What is the principle of conservation of mechanical energy?

In a closed system, the total mechanical energy (kinetic + potential) remains constant if only conservative forces are acting.

What is the formula for calculating work done?

$$W = Fd \cos(\theta)$$ where W is work, F is force, d is displacement, and \theta is the angle between the force and displacement.

What is elastic potential energy?

Energy stored in an object when it is compressed or stretched, given by the formula $$PE_{elastic} = \frac{1}{2}kx^2$$ where k is the spring constant and x is the displacement.

What happens to kinetic energy as an object slows down?

Kinetic energy decreases as the object's speed decreases.

What is the difference between renewable and non-renewable energy sources?

Renewable energy sources can be replenished naturally (e.g., solar, wind), while non-renewable sources (e.g., fossil fuels) are finite.

How does friction affect work and energy?

Friction converts kinetic energy into thermal energy, reducing the total mechanical energy available for work.

Work, Power, Energy - Conceptual and Solving 2025 Flashcards

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15 questions

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1.

FLASHCARD QUESTION

Front

What is the formula for kinetic energy?

Back

$KE = \frac{1}{2}mv^2$ where KE is kinetic energy, m is mass, and v is velocity.

2.

FLASHCARD QUESTION

Front

As a ball rises in the air and reaches its highest point, most of the kinetic energy has been-

Back

transformed into potential energy.

3.

FLASHCARD QUESTION

Front

Energy stored in food, fuel, or batteries is an example of what type of potential energy?

Back

chemical potential energy.

4.

FLASHCARD QUESTION

Front

The Law of _______________ of energy states that energy cannot be created or destroyed.

Back

Conservation.

5.

FLASHCARD QUESTION

Front

At which point(s) on the roller coaster is the gravitational potential energy at its maximum?

Back

Point A.

6.

FLASHCARD QUESTION

Front

What is the formula for gravitational potential energy?

Back

$PE = mgh$ where PE is potential energy, m is mass, g is acceleration due to gravity, and h is height.

7.

FLASHCARD QUESTION

Front

What is the relationship between work and energy?

Back

Work done on an object is equal to the change in its energy.

8.

FLASHCARD QUESTION

Front

Define power in terms of work and time.

Back

Power is the rate at which work is done, given by the formula $P = \frac{W}{t}$ where P is power, W is work, and t is time.

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