4a._work_energy_power (1)

What is the definition of work in physics?

Work is the application of force over a distance; mathematically defined as W = Fd.

Energy cannot be created or destroyed, it can only be __________.

changed from one form to another.

What is the unit of work?

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

How is kinetic energy defined?

Kinetic energy (K) is defined as K = (1/2)mv², where m is mass and v is velocity.

What does the Law of Conservation of Energy state?

Energy cannot just appear out of nowhere, nor can it disappear; it must always change from one form to another in a closed system.

What is the formula for work done at an angle?

W = Fd cos(θ), where θ is the angle between the force and the direction of motion.

What happens when a force is applied perpendicular to the direction of motion?

It does zero work.

What is gravitational potential energy?

Gravitational potential energy (Ug) is the energy stored by an object due to its position in a gravitational field, calculated as Ug = mgh.

How is power defined in physics?

Power is defined as the rate at which work is done or energy is transferred, with the unit watt (W), which is equal to joules per second (J/s).

According to the Work-Energy Theorem, how does a system gain or lose energy?

A system gains or loses kinetic energy by transferring it through work between the environment and the system.