Open Sci Mkenna

If all the forces acting upon an object at rest are balanced, what will the object do?

• The object will speed up.

• The object will stay still.

• The object will slow down.

• The object will change directions.

Felipe and Marsha were studying forces and decided to do an experiment. They placed four equally sized blocks made of different materials on an elevated plastic tray. They watched each of the blocks move down the tray. Their setup is shown below. Which of the following conclusions can Felipe and Marsha make about the forces that cause the blocks to move down the tray?

• The force of friction is the same on each block.

• The force of friction causes the speed of each block to increase.

• The force of gravity causes all the blocks to move at the same speed.

• The force of gravity it greater than the force of friction on all the blocks.

Tags

NGSS.MS-PS2-2

Delilah followed this procedure for an investigation: 1. Collect five objects made of different types of metal. 2. Place them on a large laboratory table. 3. Touch each metal with a magnet and lift slowly. 4. Record observations. Which of the following is the testable question most likely being investigated by Delilah?

• What types of metal are attracted to magnets?

• What height can each magnet lift the metal to?

• Does the size of the magnet affect its level of attraction to an object?

• Does the mass of an object affect its level of attraction to a magnet?

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Dani adds 10 grams (g) of salt to a jar of water. She then adds 10 g of sand to a second jar of water. She covers and shakes both jars and sets them on the table for five minutes. The materials Dani uses are shown below. What should Dani expect to observe after those five minutes?

• Both the salt and the sand dissolved in the water.

• Both the salt and the sand settled to the bottom of the jar.

• The salt dissolved in the water, and the sand settled to the bottom of the jar.

• The salt settled to the bottom of the jar, and the sand dissolved in the water.

Tags

NGSS.MS-PS1-2

Frank uses a bowling ball to demonstrate how energy can cause changes. Which of the following actions would NOT demonstrate a change caused by Frank applying energy to the ball?

• He holds the bowling ball in both hands.

• He spins the bowling ball with one hand.

• He rolls the bowling ball across the floor.

• He lifts the bowling ball to place it on a shelf.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Bar magnets have a north pole (N) and a south pole (S). Latrisha places a bar magnet on three small straws so it can roll. Her setup is shown. Placing which of the following objects at point X will cause the bar magnet to move away from point X ?

• an iron nail

• an aluminum can

• the north end of another bar magnet

• the south end of another bar magnet

Tags

NGSS.3-PS2-3

David and Peter are moving a bookshelf across the thick carpet in their classroom. Even though they push as hard as they can, the bookshelf only moves a few inches at a time. Which of the following best explains what happens as they push the bookshelf?

• The force of gravity helps the motion of the bookshelf.

• The force of friction opposes the motion of the bookshelf.

• When they try to push the bookshelf, air resistance acts against them.

• When they push the bookshelf, the bookshelf pushes back with an equal and opposite force.

David and Peter decide to remove the books before pushing it any further across the thick carpet. How does removing the books most likely affect the movement of the bookcase?

• The mass increases, making the bookshelf easier to move.

• The gravity increases, making the bookshelf easier to move.

• The friction increases, making the bookshelf more difficult to move.

• The mass decreases, making the bookshelf easier to move.

Tags

NGSS.MS-PS2-2

Which of the following is a list of factors that affect the rate of dissolving?

• stirring, increasing temperature, particle size

• decreasing temperature, height of drop, straw size

• stirring, particle size, color

• only the substance can affect the rate of dissolving

Amy has new roller skates. She knows that if she stands very still on a flat part of the road with her roller skates on, she will not move. She has to give a push with her foot in order to start moving. What else would cause her roller skates to start rolling?

• setting the roller skates in the sun to warm up

• allowing a strong wind to blow against her back

• standing on one foot on the flat part of the road

• smoothing the surface on her roller skate wheels

Tags

NGSS.MS-PS2-2