What is the Law of Conservation of Energy?
Energy can’t be created or destroyed; it can only be converted or transferred from one form to another
The total amount of energy always remains the same.
Define energy.
The ability to do work or cause change
Energy is a fundamental concept in physics.
Define work.
The transfer of energy from one object to another
Work occurs when a force makes an object move in the direction of the force.
What is power?
The rate at which energy is transferred
Power is measured in watts.
What are the two types of mechanical energy?
- Kinetic Energy
- Potential Energy
Mechanical energy is associated with the motion, position, or shape of an object.
What type of energy is acquired by an object when work is done on it?
Mechanical energy
The energy acquired is known as mechanical energy.
What are the different forms of energy?
- Mechanical Energy
- Thermal (Heat) Energy
- Chemical Energy
- Electrical Energy
- Electromagnetic Energy
- Nuclear Energy
Each form of energy has unique characteristics and applications.
What is gravitational potential energy?
Energy due to the gravitational forces between objects
Depends on mass, gravity, and height.
What is the equation for gravitational potential energy?
GPE = mass (kg) × gravity (N/kg) × height (m)
GPE is influenced by the object’s mass and height above a reference level.
What is kinetic energy?
The energy of motion
All moving objects possess kinetic energy.
What factors affect kinetic energy?
- Mass of the object
- Speed of the object
Kinetic energy depends on both mass and speed.
What is the equation for kinetic energy?
KE = 1/2 mass (kg) × speed (m/s)²
Kinetic energy increases with the square of the speed.
What is elastic potential energy?
Potential energy stored in an object that is stretched or compressed
Examples include stretching a rubber band or drawing a bow.
What is the relationship between potential energy and kinetic energy?
Potential energy can be transformed into kinetic energy and vice versa
This relationship is fundamental in understanding energy conservation.
What type of energy cooks food in a microwave oven?
Electromagnetic Energy
This energy is used to heat food.
When electrical energy is transformed into mechanical energy, what device is typically involved?
Electric fan
The fan converts electrical energy to mechanical energy to create airflow.
What is the unit for work?
Joule (J)
Work is calculated as force multiplied by distance.
What is the formula for power?
Power (in watts) = Energy / Time
Power indicates how quickly energy is converted.
True or false: Energy can be created or destroyed.
FALSE
Energy can only be transformed from one form to another.
What energy transformation occurs when an electric lamp is turned on?
Electrical Energy to Electromagnetic Energy
This transformation produces light.
