Book edition 9th Edition

Author(s) Raymond A. Serway, John W. Jewett

Pages 1624 pages

ISBN 9781133947271

Answers without the blur.

Just sign up for free and you're in.

Short Answer

Question: A wad of sticky clay of mass m is hurled horizontally at a wooden block of mass M initially at rest on a horizontal surface. The clay sticks to the block. After impact, the block slides a distance d before coming to rest. If the coefficient of friction between the block and the surface is $μ$ , what was the speed of the clay immediately before impact?

The speed of the clay immediately before impact is, $v_{c} = \frac{(M + m)}{m} \sqrt{2 μ g d}$ .

See the step by step solution

Step by Step Solution

TABLE OF CONTENTS :

TABLE OF CONTENTS

Step 1: Concept

The linear momentum of an object can be written as

$P = m v$ (1)

Here, represents the momentum, represents the mass of the particle, represents the speed of the particle.

Step 2: Stating given data

Mass of the clay, m.

Mass of the block, M.

The coefficient of friction between the block and the surface is $μ$ .

The distance traveled by block before coming to rest, d.

Step 3: Speed of clay immediately before the impact

In this case, the collision is inelastic, which means the total momentum is conserved.

Thus, the total momentum before the impact is equal to the total momentum after the momentum is the same; we can mathematically write this as

$P_{b i} + P_{c i} = P_{b f} + P_{c f}$

From equation (1), we can write the above expression as

$m_{b} v_{b i} + m_{c} v_{c i} = m_{b} v_{b f} + m_{c} v_{c f}$ (2)

Here i and f subscript represent the initial and final values.

Before the impact:

The block is at rest, $v_{b i} = 0$ .

And the clay is moving with a velocity $v_{c}$ , $v_{c i} = v_{c}$

After the impact:

They stick together, behave as a single object, and move with a velocity of $v_{c b}$ .

Substituting the values in equation 2, we get

$M 0 + m v_{c} = M v_{c b} + m v_{c b} m v_{c} = (M + m) v_{c b} v_{c} = \frac{(M + m)}{m} v_{c b}$

The kinetic energy of the clay block system after the impact when they are stuck together can be written as

$Δ K = \frac{1}{2} (M + m) v_{c b}^{2}$

The work done on the system due to the frictional force can be calculated as

$W = F d$

Here is the frictional force that is $F = μ (M + m) g$ .

This work done and the overall kinetic energy will be equal due to the energy conservation principle, which means

$Δ K = W$ (4)

Now, substituting the values in equation 4, we get

$\frac{1}{2} (M + m) v_{c b}^{2} = μ (M + m) g d v_{c b} = \sqrt{2 μ g d}$ (5)

From equations 3 and 5, we can write

$v_{c} = \frac{(M + m)}{m} \sqrt{2 μ g d}$

Thus, the speed of the clay immediately before impact is $v_{c} = \frac{(M + m)}{m} \sqrt{2 μ g d}$ .

Find Study Materials for

Create Study Materials

Select your language

Physics For Scientists & Engineers

Answers without the blur.

Short Answer

Step by Step Solution

Step 1: Concept

Step 2: Stating given data

Step 3: Speed of clay immediately before the impact

Most popular questions for Physics Textbooks

Want to see more solutions like these?

Recommended explanations on Physics Textbooks

Select your language

Physics For Scientists & Engineers

Answers without the blur.

Short Answer

Step by Step Solution

Step 1: Concept

Step 2: Stating given data

Step 3: Speed of clay immediately before the impact

Most popular questions for Physics Textbooks

Want to see more solutions like these?

Recommended explanations on Physics Textbooks

Work Energy and Power

Radiation

Astrophysics

Physics of Motion

Scientific Method Physics

Fluids

Torque and Rotational Motion

Nuclear Physics

Fields in Physics

Measurements

Space Physics

Electricity

Physical Quantities and Units

Medical Physics

Electrostatics

Further Mechanics and Thermal Physics

Mechanics and Materials

Engineering Physics

Energy Physics

Force

Particle Model of Matter

Waves Physics

Magnetism

Modern Physics

Atoms and Radioactivity

Dynamics

Electricity and Magnetism

Conservation of Energy and Momentum

Fundamentals of Physics

Kinematics Physics

Circular Motion and Gravitation

Linear Momentum

Rotational Dynamics

Oscillations

Translational Dynamics

Geometrical and Physical Optics

Thermodynamics

Magnetism and Electromagnetic Induction

Electromagnetism

Electric Charge Field and Potential

Turning Points in Physics