DCA Review #2 12-24

The diagram represents two students pushing and pulling an object in the same direction.

Which statement best describes the result of the forces?

• The object will not move because the forces are not the same.

• The object will move in the direction of the combined forces.

• The lesser force applied is not enough to move the object.

• The combined forces on the object cancels each other out.

Tags

NGSS.MS-PS2-2

A 55kg student was riding his skateboard to school. He traveled 200 meters in 40

seconds. What was the student’s average speed in meters per second?

A student walks 2 kilometers in 30 minutes. What is the student’s average speed in kilometers per hour?

A dog walks away from home at a constant pace for 20 minutes. Next, he stops for a 10 minute nap under a tree. Finally, he walks back home at a constant pace and comes to a stop.

Which graph below best represents the motion of the dog in terms of distance from home over time?

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A student wants to safely be able to move a cart up a ramp and onto a truck. To see which ramp would be most beneficial, the student investigates to see how the length of the ramp changes the amount of force needed to move the cart (measured in Newtons, N).

• As the height of the ramp increases, the amount of force needed increases.

• As the length of the ramp increases, the amount of force needed decreases.

• As the length of the ramp increases, the amount of force needed increases.

• As the height of the ramp increases, the amount of force needed decreases.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Three different sized inclined planes are shown.

Which inclined plane requires the most amount of force to move an object?

• A

• B

• C

• They all require the same amount of force.

Some students use an apple to represent the Earth. What is the best reason to use an apple for this comparison?

• The skin of an apple is very thin, and the crust of the Earth is very thin.

• The flesh of an apple is made of the same material all the way through, and the interior

  of the Earth is the same all the way through.

• The seeds of the apple are very light in comparison to the rest of the apple, and the

  core of the Earth is also made of very light matter.

• The stem of the apple comes from the core and the North Pole comes from the Earth’s

  core.

Your teacher has asked you to make a model of the interior of the Earth. In your model, how do the thicknesses of the lithosphere and crust compare?

• The lithosphere is thinner than the crust.

• The lithosphere is exactly the same thickness as the crust.

• The lithosphere is thicker than the crust.

• The lithosphere is thicker than the oceanic crust, but thinner than the continental crust.

Which layer in the image above contains the asthenosphere and part of the lithosphere?

• 1

• 2

• 3

• 4

A student made lemon drop candy by melting sugar, water, and lemon flavoring in a sauce pan until the mixture was at a very high temperature. Next, the student poured the clear yellow mixture onto a baking sheet until it was cool.

The process of making lemon drop candy is most like the formation of what type of rock?

• Igneous

• Metamorphic

• Sedimentary

• Conglomerate

Tags

NGSS.MS-PS1-4