Energy Conversion and Types

Energy

• The unit of energy is Joule (J).
• Mechanical energy is a form of kinetic energy.
• Power is calculated using the formula P = E / t.
• The unit of power is Watt (W).

Energy Conversions

• A light bulb converts electrical energy into light energy.
• A generator converts mechanical energy into electrical energy.

Types of Energy

• Thermal energy is a form of kinetic energy.
• Electrical energy is a form of energy.
• Chemical energy is a form of energy.
• Gravitational energy is a form of potential energy.

Efficiency

• The efficiency of a machine is calculated using the formula Output energy / Input energy.

Kinetic Energy

• The formula for kinetic energy is K = 1/2 mv^2.

Renewable Energy

• Solar energy is a form of renewable energy.

Friction

• Friction is the force that opposes motion between two surfaces in contact.
• Static friction occurs when an object is stationary.
• Rolling friction occurs when an object is rolling.
• The coefficient of friction is the ratio of frictional force to normal force.
• The frictional force is calculated using the formula F = μN.
• The frictional force is affected by normal force, surface area, and temperature.
• Lubricants decrease friction.

Forces

• Friction is the force that opposes the motion of an object, distinct from thrust, drag, and gravity.