Physical Science

Two bar magnets are held close together. They are released and allowed to move freely. The bar magnets quickly come together. Which best explains why this happens?

• The poles facing one another are both south poles

• The poles facing one another are both north poles

• The poles facing one another are opposite poles

• One magnet was bigger than the other

Static electricity is the buildup of charges between two objects. What best explains why a balloon is attracted to hair when the two have been rubbed together?

• The balloon and hair both have positive charges

• The balloon and the hair both have negative charges

• The balloon and the hair both have neutral charges

• The balloon and the hair both have opposite charges

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Which of the two below result in an attractive force?

• A positive charge and a negative charge

• Two negative charges

• Two south poles

• A north pole and a south pole

• Two postive charges

Tags

NGSS.MS-PS2-3

What property of the wave is represented by the letter "B"?

• amplitude

• crest

• trough

• wavelength

Tags

NGSS.MS-PS4-1

The highest point on a wave is:

• the crest

• the trough

• the top

• the coast 

Which wave in the diagram has the greatest frequency?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS4-1

Which wave in the diagram has the greatest wavelength?

• 1

• 2

• 3

• 4

What happens when light transitions into a new medium?

• Reflection

• Absorbing

• Refraction

• Mirror

Tags

NGSS.MS-PS4-2

A blue dish appears blue because it

• absorbs blue light

• absorbs white light

• reflects white light

• reflects blue light

What is this a picture of?

• Reflection

• Refraction