grade 4 , con 5, lesson 3&4

A ball at the top of a hill stores ..........energy.

• sound

• light

• chemical

• potential

All the following examples store chemical energy, except.............

• food.

• natural gas.

• a battery.

• a compressed spring.

The stored energy in a battery of a flashlight changes into ............when it is turned on.

• chemical energy

• sound energy

• light energy

• potential energy

Energy can do all the following, except.............

• It can be stored in an object.

• It can be transferred from an object to another one.

• It can be transformed from one form into another one.

• It can be destroyed and cannot be created

If an object stops at a certain height from the Earth's surface for two hours then falls down, this means that...............

• its potential energy will be destroyed before two hours.

• its kinetic energy will be destroyed after two hours.

• its stored potential energy will change into kinetic energy.

• its stored kinetic energy will change into potential energy.

All the following examples have stored potential energy, except.............

• a stopped roller coaster at the top of a hill.

• a moving car on a flat road.

• a battery of a car.

• a compressed spring of a toy.

All the following examples represent kinetic energy, except.........

• light waves moving through the air.

• sound waves moving through the air.

• stored chemical energy in a car battery.

• water particles movement during heating.

The potential energy of an object depends on..............

• its mass only.

• its height from the Earth's surface only.

• its mass and its height from the Earth's surface.

• its temperature

All the following are forms of kinetic energy, except.............

• light energy.

• chemical energy.

• sound energy.

• electrical energy.

All types of energy can be classified into two main groups which are...............

• light energy and sound energy.

• chemical energy and electrical energy.

• potential energy and kinetic energy.

• magnetic energy and thermal energy.