Excel in math and science.

Join using Facebook Join using Google Join using email

Forgot password? New user? Sign up

Existing user? Log in

Your answer seems reasonable. Find out if you're right!

That seems reasonable. Find out if you're right!

Join using Facebook Join using Google Join using email

Forgot password? New user? Sign up

Existing user? Log in

Classical Mechanics

1D Dynamics

Concept Quizzes

1D Dynamics Warmup
Free Body Diagrams
Forces - Equilibrium
Friction
1D Dynamics - Problem Solving

Challenge Quizzes

1D Dynamics: Level 1-2 Challenges
1D Dynamics: Level 3-5 Challenges

Free Body Diagrams

The above diagram shows two blocks of respective masses $m_1 = 7 \text{ kg}$ and $m_2 = 2 \text{ kg}$ which are connected by a massless string and placed on a horizontal frictionless surface. If a force of $F = 27 \text{ N}$ is applied to $m_1,$ what is the force exerted by the string on $m_2?$

9 \text{ N}

3 \text{ N}

6 \text{ N}

21 \text{ N}

Show explanation

View wiki

by Brilliant Staff

Two blocks of respective masses $m_1 = 6 \text{ kg}$ and $m_2 = 3 \text{ kg}$ are placed in contact on a horizontal frictionless surface. If a force of $F = 27 \text{ N}$ is applied to mass $m_1,$ what is the contact force on $m_2?$

10 \text{ N}

7 \text{ N}

9 \text{ N}

8 \text{ N}

Show explanation

View wiki

by Brilliant Staff

A block of mass $m = 15 \text{ kg}$ is held stationary against a wall by applying a horizontal force $F$ on it, as shown in the above figure. If the coefficient of static friction between the wall and the block is $\mu_s = 0.3$ and the coefficient of kinetic friction is $\mu_k = 0.2,$ what is the minimum value of $F$ required to hold the block against the wall?

The gravitational acceleration is $g = 10 \text{ m/s}^2.$

50 \text{ N}

625 \text{ N}

500 \text{ N}

75 \text{ N}

Show explanation

View wiki

by Brilliant Staff

Three blocks of respective masses $m_1 = 9 \text{ kg}, m_2 = 5 \text{ kg} \text{ and } m_3 = 2 \text{ kg}$ are placed in contact on a horizontal frictionless surface. If a force of $F = 16 \text{ N}$ is applied to $m_1,$ what is the contact force on $m_2$ (from $m_1$ )?

5 \text{ N}

7 \text{ N}

8 \text{ N}

9 \text{ N}

Show explanation

View wiki

by Brilliant Staff

A block of mass $m = 5 \text{ kg}$ is pulled by a force of $F = 30\sqrt{2} \text{ N}$ at an angle of $\theta = 45^\circ$ with the horizontal surface, as shown in the above figure. What is the acceleration of the block if the coefficient of kinetic friction between the surface and the block is $\mu = 0.2,$ assuming $g = 10 \text{ m/s}^2?$

3.9 \text{ m/s}^2

5.2 \text{ m/s}^2

7.8 \text{ m/s}^2

6.5 \text{ m/s}^2

Show explanation

View wiki

by Brilliant Staff