4a._work_energy_power.pdf

What is the Law of Conservation of Energy?

Energy cannot be created or destroyed; it can only change from one form to another.

What is work defined as in physics?

Work is the application of force over a distance.

What is the unit of work?

The unit of work is the joule (J), equivalent to a newton-meter (N·m).

How is work calculated when force is applied at an angle?

W = Fd cos θ.

What is kinetic energy?

Kinetic energy (K) is the energy an object has due to its motion, defined as K = 1/2 mv².

What is potential energy?

Potential energy is the energy stored in an object due to its position or configuration.

What is the formula for gravitational potential energy?

Ug = mgh, where m is mass, g is acceleration due to gravity, and h is height.

What is power?

Power is the rate at which work is done or energy is transferred, measured in watts (W).

Define work done by a variable force.

Work done by a variable force is given by the area under the curve of a force-versus-displacement graph.

What does positive work do to an object's energy?

Positive work increases the kinetic energy of an object.

What is the work-energy theorem?

The work-energy theorem states that the work done on an object is equal to the change in its kinetic energy.

Why is potential energy important?

Potential energy is important when it changes from one point to another, converting to other energy forms like kinetic energy.

What signifies a conservative force?

A conservative force does not depend on the path taken when moving an object between two points.

How do nonconservative forces affect energy?

Nonconservative forces dissipate energy as heat and work done by them is path-dependent.

What is the equation for total mechanical energy?

Total mechanical energy is E = K + U, where K is kinetic energy and U is potential energy.

What is the significance of zero work?

Zero work occurs when a force is applied perpendicular to the direction of motion.