Kinematics
A machine is a device that accepts energy in some available form and utilizes it to do a type of work. Energy, work, or power has to be transferred from one mechanical part to another to run a machine. While the transfer of energy between two machine parts, those two parts experience a relative motion with each other. Studying such relative motions is termed kinematics.
Kinetic Energy and Work-Energy Theorem
In physics, work is the product of the net force in direction of the displacement and the magnitude of this displacement or it can also be defined as the energy transfer of an object when it is moved for a distance due to the forces acting on it in the direction of displacement and perpendicular to the displacement which is called the normal force. Energy is the capacity of any object doing work. The SI unit of work is joule and energy is Joule. This principle follows the second law of Newton's law of motion where the net force causes the acceleration of an object. The force of gravity which is downward force and the normal force acting on an object which is perpendicular to the object are equal in magnitude but opposite to the direction, so while determining the net force, these two components cancel out. The net force is the horizontal component of the force and in our explanation, we consider everything as frictionless surface since friction should also be calculated while called the work-energy component of the object. The two most basics of energy classification are potential energy and kinetic energy. There are various kinds of kinetic energy like chemical, mechanical, thermal, nuclear, electrical, radiant energy, and so on. The work is done when there is a change in energy and it mainly depends on the application of force and movement of the object. Let us say how much work is needed to lift a 5kg ball 5m high. Work is mathematically represented as Force ×Displacement. So it will be 5kg times the gravitational constant on earth and the distance moved by the object. Wnet=Fnet times Displacement.
![**Physics Problem: Calculating Kinetic Energy**
**Problem Statement:**
A 7.0 kg bowling ball moves at 2.20 m/s. How fast must a 3.00 g Ping-Pong ball move so that the two balls have the same kinetic energy?
\(\_\_\_\_\_\_\_\_\_\_\_\_ \text{m/s}\)
**Explanation:**
To solve this problem, we need to understand the concept of kinetic energy, which is given by the formula:
\[ KE = \frac{1}{2}mv^2 \]
where \( m \) is the mass of the object and \( v \) is the velocity of the object.
1. **Calculate the kinetic energy of the bowling ball:**
- Mass of bowling ball, \( m_1 = 7.0 \) kg
- Velocity of bowling ball, \( v_1 = 2.20 \) m/s
- Kinetic energy of bowling ball \( (KE_1) \) is:
\[ KE_1 = \frac{1}{2} \times 7.0 \times (2.20)^2 \]
2. **Calculate the velocity required for the Ping-Pong ball:**
- Mass of Ping-Pong ball, \( m_2 = 3.00 \) g = 0.003 kg (convert grams to kilograms)
- Let velocity of Ping-Pong ball be \( v_2 \)
- We set the kinetic energy of the Ping-Pong ball equal to that of the bowling ball:
\[ \frac{1}{2} \times 0.003 \times v_2^2 = KE_1 \]
3. **Solve for \( v_2 \) to find the required velocity for the Ping-Pong ball.**
This fundamental exercise helps in understanding how kinetic energy is impacted by both mass and velocity and demonstrates the substantial speed needed for a lighter object to match the kinetic energy of a heavier, slower-moving one.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4905ce95-7924-42a2-8326-65214ca21e6d%2F045f73ae-26b4-42ee-b985-1833c16c3121%2Fxho7u8d_processed.jpeg&w=3840&q=75)
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