Conservation of Energy

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 in a closed, isolated system.

Front

What is work in physics?

Back

Work is defined as the product of force and the distance over which it acts, and it is done when a force causes an object to move.

Front

How is power defined in physics?

Back

Power is the rate at which work is done or energy is transferred, calculated as work done divided by the time taken.

Front

What is the formula for calculating work?

Back

Work (W) = Force (F) × Distance (d) × cos(θ), where θ is the angle between the force and the direction of motion.

Front

What is the unit of work?

Back

The unit of work is the Joule (J), which is equivalent to one Newton meter (N·m).

Front

What is the unit of power?

Back

The unit of power is the Watt (W), which is equivalent to one Joule per second (J/s).

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How do you calculate power?

Back

Power (P) = Work (W) / Time (t).

Front

What is kinetic energy?

Back

Kinetic energy is the energy of an object due to its motion, calculated as KE = 1/2 mv², where m is mass and v is velocity.

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What is potential energy?

Back

Potential energy is the energy stored in an object due to its position or configuration, commonly gravitational potential energy calculated as PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Front

What is an isolated system?

Back

An isolated system is one that does not exchange matter or energy with its surroundings.