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A 1.80 -kg falcon catches a 0.650 -kg dove from behind in midair. What is their velocity after impact if the falcon's velocity is initially \(28.0 \mathrm{m} / \mathrm{s}\) and the dove's velocity is \(7.00 \mathrm{m} / \mathrm{s}\) in the same direction?

Short Answer

Expert verified
Their velocity after impact is approximately 23.7 m/s.

Step by step solution

01

Determine the system's initial momentum

Use the principle of conservation of momentum. To find the initial momentum of the system, calculate the momentum of both the falcon and the dove before the impact. The momentum (p) is the product of mass (m) and velocity (v). For the falcon: p_falcon = m_falcon * v_falcon. For the dove: p_dove = m_dove * v_dove.
02

Calculate the total initial momentum

Add the momenta of the falcon and the dove to get the system's total initial momentum. Total initial momentum (p_initial) = p_falcon + p_dove.
03

Apply conservation of momentum

According to the conservation of momentum, the total initial momentum of the system will be equal to the total final momentum. Total final momentum (p_final) = Total initial momentum (p_initial). Since the two animals move together after the impact, they will have a common velocity (v_final). Hence, p_final = (m_falcon + m_dove) * v_final.
04

Solve for the final common velocity

Set the total initial momentum equal to the total final momentum and solve for the final velocity (v_final). v_final = Total initial momentum / (m_falcon + m_dove).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Momentum Calculation
Momentum calculation plays a crucial role in understanding motion in physics. It is defined as the product of an object's mass and its velocity. Represented by the equation, momentum (p) is calculated as:
\[ p = m \times v \]
where \( m \) is the mass of the object in kilograms (kg) and \( v \) is the velocity in meters per second (m/s). When a system consists of multiple objects, like our falcon and dove example, the total momentum is the sum of the individual momenta. Here's how you compute it:
  • For the falcon: \( p_{falcon} = m_{falcon} \times v_{falcon} \)
  • For the dove: \( p_{dove} = m_{dove} \times v_{dove} \)
Momentum not only tells us about the motion quantity but also incorporates the direction, since velocity is a vector quantity. This makes it a conserved quantity in closed systems, which leads us into the principle of conservation of momentum and its applications in problem solving.
Inelastic Collision
In an inelastic collision, two objects collide and move together as a single system after the event, unlike elastic collisions where they would bounce off each other. This type of collision includes factors such as deformation and the generation of heat, and kinetic energy is not conserved. However, momentum is conserved.
To visualize this, imagine our midair falcon-dove scenario. Upon catching the dove, the falcon combines its mass with that of the dove, and they move with a shared velocity post-impact. The inelastic collision formula, in this case, is:
\[ p_{initial} = p_{final} \]
where \( p_{initial} \) is the sum of the falcon's and dove's momenta before the collision and \( p_{final} \) is their combined momentum afterwards. By setting the initial and final momenta equal, we can solve for the unknown final common velocity, leveraging the conservation of momentum principle. Understanding inelastic collisions is crucial in several real-world situations, such as traffic accident reconstructions and sports physics.
Physics Problem Solving
Physics problem solving is a systematic approach that involves understanding the scenario, applying relevant principles, and executing mathematical calculations to find a solution. A step-by-step method allows breaking down complex problems into manageable parts, making them easier to solve. Let's illustrate this with our falcon and dove collision problem:
  • Identify the system and isolate it from external forces. In our example, the system is the falcon and the dove.
  • Understand the physical principles at play. Here, it's the conservation of momentum.
  • Create equations based on these principles. We use momentum calculation here for both initial and final states.
  • Perform the calculations by plugging in the known values to find the unknowns. As the final step, solve the equations to find the velocity after impact.
Problem-solving in physics also involves making assumptions to simplify the scenario, such as neglecting air resistance in the falcon-dove problem. Teaching students to approach problems in a structured way leads to better understanding and enhances their analytical skills.

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