Natural Science Term 3

Being able to work well with minimum waste.

Efficiency

Energy stored in particles of substances.

Chemical potential energy

Describes the energy before any interactions occur in the system.

Input

Investigation when you collect information from people or groups of people.

Survey

A large vertical steel tower which supports electrical power cables.

Pylon

The water in the dam on the left is high up. It has the ability to fall down. What kind of

energy does the water have?

Gravitational potential energy

As the water flows down the outlet from the dam, describe the transfer of energy.

Gravitational potential energy to kinetic energy.

The flowing water then turns the turbine. What energy does the turbine have?

Kinetic energy

The generator then transfers the energy between two systems. Name them.

Mechanical system and electrical system

Ability to do work.

Energy

Transfer of heat energy between solid objects that are touching.

Conduction

Fuels or substances formed in the Earth from dead plant and animal remains.

Fossil fuels

Energy an object has due to movement.

Heat

Transfer of heat by electromagnetic waves.

Radiant energy

Briefly explain the Law of Conservation of energy.

Energy cannot be created. Energy cannot be destroyed. Energy can be transferred from

one system to another.

Explain why a water reservoir that is built on a higher level gives the water in it more

potential energy.

It is so that gravity can pull the water out √ without having to use pumps , makes the

water pressure stronger.

Rainwater naturally flows downhill. Therefore, dams are built in valleys downstream.

Explain how the water gets from the dam (downstream) to a town

(upstream)?

Water in reservoirs that are positioned lower than the houses, or water from boreholes

and wells has to be pumped up to the houses. This is because the water below the level of

the houses does not have enough potential energy to reach the houses.

Identify instances in which people in your community make use of potential energy

to meet their needs?

Reservoirs that are built higher up.

Thermal energy is energy produced by

Heat

State whether the following images are examples of CONDUCTION, CONVECTION OR

RADIATION

Radiation

State whether the following images are examples of CONDUCTION, CONVECTION OR

RADIATION

Conduction

State whether the following images are examples of CONDUCTION, CONVECTION OR

RADIATION

Convection

State whether the following statements are TRUE or FALSE. Humans are warm-blooded organisms.

True

State whether the following statements are TRUE or FALSE. Mammals are not able to maintain a constant body temperature.

False

State whether the following statements are TRUE or FALSE. Animals have their own method of insulation.

True

State whether the following statements are TRUE or FALSE. Birds are covered in wool to keep them warm.

False

State whether the following statements are TRUE or FALSE. Humans also use coverings like blankets for further insulation.

True