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2 Forces and Newton’s Laws Online Quiz Questions

Use this free practice quiz with 20 questions to review 2 Forces and Newton’s Laws, test your knowledge, and prepare for your next test or exam.

20 questions
01
True or false
1 point

For an ideal spring, the minus sign in F⃗s=−kx⃗\vec F_s=-k\vec x indicates that the spring force is a restoring force.

  1. A

    True

  2. B

    False

02
Choose one
1 point

Which expression gives the SI base-unit equivalence for one newton?

  1. A

    1 N=1 kg⋅m/s21\,\text{N}=1\,\text{kg·m/s}^2

  2. B

    1 N=1 kg⋅m/s1\,\text{N}=1\,\text{kg·m/s}

  3. C

    1 N=1 kg⋅m2/s21\,\text{N}=1\,\text{kg·m}^2/\text{s}^2

03
Choose one
1 point

When drawing a free-body diagram for one selected object, which set of forces belongs on the diagram?

  1. A

    Every external force acting on the chosen object

  2. B

    Every force the chosen object exerts on other objects

  3. C

    The net force as an additional force arrow

  4. D

    All forces acting on nearby objects

04
Fill in the blank
1 point

The pulling force transmitted by a taut cord or rope is called .

05
True or false
1 point

For an object on a horizontal surface, the normal force must equal its weight regardless of other forces or acceleration.

  1. A

    True

  2. B

    False

06
Written response
1 point

A cart moves with constant nonzero velocity while its net external force is zero. What is this condition called?

07
Fill in the blank
1 point

The vector sum of all forces acting on an object is called the .

08
Choose one
1 point

A 50 N50\,\text{N} force points 30∘30^\circ above the positive x-axis. Which pair gives its approximate x- and y-components?

  1. A

    Fx≈43 N,  Fy=25 NF_x\approx43\,\text{N},\;F_y=25\,\text{N}

  2. B

    Fx=25 N,  Fy≈43 NF_x=25\,\text{N},\;F_y\approx43\,\text{N}

  3. C

    Fx=50 N,  Fy=0 NF_x=50\,\text{N},\;F_y=0\,\text{N}

  4. D

    Fx≈−43 N,  Fy=−25 NF_x\approx-43\,\text{N},\;F_y=-25\,\text{N}

09
Choose all
1 point

Select all statements that correctly describe the friction models in use here.

  1. A

    Static friction adjusts as needed up to fs≤μsNf_s\leq\mu_sN.

  2. B

    A common model for kinetic friction is fk=μkNf_k=\mu_kN.

  3. C

    Friction always points opposite the object's overall velocity.

  4. D

    Static friction always has magnitude μsN\mu_sN.

10
Choose all
1 point

Object A exerts a force on object B. Select all statements that must be true of the corresponding Newton’s third-law force pair.

  1. A

    The forces occur simultaneously.

  2. B

    The forces have equal magnitudes and opposite directions.

  3. C

    The forces act on different objects.

  4. D

    The forces cancel on the free-body diagram of either object.

  5. E

    The two objects must have equal masses.

11
Choose one
1 point

A block slides on a frictionless ramp tilted at angle θ\theta above horizontal. Which component of its weight produces acceleration along the ramp?

  1. A

    mgcos⁡θmg\cos\theta, directed into the ramp

  2. B

    mgsin⁡θmg\sin\theta, directed down the ramp

  3. C

    The normal force, directed perpendicular to the ramp

  4. D

    The full weight mgmg, directed along the ramp

12
Written response
1 point

Two horizontal forces act on an object: 18 N18\,\text{N} to the right and 7 N7\,\text{N} to the left. What is the magnitude of the net force?

13
Written response
1 point

A 3.0 kg3.0\,\text{kg} object experiences a net external force of 12 N12\,\text{N}. What is the magnitude of its acceleration in m/s2\text{m/s}^2?

14
Open ended
1 point

Explain the difference between mass and weight. Include the SI unit of each and their relationship near Earth’s surface.

15
Choose one
1 point

A crate slides to the right across a horizontal floor while a person pulls it to the right. Which set of arrows belongs on a free-body diagram of the crate?

  1. A

    Weight, normal force, applied pull, and net force

  2. B

    Weight, normal force, and the force the crate exerts on the floor

  3. C

    Weight, normal force, applied pull, and kinetic friction

  4. D

    Weight, normal force, applied pull, kinetic friction, and the force the crate exerts on the floor

16
Choose one
1 point

A cart moves in a straight line at constant velocity in an inertial reference frame. What can be concluded about the net external force on the cart?

  1. A

    The net force must point in the direction of motion.

  2. B

    The net force is zero.

  3. C

    The net force must point opposite the direction of motion.

  4. D

    The net force must be nonzero because the object is moving.

17
Choose one
1 point

A 3 kg3\,\text{kg} object experiences a net force of 12 N12\,\text{N} to the right. What is its acceleration?

  1. A

    0 m/s20\,\text{m/s}^2

  2. B

    4 m/s24\,\text{m/s}^2 to the left

  3. C

    36 m/s236\,\text{m/s}^2 to the right

  4. D

    4 m/s24\,\text{m/s}^2 to the right

18
Choose one
1 point

A person pushes horizontally on a wall. Which two forces form the Newton’s third-law pair for this interaction?

  1. A

    The person pushes on the wall, and the wall pushes on the person.

  2. B

    The person pushes on the wall, and the floor pushes on the person.

  3. C

    The wall’s force on the person and the person’s weight.

  4. D

    The person’s push on the wall and the wall’s weight.

19
True or false
1 point

The normal force on an object always has the same magnitude as the object’s weight.

  1. A

    True

  2. B

    False

20
Written response
1 point

A block slides down a frictionless ramp tilted 30∘30^\circ above horizontal. Using g=9.8 m/s2g=9.8\,\text{m/s}^2, what is the block’s acceleration down the ramp?