Work, Energy, Power

Front

What is Work?

Back

Work is done when a force causes an object to move in the direction of the force. It is calculated as Work = Force x Distance.

Front

What is Energy?

Back

Energy is the ability to do work. It exists in various forms, including kinetic energy, potential energy, thermal energy, etc.

Front

What is Kinetic Energy?

Back

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

Front

What is Potential Energy?

Back

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

Front

How is Work related to Energy?

Back

Work is a transfer of energy. When work is done on an object, energy is transferred to that object.

Front

What is Power?

Back

Power is the rate at which work is done or energy is transferred, calculated as Power = Work / Time.

Front

What is the formula for calculating Work?

Back

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

Front

What happens to the potential energy of an object as it falls?

Back

As an object falls, its potential energy decreases while its kinetic energy increases, conserving the total mechanical energy.

Front

If a 1.2 kg book is lifted 5 meters, how much work is done?

Back

60 J (calculated using Work = mgh = 1.2 kg * 9.8 m/s² * 5 m).

Front

What is the average power if 100,000 J of energy is used in 20 seconds?

Back

5,000 W (calculated using Power = Work / Time = 100,000 J / 20 s).