Which concept is defined as the ability to do work or cause change?

Which concept is defined as the ability to do work or cause change?

• A. Energy
• B. Momentum
• C. Velocity
• D. Mass

Answer: (A)

Energy is the ability to do work or cause change. Work happens when a force moves something over a distance, and energy is what enables that motion or change to occur. Energy comes in many forms, like kinetic energy from motion, potential energy stored due to position, or chemical energy stored in food and fuels. It can be transformed from one form to another—throw a ball and potential energy becomes kinetic energy, a light bulb turns electrical energy into light and heat, and plants store energy chemically for growth. In a closed system, the total amount of energy stays the same even though its form changes. Momentum describes how much motion an object has (mass times velocity), not the general ability to do work. Velocity is speed with a direction, and mass is how much matter something contains. These ideas relate to motion and quantity of matter, rather than the capacity to cause change, which is what energy captures.

Energy is the ability to do work or cause change. Work happens when a force moves something over a distance, and energy is what enables that motion or change to occur. Energy comes in many forms, like kinetic energy from motion, potential energy stored due to position, or chemical energy stored in food and fuels. It can be transformed from one form to another—throw a ball and potential energy becomes kinetic energy, a light bulb turns electrical energy into light and heat, and plants store energy chemically for growth. In a closed system, the total amount of energy stays the same even though its form changes.

Momentum describes how much motion an object has (mass times velocity), not the general ability to do work. Velocity is speed with a direction, and mass is how much matter something contains. These ideas relate to motion and quantity of matter, rather than the capacity to cause change, which is what energy captures.