Energy and Work - JSS2 Basic technology Past Questions and Answers - page 2
When lifting a weight from the ground to a certain height, which type of energy is primarily involved?
Kinetic energy
Gravitational potential energy
Thermal energy
Electrical energy
What type of energy transformation occurs when boiling water in an electric kettle?
Chemical to thermal energy
Electrical to thermal energy
Kinetic to potential energy
Thermal to chemical energy
In the context of energy, what does the Law of Conservation of Energy state?
Energy cannot be created or destroyed
Energy can be created from nothing
Energy is always concerted to heat
Energy is never transferred
Which device demonstrates the conversion of chemical energy to electrical energy?
Light bulb
Battery
Wind turbine
Hydrometer
In the formula for work ( W = Fd ) what does "d" represent?
The angle between the force and the displacement
The distance over which the force is applied
The force applied
The displacement of the object
What is energy?
Energy is defined as the ability to do work or cause change. It exists in various forms such as kinetic, potential, thermal, chemical, electrical, and nuclear energy. Energy can be transferred or converted from one form to another but cannot be created or destroyed, according to the Law of Conservation of Energy. This fundamental concept is crucial in understanding how different processes and systems function in physics and everyday life.
Gravitational potential energy is given by which formula?
The formula for gravitational potential energy is (PE = mgh) where ( m ) stands for mass, ( g ) is the acceleration due to gravity, and ( h ) represents the height above a reference point. This energy form is related to the position of an object in a gravitational field. When an object is raised to a higher position, its gravitational potential energy increases. This energy can be converted into kinetic energy if the object is allowed to fall.
Work is done when:
Work is done when a force causes an object to move in the direction of the force applied. The formula for work is ( W = Fd ), where ( W ) is work, ( F ) is the applied force, ( d ) is the distance. Work involves the transfer of energy to or from an object, resulting in a change in its motion or state. If no movement occurs despite the application of force, no work is done.
How are energy and work related?
Energy and work are closely related concepts in physics. Work is the process of transferring energy from one object or system to another by applying a force over a distance. When work is done on an object, it gains energy; similarly, when an object does work, it loses energy. For example, lifting a weight transfers energy to the weight in the form of gravitational potential energy. This relationship highlights that work is a means of transferring energy.
In the context of energy, what does the Law of Conservation of Energy state?
The Law of Conservation of Energy states that energy cannot be created or destroyed, only transferred or converted from one form to another. This principle means that the total energy in a closed system remains constant over time. For instance, when a pendulum swings, its energy continuously converts between kinetic energy and potential energy, but the total energy remains unchanged. This law is fundamental in understanding energy interactions and transformations in physical systems.