The distance-time graph shows the motion of a car. Which two spots show the car at rest?

• Between 2-4 min

• Between 4-6 min

• Between 6-8 min

• Between 8-10 min

Tags

NGSS.MS-PS3-1

The graph above shows the speed at which a cyclist traveled for every hour in a 4 hour ride. What direction is the cyclist moving from 0-2 hours?

• A. Away from the starting point

• B. Toward the starting point

• C. The cyclist is not moving

• D. There is not enough information to determine the cyclist's direction of movement.

Tags

NGSS.MS-PS3-1

Which is the fastest segment of Kara's trip?

• between hour 1 and 2

• between hour 2 and 3

• between hour 3 and 4

• between hour 4 and 5

Tags

NGSS.MS-PS3-1

A volcanic eruption launches thousands of rocks into the air. The rocks will travel different distances due to their different masses, but ultimately all of the rocks will return to the ground. Which of the following explains why that is?

• The rocks do not have any forces acting on them except for the explosive force of the volcano. As a result, the rock's own inertia causes them to return to the ground.

• The moment the rocks are launched into the air there is an unbalanced force of gravity acting on them. That force continually acts on the rocks until they stop moving when they hit ground and the forces are balanced again.

• The moment the rocks are launched they hit other rocks. Those other rocks introduce unbalanced forces that ultimately cause the rocks to fall back to the ground.

• The only rocks that hit the Earth are the ones that have a downward force applied to them by the explosion. Any rocks that have an upward force applied to them continue in that direction and end up in the Earth's atmosphere.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

According to Newton’s First Law (the Law of Inertia)—

• when you lean back against a chair, the chair pushes back against your back.

• when you kick a soccer ball, the ball pushes back against your foot.

• when you push a shopping cart that is still, it rolls forward.

• when you hit a baseball, the bat can vibrate and hurt your hands.

Which of the following best illustrates an application of Newton’s First Law (also called the Law of Inertia)?

• A. A passenger not wearing a seatbelt is ejected from an automobile during a severe crash.

• B. Dinner plates remain on a table when a slick tablecloth is pulled out from underneath them.

• C. An ice hockey puck continues sliding across the relatively frictionless ice until it comes into contact with a wall or a player’s stick.

• D. All of these are examples of Newton’s First Law.

Students in a physics class measured the speed of a steel ball as it rolled down a long ramp. The graph shown is a record of their measurements. What does the graph tell you about the speed of the steel ball?

• The ball moved down the ramp at a constant speed.

• The ball started out fast, then slowed down, and then increased its speed again.

• The ball did not move.

• The ball started slowly and then began to move faster down the ramp.

Tags

NGSS.MS-PS3-1

How are speed and velocity different?

• Speed includes direction

• Speed indicates momentum

• Velocity includes momentum

• Velocity includes direction

This question has two parts. First, answer Part A. Then answer Part B. Part A Two students created the table displayed below: Which of the following statements accurately describes the information in the table?

• A. Student A listed an example of acceleration, and Student B listed an example of speed.

• B. Both Student A and Student B listed examples of velocity.

• C. Student A listed an example of speed, and Student B listed an example of velocity.

• D. Student A listed an example of velocity, and Student B listed an example of speed.

Which of the following BEST supports the answer to Part A?

• Speed always includes a direction, while velocity only includes a distance and a time.

• Speed only tells a distance and a time, but velocity takes the speed and adds a direction.

• Acceleration takes the speed of an object and adds the direction associated with the motion.