4a._work_energy_power (1).pdf

What is the definition of energy according to the Law of Conservation of Energy?

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

Fill in the blank: The unit for work is the newton-meter (N·m), renamed as __________ and abbreviated as J.

joule

What is the formula for calculating work when a constant force acts on an object?

W = Fd, where W is work, F is force, and d is distance.

True or False: Work is a vector quantity.

False; work is a scalar quantity.

When does a force do zero work?

When the force is applied perpendicular to the direction of motion.

What is kinetic energy defined as?

The energy an object possesses by virtue of its motion, given by the formula K = mv².

State the Work-Energy Theorem.

A system gains or loses kinetic energy by transferring it through work.

What is gravitational potential energy, and how is it calculated?

Gravitational potential energy (U) is calculated as U = mgh, where m is mass, g is the acceleration due to gravity, and h is height above a reference level.

What is power, and what is its formula?

Power is the rate at which work is done, given by P = W/t, where W is work and t is time.

Fill in the blank: Mechanical energy is conserved in a system when there are no __________ forces acting on the system.

nonconservative