Repaso de ciencias - Energy, Matter, Water Cycle

Which of these devices is the only one NOT designed to produce both sound and light energy?

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Which object requires only mechanical energy to perform its main function?

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Which object requires only thermal energy to perform its main function?

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Wagons can be used to carry people or objects. Which of the following is NOT an example of the wagon using mechanical energy?

• The wheels turn as the wagon moves.

• The wagon moves forward as it is pulled.

• The wagon handle lifts up when it is grabbed.

• The wagon gets warm as it sits in sunlight.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Students drop the same heavy ball onto identical blocks of soft clay from different heights. For each height they measure the depth of the dent the ball makes in the clay. Why is the depth of the dent different in each trial?

• The size of the ball changes.

• The material of the ball changes.

• The mass of the ball when it hits the clay changes.

• The force of the ball when it hits the clay changes.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS3-1

NGSS.MS-PS3-5

A student is given a mixture of sand and iron filings. Which of the ways listed on the table would be the best way to separate the mixture?

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For an investigation a teacher dropped a bolt into a container of water and asked students to remove it without touching the water. The students first tried to use a strong magnet to remove the bolt, but the magnet did not cause the bolt to move. They finally poured the water into another container to get the bolt out. Which of these best describes some of the bolt's physical properties?

• The bolt is magnetic and has the same density as the water.

• The bolt is nonmagnetic and more dense than the water.

• The bolt is nonmagnetic and less dense than the water.

• The bolt is magnetic and less dense than the water.

Tags

NGSS.MS-PS1-2

A student puts four objects in a bucket filled with water. The objects are listed below.

Which two objects are most likely less dense than the water?

• wood block and metal paper clip

• plastic ball and glass marble

• metal paper clip and glass marble

• wood block and plastic ball

Tags

NGSS.MS-PS1-2

The table lists some properties of four different samples of matter. Which sample could be glass?

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A student uses a spring scale to pull a 50-gram block horizontally across a wood desk. Then the student pulls the block the same distance across surfaces of carpet, sandpaper, and glass. Which question is this investigation most likely designed to answer?

• How do blocks at different sizes react to force?

• How do different surfaces affect the amount of force needed to move a block?

• How do blocks affect spring scales?

• How does the mass of a block change when it's pulled across a desk?

Tags

NGSS.MS-PS2-2