C
negative 494 point 5 cap n
D
negative 5 point 5 cap n

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