Mr. Hays Category 2 STAAR Review

Two students are working together to build a birdhouse. Student 1 applies a force of 10 N to a wooden board in order to slide it across the table to Student 2. If the force of friction resisting the student's push is 4 N, what is the net force acting on the board?

• 4 N

• 6 N

• 10 N

• 14 N

Tags

NGSS.MS-PS2-2

"DEEP SPACE 1" was a spacecraft powered by an engine that gave off xenon particles to change velocity. It had a mass of 500 kg. Which expression can be used to find the spacecraft's acceleration if its engine created a net force of

0.10 N?

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Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

The masses of four vehicles and the net forces acting on them as they enter a highway are recorded in the table. Which vehicle has the greatest acceleration as it enter the highway?

• sedan

• coupe

• SUV

• truck

Tags

NGSS.MS-PS2-2

During a demonstration of Newton's laws of motion, a student used the setup shown in Figure 1. The student flicked the index card with a fingertip, and the coin fell straight down into a plastic cup as shown in Figure 2. Which of these best explains why the coin fell straight down into the cup instead of remaining on the index card?

• The coin was at rest until the card was removed, so it tended to remain in the same location. Once the card was gone, the unbalanced force of gravity caused the coin to fall.

• Moving the card applied an action force on the coin. Since the card was gone, gravity applied a reaction force on the coin.

• The card had less mass than the coin, so a smaller force of gravity acted on the card. The larger force of gravity on the coin made it fall.

• The acceleration of the coin falling into the cup was equal and opposite to the acceleration of the card.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-4

The three vehicles shown below are all traveling at a speed of 15 m/s, but only the pickup truck has a changing velocity. The pickup truck has a changing velocity because the pickup truck...

• can accelerate faster than the other two vehicles

• is traveling in the opposite direction from the other two vehicles

• is traveling on a curve in the road

• needs a large amount of force to move

Tags

NGSS.MS-PS2-2

What is the difference between the velocity and the speed of an object?

• velocity is the change in distance over time, while speed is the change in velocity over time.

• velocity has a direction associated with it, while speed has no specific direction.

• velocity has no direction associated with it, while speed has a specific direction.

• velocity is the change in speed over time, while speed is the change in distance over time.

Four students were asked to classify the activities of the people in the picture below as examples of either potential or kinetic energy. Which student correctly classified the activities?

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Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-2

NGSS.MS-PS3-4

A marble is given potential energy by being placed at Location W. When the marble is released, it rolls down the track. At which location does the marble have maximum kinetic energy?

• Location W

• Location X

• Location Y

• Location Z

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

A student kicks a soccer ball three times. Another student records the distance, the amount of time the ball travels, and the average speed in the table shown below. How many seconds did it take for the ball to travel 30 m during Kick 3?

• 0.5 s

• 1.0 s

• 1.5 s

• 2.0 s

Tags

NGSS.MS-PS3-1

A bus travels 20 km in 30 minutes. What is the average speed of the bus?

• 20 km/h

• 30 km/h

• 40 km/h

• 50 km/h