Big Idea 11: Energy Transformation

Which two main forms of energy are given off when an electric lamp is switched on?

• The lamp converts the electrical energy into light and heat energy.

• The lamp converts the electrical energy into mechanical and sound energy.

• The lamp converts the electrical energy into heat and sound energy.

• The lamp converts the electrical energy into light and mechanical energy.

A student left a crayon outside in the Sun on a very hot day. He saw that it had melted into a liquid. Which of the following best explains why the crayon melted?

• The crayon released all its energy to the Sun.

• The friction with the air caused the crayon to melt.

• The crayon absorbed heat energy from the Sun and melted.

• The light energy from the Sun dissolved the crayon.

Tags

NGSS.MS-PS1-4

You are camping with your family. You spent time researching how to make fire using a magnifying glass, some wood kindling, and the Sun. Which of the following explains why you can use sunlight to make a fire?

• The heat energy from the Sun is focused through the magnifying glass, changing it to chemical energy and lighting the kindling.

• The light energy from the Sun is concentrated through the magnifying glass, and is transformed to heat energy that lights the kindling

• The chemical energy from the Sun is focused through the magnifying glass, and burns the kindling.

• The electrical energy from the Sun is concentrated through the magnifying glass, allowing the heat energy to burn the kindling.

A student puts a bowl of water near a window on a sunny afternoon. After some time, the water becomes warm. Which of the following energy changes makes the water warm?

• The light energy from the Sun hits the bowl, creating heat energy which heats the water.

• The electrical energy from the Sun hits the bowl, creating chemical energy which heats the water.

• The chemical energy from the Sun hits the bowl, creating light energy which heats the water.

• The heat energy from the Sun hits the bowl, creating chemical energy that heats the water.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The sun is very far away from Earth. How does the heat from the sun reach Earth?

• Gas waves from the Sun travel through space. This chemical energy transforms to heat when it hits Earth.

• Light waves from the Sun travel through space. This light energy transforms to heat when it hits Earth.

• Wind from the Sun travels through space. This mechanical energy transforms to heat when it hits Earth.

• Electrical waves from the Sun travel through space. This electrical energy transforms to heat when it hits Earth.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

How is friction different between rough surfaces and smooth surfaces?

• Rough surfaces create more friction with other surfaces than smooth surfaces.

• Smooth surfaces create more friction with other surfaces than rough surfaces.

• Rough surfaces decrease friction between surfaces and smooth surfaces increase friction between surfaces.

• There is no difference between the friction on rough or smooth surfaces.

What two types of energy could result from friction?

• light energy and electrical energy

• mechanical energy and sound

• sound energy and heat energy

• mechanical energy and electrical energy

Which situation would have the least amount of friction?

• a ball rolling across a carpet

• a car driving down a dirt road

• a wagon going down a grassy hill

• a sled being pushed on an icy pond

Why do car brakes feel hot after they have been used?

• The sun makes them hot.

• Car brakes use friction to stop a car, which creates heat.

• The brakes get hot from the wheel spinning fast.

• The heat from the car engine make the brakes get hot.

Tags

NGSS.MS-PS3-5

Why is ice slippery?

• Ice is smooth and increases the friction between your shoes and the ice.

• Ice is smooth and decreases the friction between your shoes and the ice.

• Ice is smooth and your shoes are soft so they slip.

• Ice is smooth and your shoes are repelled by the ice.

Tags

NGSS.MS-PS2-2