Learning at Home

The flow of electricity in circuits requires a complete path. Look closely at the electric circuit below. What is wrong with the diagram?

• The light bulb cannot light because the circuit is not complete.

• There is no power source for the circuit.

• The wires are cut and therefore are not connected correctly.

• Paper clips cannot be used to conduct electricity.

The diagram below shows a series circuit with three lit bulbs. How many of the bulbs will remain lit if the wire is cut at the point shown by the arrow?

• 0

• 1

• 2

• 3

All of the following are examples demonstrating mechanical energy except -

• a fire roasting marshmallows.

• a girl kicking a ball across the yard.

• a fan blowing out air.

• a boy writing with a pen.

Which two forms of energy are most commonly used to cook food in an oven?

• light and mechanical

• thermal and sound

• electrical and sound

• electrical and thermal

When you hear music, what is your ear actually detecting?

• notes from the speaker

• electrical currents traveling through the air

• waves created by vibrations

• sound atoms coming from the sound

A student launches a paper plane during a science investigation. Which type of energy is observed as the paper plane flies?

• light

• electrical

• thermal

• mechanical

A student used a bent straw to look at a candle. When he looked through the straw, he could not see the candle. Which statement describes why he couldn't see the candle?

• Light travels in all directions.

• Light can travel around corners.

• Light travels in a straight line.

• Light cannot travel through a straw.

Which of these materials is most likely opaque?

• a block of wood because it blocks all light.

• a glass window because it lets all light pass through.

• tissue paper because it lets some light pass through and blocks some light.

• none of these materials are opaque.

Below is a picture of a girl and her shadow. A shadow is created when -

• light bends around an object.

• an object blocks the light coming from a light source.

• the light from a light source passes through an object.

• an object is transparent.

A cold front is expected next week

• weather

• climate