Energy & Work

Front

What is the definition of work in physics?

Back

Work is defined as the product of the force applied to an object and the displacement of that object in the direction of the force. Mathematically, it is expressed as Work = Force × Displacement.

Front

What is the unit of work?

Back

The unit of work is the joule (J), which is equivalent to one newton meter (Nm).

Front

What does it mean when work done is zero?

Back

Work done is zero when the displacement of the object is zero or when the force is applied at a right angle to the direction of displacement.

Front

What is the relationship between energy and work?

Back

Energy is the capacity to do work. When work is done on an object, energy is transferred to that object.

Front

What is kinetic energy?

Back

Front

What is potential energy?

Back

Potential energy is the energy stored in an object due to its position or configuration. For example, gravitational potential energy is given by the formula: Potential Energy = mgh, where m is mass, g is the acceleration due to gravity, and h is height.

Front

What is the principle of conservation of energy?

Back

The principle 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 calculating work done?

Back

The formula for calculating work done is Work = Force × Displacement × cos(θ), where θ is the angle between the force and the direction of displacement.

Front

What is the difference between positive work and negative work?

Back

Positive work is done when the force and displacement are in the same direction, while negative work is done when the force and displacement are in opposite directions.

Front

What is mechanical energy?

Back

Mechanical energy is the sum of kinetic energy and potential energy in a system. It is the energy associated with the motion and position of an object.