Work and Energy in Physics
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Work and Energy in Physics

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Questions and Answers

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

What type of energy does an object have when it is moving?

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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