work and energy flashcard

Front

What is the formula for Gravitational Potential Energy?

Back

GPE = (m)(g)(h) where m is mass, g is acceleration due to gravity, and h is height.

Front

What type of energy transformation happens in a flashlight?

Back

Chemical energy transforms into light and heat energy.

Front

What are the units for Efficiency?

Back

Efficiency is expressed as a percentage (%).

Front

Calculate the efficiency of a lightbulb with total energy of 200J and useful energy of 20J.

Back

Efficiency = (Useful Energy / Total Energy) x 100 = (20J / 200J) x 100 = 10%.

Front

What is the efficiency of a machine with input of 263 J and output of 142 J?

Back

Efficiency = (Output / Input) x 100 = (142J / 263J) x 100 = 54%.

Front

Define Work in physics.

Back

Work is defined as the product of force and displacement in the direction of the force, W = F * d.

Front

What is Kinetic Energy and its formula?

Back

Kinetic Energy (KE) is the energy of an object in motion, given by the formula KE = (1/2)(m)(v^2), where m is mass and v is velocity.

Front

What is the Law of Conservation of Energy?

Back

The Law of Conservation of Energy states that energy cannot be created or destroyed, only transformed from one form to another.

Front

What is the formula for Mechanical Advantage (MA)?

Back

Mechanical Advantage (MA) = Output Force / Input Force.

Front

Explain the difference between Potential Energy and Kinetic Energy.

Back

Potential Energy is stored energy based on position, while Kinetic Energy is energy of motion.