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# Work and Energy in Physics

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@AccomplishedBixbite

### What is the definition of work in physics?

Force that causes an object to have a displacement

### What is required for work to be done on an object?

Both force and displacement are required

Kinetic energy

### What is the relationship between work and energy?

<p>Energy is the capacity to do work</p> Signup and view all the answers

### What type of energy does an object have due to its position?

<p>Potential energy</p> Signup and view all the answers

### What type of energy does a ball possess when placed on the top edge of an incline?

<p>Potential energy</p> Signup and view all the answers

### When is work considered to be done?

<p>When the force applied causes the object to move in the direction of the force</p> Signup and view all the answers

### What is the Work-Energy Theorem?

<p>A principle that relates the work done by all forces acting on an object to its change in kinetic energy</p> Signup and view all the answers

### What is the unit of work and energy in the standard metric system?

<p>Joule</p> Signup and view all the answers

### What is the correct equation for the Work-Energy Theorem?

<p>W = KEf - KEi</p> Signup and view all the answers

### What is the total work done as the object moves from point X to point Y?

<p>27 J</p> Signup and view all the answers

### What is the unit of the final answer in the first problem?

<p>Joules</p> Signup and view all the answers

### What happens to the kinetic energy of an object as it moves faster?

<p>It increases</p> Signup and view all the answers

### What is the purpose of converting the initial speed from miles per hour to meters per second?

<p>To ensure consistency in the calculation</p> Signup and view all the answers

### What can be inferred about the kinetic energy of a fast-moving object?

<p>It is higher than a slow-moving object</p> Signup and view all the answers

## Study Notes

### Work and Energy

• Work is done when a force causes an object to have a displacement, requiring a force, displacement, and cause.
• A force is a push or pull, while a displacement is a distance traveled by an object in a specific direction.
• When a force and displacement are parallel, work is done, and the object has kinetic energy (KE) or energy due to motion.

### Kinetic Energy (KE)

• Kinetic energy is the energy due to motion, and an object has kinetic energy when it moves as a result of forces acting on it.
• Examples of kinetic energy include a grocery cart moving down an aisle and a book being lifted from the floor.

### Potential Energy (PE)

• Potential energy is the energy due to an object's position, also called stored energy.
• An object has potential energy when it has the potential to do work, such as a ball placed on the top edge of an incline.
• When the ball is released, its potential energy is converted into kinetic energy, and work is done.

### Work-Energy Theorem

• The work-energy principle relates the work done by all forces acting on an object to its energy.
• The total amount of work done on an object is equal to the object's change in kinetic energy (final kinetic energy minus initial kinetic energy).
• This principle applies when multiple forces act on an object that changes its state of rest or motion.

### Work-Energy Theorem Equation

• The equation for the work-energy theorem is: W = ΔKE, where W is the work done, Δ is the change, and KE is the kinetic energy.
• This equation can be read as "the work done is equal to the change in kinetic energy."

### Units of Work and Energy

• The standard metric unit of work and energy is Joule (J), equivalent to one Newton (N) of force, causing a displacement of 1 meter (m).
• One Joule (1 J) is equal to one Newton meter (1 Nm).
• Another non-standard unit is foot-pound (ft.lb.).

### Work-Energy Theorem Examples

• A 2-kg object moves from a speed of 3 m/s to 6 m/s, and the total work done is 27 J.
• To stop a 2,000-kg truck moving at 60 mph, 718,240 J of energy is required.

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## Description

Learn about the concept of work in physics, including the requirements of force, displacement, and cause. Understand how work is done on an object with examples.

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